^ -V .f-v '■ ■■*^r;>'"?^^*V^^'>l''''''^V ^/^:?'-:^ DEPARTMENT OF THE INTERIOR [ITED STATES GEOLOGICAL SURVEY GEORGE OTIS SMITH, Dieectok WATER-StrppiiY Paper 373 WATER RESOURCES OF HAWAII 1913 BY G. K. LARRISON WASHINGTON GOVEKNMENT FEINTING OFFICE 1915 Pass Gr S 8 3 g; Book , H 4- ft S g . 10 DEPARTMENT OF THE INTERIOR UNITED STATES GEOLOGICAL SURVEY GEORGE OTIS SMITH, Dikectok Water- Supply Paper 373 WATER RESOURCES OF HAWAII 1913 c^ BY G. K. LARRISON WASHINGTON GOVERNMENT PRINTING OFFICE 19 15 C-y. ^ ^ D, of Do DEC 7 1915 LC Control Number tmp96 026353 So ^ CONTENTS. ^'^ Page. Authority for investigations 7 Cooperation 8 Scope of work 9 Field methods of measuring stream flow 9 Base data 9 Weir measurements 10 Velocity-area method 11 Definition of terms 15 Convenient equivalents 16 Office methods of computing and studying the discharge and run-off 17 Explanation of tables 20 Accuracy of field data and computed results 21 Division of work 22 Gaging stations maintained in Hawaii 22 Gaging-station records 27 Island of Kauai 27 Waimea River near Waimea 27 Kawaikoi Stream near Waimea 28 Waialae River near Waimea 29 Waimea ditch near Waimea 31 Makaweli River near Waimea 31 Halekua Stream near Waimea 32 Olokele ditch at tunnel No. 12 near Makaweli 33 Olokele ditch at weir near Makaweli 35 Poowaiomahaihai ditch near Waimea 36 Hanapepe River at Koula near Eleele 37 Hiloa ditch at Hanapepe Falls near Eleele 38 Hanapepe ditch at Koula near Eleele 40 Hanapepe ditch at weir near Hanapepe 41 Huleia River near LOiue 43 Hanamaulu River at Kapaia near Lihue 45 South Fork of Wailua River above Waiehu Falls near Lihue 46 Hanamaulu ditch near Lihue 48 Lihue ditch near Lihue 49 North Fork of Wailua River near Lihue 50 Kanaha ditch near Lihue 51 East Branch of North Fork of Wailua River near Lihue 53 Konohiki Stream at Makakualele weir (mauka) near Kealia 55 South Fork of Kaehulua Stream at Wainamunamu weir near Kealia. . 56 Kaehulua Stream at Kuhinoa weir near Kealia 57 North Fork of Kaehulua Stream at Kainahola weir, near Kealia 58 Kapaa River near Kealia 59 Akulikuli Spring near Kealia 60 Kapahi ditch at Kapahi, near Kealia 61 Kaneha ditch near Kealia 62 Anahola River above dam at Kiokala, near Kealia 63 3 4 CONTENTS. Gaging-station records — Continued. Island of Kauai — Continued. Page. Anahola ditch at Kiokala, near Kealia 64 KaliMwai River near Kilauea 65 Hanalei River near Hanalei 67 Kuna ditch near Hanalei 68 Wainiha River (east and west channels) near Wainiha 69 Miscellaneous measurements 73 Island of Oahu 74 Kalihi Stream at Kioi pool, near Honolulu 74 Nuuanu Stream at Luakaha weir, in upper Nuuanu Valley, near Honolulu 76 Nuuanu Stream below reservoir No. 2, wasteway, near Honolulu 75 Lulumaha ditch at upper Nuuanu reservoir near Honolulu 76 Pauoa Stream at upper Pauoa Valley, near Honolulu 78 Kahuawai Spring at upper Pauoa Valley, near Honolulu 79 Manoa Stream at upper Manoa Valley, near Honolulu 80 Manoa Stream at College of Hawaii, near Honolulu 80 East Branch of Manoa Stream at upper Manoa Valley, near Honolulu. 82 West Branch of Manoa Stream at upper Manoa Valley, near Honolulu. 84 Waiomao Stream at upper Palolo Valley, near Honolulu 85 Waimanalo ditch below main reservoir, near Waimanalo 86 Makawao ditch at Makawao flume, near Waimanalo 88 Makawao Stream in Kailua Valley, near Kailua 89 Kaimi Stream in Kailua Valley, near Kailua 91 Kamakalepo Stream in Kailua Valley, near Kailua 93 Pohakea Stream in Kailua Valley, near Kailua 94 South Branch of Kahanaiki Stream in Kailua Valley, near Kailua. . . 96 North Branch of Kahanaiki Stream in Kailua Valley, near Kailua. . . 96 Waiahole Stream at Manianiaula, near Waikane 97 Right Branch of North Fork of Kaukonahua Stream near Wahiawa. . 99 Left Branch of North Fork of Kaukonahua Stream near Wahiawa 100 South Fork of Kaukonahua Stream near Wahiawa 102 Miscellaneous measurements 103 Island of Maui 104 lao Stream near Wailuku 104 Maniania ditch near Wailuku 105 South Waiehu Stream near Wailuku 106 South Waiehu ditch near Wailuku 107 North Waiehu Stream near Wailuku ., = 109 Waihee Stream near Waihee 110 Spreckels ditch near Waihee 112 Kahakuloa Stream at Kahakuloa, near Waihee 113 Kahakuloa Stream near Honokahau 113 Honokahau Stream near Honokahau 115 Honokahau ditch at intake near Honokahau 116 Honolua Stream near Honokahau 117 Honokawai Stream near Lahaina 118 Honokawai ditch near Lahaina 119 Kahoma ditch at weir near Lahaina 121 Lahainaluna Stream near Lahaina 122 Lahainaluna ditch near Lahaina 124 Kauaula ditch near Lahaina 126 Launiupoko Stream near Lahaina 127 CONTENTS. 5 Gaging-station records — Continued. Island of Maui — Continued. Page. Olowalu Stream near Olowalu 128 Olowalu ditch No. 1 near Olowalu 129 Waikapu Stream near Waikapu 131 South Side Waikapu ditch near Waikapu 131 Palolo ditch near Waikapu 132 Haipuaena Stream (old station) near Huelo 134 Haipuaena Stream (new station) near Huelo 134 Puohakamoa Stream (old station) near Huelo 135 Puohakamoa Stream (new station) near Huelo 136 Alo Stream near Huelo 137 Waikamoi Stream near Huelo 138 Oopuola Stream near Huelo 139 Spreckels ditch at gage No. 1, near Huelo 141 Spreckels ditch at gage No. 2, near Huelo 141 Spreckels ditch at gage No. 3, near Huelo 142 Spreckels ditch at gage No. 4, near Huelo 142 Spreckels ditch at gage No. 5, near Huelo 143 Spreckels ditch at gage No. 6, near Huelo 143 Spreckels ditch at gage No. 8, near Huelo 144 NailiiUhaele Stream near Huelo 144 Kailua Stream near Huelo ..'... ^ 145 Oanui Stream near Huelo 146 Hoolawanui Stream near Huelo 147 Hoolawaliilii Stream near Huelo 148 Honopou Stream near Huelo 149 Miscellaneous measurements 151 Island of Hawaii 152 General conditions 152 Hilo group 153 Stations at 2,700-foot level 153 Wailuku River near Hilo 166 Honolii River at Kaiwiki near Hilo 167 Hamakua group 168 Hamakua ditch at main weir, Puualala, near Waimea 168 New Hamakua ditch at main weir near Kukuihaele 169 Kohala group 170 Kohala ditch near Kohala 170 Keheil^ ditch at Honokane Mauka, near North Kahala 173 Miscellaneous measurements 174 Rain gaging 174 Index 187 WATER RESOURCES OF HAWAII, 1913. By G. K. Larrison. AUTHORITY FOR INVESTIGATIONS. This volume contains results of measurements of tlie flow of cer- tain streams and ditches and rainfall records of the Territory of Hawaii made during the calendar year 1913. The investigations leading to the report were made by the United States Geological Survey in cooperation with the Territory of Hawaii, under the general sanction of the organic law of the Survey (Stat. L., vol. 20, p. 394), which contains the following paragraph: Provided, Thst this oflScer [the Director] shall have the direction of the geological survey and the classification of public lands and examination of the geological struc- tiu:e, mineral resomrces, and products of the national domain. As water is the most abundant and most valuable of the minerals, the investigation of water resources is authorized under the provision for examining mineral resources. The work has been supported since the fiscal year ending June 30, 1895, by appropriations in successive sundry civil bills passed by Congress under the following item: For gaging the streams and determining the water supply of the United States, and for the investigation of underground currents and artesian wells, and for the prepara- tion of reports upon the best methods of utilizing the water resources. The legislature of the Territory of Hawaii approved on March 22, 1909, "An act to promote the conservation and development of the natural resources of the Territory," which provided in substance as follows: A special tax of 2 per cent shall be levied, assessed, and col- lected annually on all incomes in excess of $4,000; and all amounts so collected shall constitute a special fund to be expended only for the encouragement of immigration and the conservation of natural resources in the proportion of three-fourths for immigration and one- fourth for conservation. The conservation fund shall be used for the development, conservation, improvement, and utilization of the nat- ural resources, and shall be available for expenditure at such times and in such manner as a board of three persons appointed in accord- ance with section 80 of the organic act shall, with the approval of the governor, determine. 7 8 WATER EESOITECES OF HAWAH, 1913. An act of April 26, 1911, amended tlie original act so as to extend it until December 31, 1913. On April 4, 1913, the governor of the Territory of Hawaii approved the following acts providing (act 56) for the creation and maintenance of a division of hydrography under the board of agriculture and forestry, and (act 57) appropriating the revenues from water Hcenses for the use of the board of commissioners of agriculture and forestry toward forest protection and hydrographic surveying. Section 1 of act 56 reads: The board of agriculture and forestry is hereby authorized to create and maintain a division of hydrography for the investigation and determination of the water re- sources of the Territory by the gaging of streams and rainfall and other means, in cooperation with the United States Geological Survey or otherwise, and in fm-ther- ance thereof to take over and exercise the functions of the Territory in the conduct of the present hydrographic survey of the Territory. Section 2 provides that this act shall take effect on July 1, 1913. Section 1 of act 57 reads: All revenues derived from water licenses, issued by the Territory, during the period beginning July 1, 1913, and ending June 30, 1915, whether by way of rental? or other- wise, shall constitute and be held as a special fund in the treasury of the Territory to be disbursed on warrants of the auditor issued on approved vouchers of the presi- dent of the board of commissioners of agriculture and forestry. Such moneys shall be apportioned and applied from time to time by the board of commissioners of agri- cultm-e and forestry, acting with the approval of the governor, equally between the division of forestry and the division of hydrography to the following general purposes, and not otherwise: 1. For the protection of forest reservations, established or set apart according to law, against damage by fire, animals, and otherwise by means of fences and any other means whatsoever, and for the expenditures of the division of forestry. 2. For the development and maintenance of the hydrographic sm^ey throughout the Territory. Each voucher against said fund shall designate the general purpose for which it is drawn. Section 2 provides that this act also shall take effect on July 1, 1913. COOPERATION. Under the authority conferred by the Federal and Territorial legislation, the Director of the United States Geological Survey and the governor of the Territory of Hawaii entered into a cooperative agreement, dating from July 1, 1910, for "the gaging of streams and the determination of the water supply of the Territory of Hawaii." ^ The principal features of this agreement are : 1, The United States Geological Survey assumes the responsibility of gathering, analyzing, and publishing the data. 2. During the progress of the work all notes, maps, and data gath- ered as a result of field studies are at all times open to inspection by 1 The United States Geological Survey is also cooperating with the Territory of Hawaii in mapping the several islands. The whole of the island of Kauai and a part of the island of Hawaii have been mapped. FIELD METHODS OF MEASUEHSTG STREAM FLOW. 9 the representative of tlie Territory, and if they are not entirely satis- factory the agreement can be terminated. 3. Accounts for payment of salaries, travel, and subsistence, sup- plies, or other expenses necessary to the completion of the work shall be rendered in the manner required by the laws and regulations of the contracting parties, and vouchers shall be preferred to either party for payment according as it may be convenient or according to the balance remaining in the respective allotments. 4. The cost of publication is borne entirely by the Geological Survey. The Territory of Hawaii was represented in the cooperation by the board of conservation appointed by Gov. Walter F. Frear, and con- sisted of J. P. Cooke (chairman), J. W. Caldwell, and E. V. Wilcox, until June 30, 1913. After this date the Territory was represented by the board of commissioners of agriculture and forestry, consisting of W. M. Giffard (president and executive ofScer), A. Waterhouse, J. M. Dowsett, H. M. von Holt, and A. H. Rice. SCOPE OF WORK. The investigations of stream flow in the Territory are not complete, nor do they include all the streams that might advantageously be studied. They include, however, as many of the streams and ditches on the four larger islands as the available appropriations would allow. It is essential that records of stream flow should be kept during a period of years long enough to determine within reasonable limits the range of flow from the maximum to the minimum. The length of such a period manifestly varies for different streams. Experience has shown that the records should be kept from 20 to 30 years. In the performance of this work an effort is made to reach the highest degree of precision possible with a rational expenditure of time and money. In aU engineering work there is a point beyond which refinement is needless and wasteful, and this statement applies with especial force to stream-measurement work in Hawaii. It has been found, however, that it is possible to obtain data which are sufficiently accurate, although many of those presented in this report are for periods too short to admit of definite conclusions. FIELD METHODS OF MEASURING STREAM FLOW. BASE DATA. In making plans for power, irrigation, municipal water supply, and other projects involving the use of water from surface streams itis necessary to have data from which both the total flow of the stream and its distribution from day to day throughout the year can be obtained. The data necessary for obtainmg such information are 10 WATER RESOURCES OP HAW AH, 1913. daily gage heights, which give the fluctuations of rise and fall of the stream, and measurements of discharge at various stages, from which a rating curve and table can be prepared, giving the discharge for any stage. Such a rating is possible from the fact that so long as the conditions at the controlling point in the stream remain the same there will be approximately the same discharge for any given gage height. The determination of a discharge is termed a discharge measure- ment, and points at which discharge measurements are made and records of daily fluctuations of stage are kept for determining the daily flow are termed gaging stations. Gaging stations may be divided into two classes, known as weir stations and velooity-area stations. At weir stations the head of water on the crest of the weir is measured and the discharge com- puted by means of a formula. The discharge at velocity-area stations is obtained by measuring the velocity of the current and the area of the cross-section, the product of the two giving the dis- charge. The data presented in this paper were collected at both weir and velocity-area stations. WEIB MEASUREMENTS. Unquestionably a weir prOperly constructed and of a type for which accurate coefficients have been determined is one of the most convenient and reliable means of measuring small quantities of water. In practice, however, weirs rarely conform to the requirements imposed by the experimenter who derived the coefficients. If the crest of the weir is sharp and clean and sufficiently high above the bottom of the leading channel and the end contractions are complete and the velocity of approach is wanting, or negligibly small, andif the head on crest is measured at a distance back of the overfaU of at least the weir crest length, the Francis formula will give good results. On the other hand, if these essential conditions are not complied with, especially if the velocity of approach is considerable and the contrac- tions are imperfect, the Francis formula will not give accurate results. This is particularly true if the weir is improperly constructed and there is leakage around and under it, as is so frequently the case in practice. Observations made on various types of weirs in Hawaii show that of the weirs in use in the Territory not all are giving accurate results. If the error is known so that corrections can be made the trouble is largely mitigated, but faulty weir records are too often accepted with- out investigation as to their accuracy. FIELD METHODS OP MEASURING STEEAM FLOW. 11 VELOCITY-AREA METHOD. The velocity-area metliod of measurement consists of determining the mean or average velocity of the water past a given cross-section area. The area of the cross section at right angles to the direction of flow is determined by soundings which are taken at such distances apart as will develop the contour of the stream bed. The depths are recorded and also their distances from some arbitrarily chosen initial point on one side of the stream. The method of making the soundings depends on the size and stage of the stream. On ditches and small streams, where the depths and velocities are not large, a graduated rod may be used to advantage; on large streams, which must be measured from bridges or cables, a lead weight and sounding line must be used. The weights are of different sizes — 6^, 10, or 15 pounds — according to the swiftness of the current, and are torpedo shaped, so as to offer as little resistance as possible to the moving water. On streams with beds which are permanent or nearly so a standard cross section is usually constructed from careful soundings and referred to the zero of the gage, so that the depths for any stage can be found by adding the gage height at that stage to the depths below the zero of the gage. This method is especially useful at high stages, when it is difficult to make accurate soundings. After the cross-section area of the stream has been measured by soundings and horizontal distances, the velocity is determined at a number of points. These measurements of velocity should be made at frequent intervals across the stream and close enough to take account of any abrupt change in the velocity. For convenience, the velocities are usually observed in the same verticals at which sound- ings are made. On some streams fairly good measurements of veloci- ties may be made by means of subsurface floats. This method is applicable, however, only to channels of uniform cross-section area over a considerable distance and is very unsatisfactory for use on natural streams Hke those of Hawaii.^ The velocity of flow is best determined by the current meter, which is a form of water wheel actuated by the current, and of such size and shape that it can easily be placed at any point in the stream. The new type of penta-recording current meter consists of six cups attached to a vertical shaft which revolves on a conical hardened- steel point when immersed in moving water. The revolutions are indicated electrically or acousticaUy, The rating, or relation between the velocity of moving water and the revolutions of the wheel, is determined for each meter by drawing it through still water for a given distance at different speeds and noting the number of revolu- i Further information regarding the float method is given in Water-Supply Paper 95 and in textbooks on stream flow. 12 WATER KESOUBOES OF HAWAII, 1913. tions for each. run. From these data a rating table is prepared which gives the velocity in feet per second of moving water for any number of revolutions in a given time interval. The ratio of revolutions per second to velocity of flow in feet per second is very nearly a constant for all speeds and is approximately 0.45. Three classes of methods of measuring velocity with current meters are in general use — multiple-point, single-point, and integration. The two principal multiple-point methods in general use are the vertical velocity curve and 0.2 and 0.8 depth. In the vertical velocity-curve method a series of velocity determi- nations are made in each vertical at regular intervals, usually about 10 to 20 per cent of the depth apart. By plotting these velocities as abscissas and their depths as ordinates and drawing a smooth eurve among the resulting points, the vertical velocity curve is developed. This curve shows graphically the magnitude and changes in velocity from the surface to the bottom of the stream. The mean velocity in the vertical is then obtained by dividing the area bounded by this velocity curve and its axis by the depth. This method of obtaining the mean velocity in the vertical is probably the best known, but on account of the length of time required to make a complete meas- urement its use is largely limited to the determination of coefficients for purposes of comparison. In the second multiple-point method the meter is held successively at 0.2 and 0.8 depth, and the mean of the velocities at these two points is taken as the mean velocity for that vertical. On the assump- tion that the vertical velocity curve is a common parabola with hori- zontal axis, the mean of velocities at 0.22 and 0.79 depth wiU give (closely) the mean velocity in the vertical. Actual observations under a wide range of conditions show that this multiple-point method gives the mean velocity very closely for open-water condi- tions and that in a completed measurement it seldom varies as much as 1 per cent from the value given by the vertical velocity-curve method. It is very extensively used in the regular practice of the United States Geological Survey. The single-point method consists in holding the meter either at the depth of the thread of mean velocity or at an arbitrary depth for which the coefficient for reducing to mean velocity has been determined or must be assumed. Extensive experiments by means of vertical velocity curves show that the thread of mean velocity generally occurs between 0.5 and 0.7 total depth. In general practice the thread of mean velocity is considered to be at 0.6 depth, and at this point the meter is held in most of the measiu'ements made by the single-point method. A large number of vertical velocity curve measurements, taken on many streams and under varying conditions, show that the average coefficient for reducing the velocity obtained at 0.6 depth to mean FIELD METHODS OF MEASURING STREAM FLOW. 13 velocity is practically unity. The variation of the coeflB.cient from unity in individual cases is, however, greater than in the 0.2 and 0.8 method and the general results are not as satisfactory. In the other principal single-point method the meter is held near the surface, usually 1 foot below, or low enough to be out of the effect of the wind of other disturbing influences. This is known as the sub- surface method. The coefficient for reducing the velocity taken at the subsurface to the mean has been found to be in general from about 0.85 to 0.95, depending on the stage, velocity, and channel conditions. The higher the stage the larger the coefficient. This method is especially adapted for flood measurements, or for measure- ments when the velocity is so great that the meter can not be kept in the correct position for the other methods. The vertical integration method consists in "moving the meter at a slow but uniform speed from the surface to the bottom and back again to the surface and noting the number of revolutions and the time taken in the operation. This method has the advantage that the velocity at each point of the vertical is measured twice. It is useful as a check on the point methods. In using the Price meter great care should be taken that the vertical movement of the meter is not rapid enough to vitiate the accuracy of the resulting velocity deter- mination. In practical work on rough streams, such as exist in Hawaii, the meter should be held at 0.6 depth for depths of 1 foot or less. For greater depths the meter should be held at two points in the vertical, 0.2 and 0.8 from the surface. When the mean velocities in the different verticals have been found, the average of two adjacent means is taken as the mean velocity for that individual section. The area of the section is computed by multiplying the width of the section by the mean depth. The discharge of each section is then the product of the area multiplied by the mean velocity, and the total discharge of the stream results from summing up the discharge of the individual sections. In prac- tice the work is tabulated in such a way as to render the computation very simple.^ Current meter measurements are not practicable where there are eddies, cross currents, swirls, or passages for the water underneath stones. It is usually possible, however, to improve the channel by removing bowlders and rocks, so that a satisfactory measuring sec- tion may be obtained, even on rough, steep streams such as exist in Hawaii. Three kinds of velocity-area gaging stations are in general use in Hawaii, according to the means provided for making the observations of depth and velocity. They are wading, bridge, and cable stations. 1 For a discussion of methods of computing the discharge of a stream see Engineering News, June 25, 1908. 14 WATER BESOXJECES OP HAWAII, 1913. A wading station is one at which measurements are made only by wading; that is, no means exist for getting above the water at any stage except by wading. Such stations are usually on ditches or wide, shallow streams, which do not fluctuate greatly in flow. Frequently, however, measmements are made at low stages by wad- ing, even though other means exist for making measurements at higher stages. A bridge station is one at which the meter is used from a bridge. In some places highway or other bridges are available from which to make measurements, but generally they are not at the right place on the stream. Special bridges are then built. A cable station is one at which measurements are made from a cable spanning the stream. Cable stations are used on large streams, such as Hanapepe, Wailua, and Hanalei rivers on the island of Kauai, and Wailuku River on the island of Hawaii. The cable supports the car from which a man works above the water. Distances are marked off on the cable itself or on a small auxiliary cable stretched taut above it. A suitable place for a gaging station having been selected, a staff gage is set in the edge of the stream, either vertical or inchned, but graduated into tenths, half-tenths, or hundredths of feet vertically. The gage is securely fastened to rocks or trees to prevent displace- ment by floods and is so placed that the zero, or reference datum, is well below extreme low water. The datum is also referred to a per- manent bench mark as an additional precaution. A water-stage recorder is then installed or an observer is engaged to record the heights of water morning and evening, and the mean of the two readings is used as the mean gage height for the day. Owing to the rapid rise and fall of most of the streams in Hawaii, two gage-height readings a day will not as a rule give a true mean for the 24 hours. For this reason, and also owing to the fact that many of the gaging stations are necessarily situated in the mountains at points remote from all habitations and difficult of access, it has generally been found necessary to use water-stage recorders. These instruments are of various types, some requiring weekly visits and others operating for a month without attention. The essential features of water-stage recorders comprise a float free to rise and fall with fluctuations of the water surface, a device for transferring the motion of the float to the record sheet (either directly or through a reducing mechanism), the recording device, and the clock. The instruments may be designed for any range of stage. Those used by the United States Geological Survey in Hawaii are designed for ranges up to as high as 36 feet, but so far those having a 20-foot range have been found to be sufficient for any stage. WATER RESOURCES OF HAWAII, 1913. 15 DEFINITION OF TERMS. The volume of water flowing in a stream — the "run-off" or "dis- charge" — is expressed in various terms, each of which has become associated more or less definitely with a certain class of work. These terms may be divided into two groups: (1) Those which represent a rate of flow, as "second-feet"; "gallons per minute," "gallons per 24 hours," "miner's inches," and "run-off in second-feet per square mile," and (2) those which represent the actual quantity of water, as "run-off in depth in inches," "million gallons," and "acre-feet." They may be defined as follows: "Second-foot" is an abbreviation for cubic foot per second, and is the unit for the rate of discharge of water flowing in a stream 1 square foot in cross section at a rate of 1 foot per second. It is generaUy adopted as the fundamental unit in the measurement of flowing water and is the "natural" unit, as the foot and the second are the units used in making the physical determinations. Other units may be computed from this by the use of factors given in the table of equiv- alents. "Gallons per minute" is generally used in connection with pumping and city water supply, the United States gallon of 231 cubic inches being the unit of quantity and 1 minute the unit of time. The "miner's inch" is the unit for the rate of discharge of water that passes through an orifice 1 inch square under a head which varies locally. It is commonly used by miners and irrigators throughout the West, and is defined by statutes in each State in which it is used. "Second-feet per square mile" is the average number of cubic feet of water flowing per second from each square mile of area drained, on the assumption that the run-off is distributed uniformly both as re- gards time and area. "Run-off in inches" is the depth to which the drainage area would be covered if all the water flowing from it in a given period were con- served and uniformly distributed on the surface. It is used for com- paring run-off with rainfall, which is usually expressed in depth in inches. An "acre-foot" is equivalent to 43,560 cubic feet, and is the quantity required to cover an acre to the depth of 1 foot. The term is com- monly used in connection with storage for irrigation. In the Territory of Hawaii a unit commonly used in connection with the measurement of water is the "million gaUons. " This is used with two meanings — -(1) to indicate a rats of flow and (2) to express an actual quantity of water. In the former sense "million gallons per 24 hours" is inferred, 1,000,000 gallons being taken as the luiit of quan- tity and 24 hours as the unit of time. With this meaning the term is generally used in connection with pumping and irrigation. In the 16 WATER EESOURCES OP HAWAII^ 1913. latter sense ''million gallons" as an absolute quantity is used in the measurement of storage capacities of reservoirs. The following convenient approximate relations exist between second-feet, million gallons per 24 hours, and acre-feet: 1 second- foot flowing 24 hours equals about 2 acre-feet; 1,000,000 gallons equals about 3 acre-feet; and 1 second-foot equals approximately two-thirds million gallons per 24 hours. ''Man's water" is an irrigator's terms also in common use in Hawaii. It signifies the amount of water that one irrigator can properly handle in the field. It varies greatly, being dependent upon the condition of the furrows, the age of the crop, and the skill and individuality of the irrigator. CONVENIENT EQUIVALENTS. The following is a list of convenient equivalents for use in hydraulic computations : Table for converting discharge in second-feet into run-off in acre-feet. Discharge (second- Run-ofl (acre-feet). feet). Iday. 28 days. 29 days. 30 da3^. 31 days. 1 1.983 55.54 57.52 59.50 61.49 2 3.967 111.1 115.0 119.0 123.0 3 5.950 166.6 172.6 178.5 184.5 4 7.934 222.1 230.1 238.0 246.0 5 9.917 277.7 287.6 297.5 307.4 6 11.90 333.2 345.1 357.0 368.9 7 13.88 388.8 402.6 416.5 430.4 8 15.87 444.3 460.2 476.0 491.9 9 17.85 499.8 517.7 535.5 553.4 Note. — For part of a month multiply values for one day by the number of days. 1 second-foot equals 7.48 United States gallons per second; equals 448.8 gallons per minute; equals 646,317 gallons for one day. 1 second-foot for one year (365 days) covers 1 square mile 1.131 feet or 13.572 inches deep. 1 second-foot for one year (365 days) equals 31,536,000 cubic feet. 1 second-foot for one year (365 days) equals 724 acre-feet. 1 second-foot equals about 1 acre-inch per hour. 1 second-foot for one. day covers 1 square mile 0.03719 inch deep. 1 second-foot for one day equals 1.PS3 acre-feet. 1,000,000 United States gallons per'day equals 1.55 second-feet. 1,000,000 United States gallons equal 3.07 acre-feet. 1,000,000 cubic feet equals 22.95 acre-feet. 1 acre-foot equals 325,850 gallons. 1 inch deep on 1 square mile equals 2,323,200 cubic feet. 1 inch deep on 1 square mile equals 0.0737 second-foot per year. 1 foot equals 0.3048 meter. 1 mile equals 1.60935 kilometers. 1 mile equals 5,280 feet. 1 acre equals 0.4047 hectare. 1 acre equals 43,560 square feet. OFFICE METHODS. 17 1 acre equals 209 feet square, nearly. 1 square mile equals 2.59 square kilometers. 1 cubic foot equals 0.0283 cubic meter. 1 cubic foot equals 7.48 gallons. 1 cubic foot of "water weighs 62.5 pounds. 1 cubic meter per minute equals 0.5886 second-foot. 1 horsepower equals 550 foot-pounds per second. 1 horsepower equals 76.0 kilogram-meters per second. 1 horsepower equals 746 watts. 1 horsepower equals 1 second-foot falling 8.80 feet. IJ horsepower equals about 1 kilowatt. , , . ,, Sec.-ft.Xfall infeet ^ , To calculate water power quickly: tt =net horsepower on water wheel realizing 80 per cent of theoretical power. OFFICE METHODS OF COMPUTING AND STUDYING DISCHARGE AND RUN- OFF. At the end of each year the field or base data for current-meter gaging stations, consisting of water-stage record sheets, daily gage heights, discharge measurements, and notes from observers' books are assembled. The measurements are plotted on cross-section paper and rating curves are drawn wherever feasible. The rating tables prepared from these curves are then appUed to the tables of daily gage heights to obtain the daily discharge, and from these appUca- tions the tables of monthly discharge and run-off are computed. Rating curves are drawn and studied with special reference to the class of channels which they represent. The discharge measure- ments for all classes of stations, when plotted with gage heights in feet as ordinates and discharges in second-feet as abscissas, define rating curves which are generally more or less parabohc in form. For many stations curves of area in square feet and mean velocity in feet per second are also constructed to the same scale of ordinates as the discharge curve. These are used mainly to extend the dis- charge curves beyond the limits of the plotted discharge measure- ments, to check the form of the discharge curve, and to determine and eliminate erroneous measurements. For every rating table the following assumptions are made for the period of application of the table: (a) That the discharge is a func- tion of and increases gradually with the stage; (h) that the discharge is the same whenever the stream is at a given stage, and hence such changes in conditions of flow as may have occurred during the period of application are either compensating or neghgible, except that the rating, as stated in the footnote of each table, is not applicable for periods during which the channel was obstructed; (c) that the increased and decreased discharge due to change of slope on rising and falling stages is either negligible or compensating. 97764°— WSP 373—15 -2 18 WATER EESOTJECES OF HAWAII, 1913. As already stated; the gaging stations may be divided into several classes, as indicated in the following paragraphs : The stations of class 1 represent the most favorable conditions for an accurate rating and are also the most economical to maixitain. The bed of the stream is usually composed of rock and is not subject to the deposit of sediment and loose material. This class includes also many stations located in a pool below which is a permanent rocky riffle that controls the flow like a weir. Provided the control is sufficiently high and close to the gage to prevent cut and fill at the gaging point from materiaUy affecting the slope of the water surface, the gage height wiU for all practical purposes be a true index of the discharge. Discharge measurements made at such stations usually plot within 2 or 3 per cent of the mean discharge curve, and the rating developed from that curve represents a very high degree of accuracy. Class 2 comprises mainly stations on rough, mountainous streams with steep slopes. The beds of such streams are, as a rule, com- paratively permanent during low and medium stages, and when the flow is sufficiently weU defined by an adequate number of discharge measurements before and after each flood the stations of this class give nearly as good results as those of class 1. As it is seldom pos- sible to make measurements covering the time of change at flood stage, the assumption is often made that the curves before and after the flood converged to a common point at the highest gage height recorded during the flood. Hence the only uncertain period occurs during the period of actual change in conditions of flow. Class 3 includes those stations where the stream bed is of a shifting character, or the controlling section below the gage frequently changes owing to cutting out by the current and the filling in of sand, gravel, and drift. In some cases in Hawaii changes are caused by the growth of vegetation in the stream bed. No absolute rule can be laid down for stations of this class. Each rating curve must be constructed mainly on the basis of the measurements of the cur- rent year, the engineer being guided largely by the history of the station and the following general law: If all measurements ever made at a station of this class are plotted on cross-section paper, they wiU define a mean curve which may be called a standard curve. It has been found in practice that if after a change caused by high stage a relatively constant condition of flow occurs at medium and low stages, all measurements made after the change will plot on a smooth curve which is practically parallel to the standard curve with respect to ordinates or gage heights. This law of the paraUeUsm of rating curves is the fundamental basis of all ratings and estimates at stations with semipermanent and shifting channels. It is not absolutely cor- rect, but, with few exceptions, answers all the practical requirements OFFICE METHODS. 19 of estimates made at low and medium, stages after a change at a high stage. This law appears to hold equally true whether the change occurs at the measurmg section or at some controlling point below. The change is, of course, fundamentally due to change in the chan- nel caused by cut or fill, or both, at or near the measuring section. For all except small streams the changes in section usually occur at the bottom. The following simple but typical examples illustrate this law: (a) If 0.5 foot of planking were to be nailed on the bottom of a well- rated wooden flume of rectangular section, there would result, other conditions of flow being equal, new curves of discharge, area, and velocity, each plotting 0.5 foot above the original curves when referred to the original gage. In other words, this condition would be analogous to a uniform fill or cut in a river channel which either reduces or increases aU three values of discharge, area, and velocity for any gage height. In practice, however, such ideal conditions rarely exist. (6) In the case of a cut or fill at the measuring section, there is a marked tendency toward decrease or increase, respectively, of the velocity. In other words, the velocity has a compensating effect, and if the compensation is exact at aU stages the discharge at a given stage will be the same under both the new and the old conditions. (c) In the case of uniform change along the crest of a weir or rocky control, the area curve wiU remain the same as before the change, and it can be shown that here again the change in velocity curve is such that it will produce a new discharge curve essentially parallel to the original discharge curve with respect to their ordinates. Of course, in actual practice such simple changes of section do not occur. The changes are complicated and lack uniformity, a cut at one place being largely offset by a fill at another, and vice versa. If these changes are very radical and involve large percentages of the total area — as, for example, on small streams — there may result a wide departure from the law of paralleHsm of rating curves. In compHcated changes of section the corresponding changes in velocity which tend to produce a new parallel discharge curve may interfere with each other materially, causing eddies, boils, backwater, and radical changes in slope. In such extreme conditions, however, the measuring section would more properly fall imder class 4 and would require very frequent measurements of discharge. Special stress is laid on the fact that in the lack of other data to the contrary the utiHzation of this law wiU yield the most probable results. Slight changes at low or medium stages of an oscillating character are usually averaged by a mean curve drawn among them parallel to the standard curve, and if the individual measurements do not 20 "WATER RESOXJRCES OF HAWAH, 1913. vary more than 5 per cent from the rating cm-ve the results are considered good for stations of this class. Class 4 comprises stations on streams that have soft, muddy, or sandy beds. Good results can be obtained from such sections only by frequent discharge measurements, the frequency ranging from a measurement every two or three weeks to a measurement every day, according to the rate of diurnal change in conditions of flow. These measurements are plotted and a mean or standard curve drawn among them. It is assumed that there is a different rating curve for every day of the year and that this rating is parallel to the stand- ard curve with respect to their ordinates. On the day of a measure- ment the rating curve for that day passes through that measurement. For days between successive measurements it is assumed that the rate of change is uniform, and hence the ratings for the intervening days are equally spaced between the ratings passing through the two measurements. This method must be modified or abandoned altogether under special conditions. Personal judgment and a knowledge of the conditions involved can alone dictate the course to pursue in such cases. The computations have, as a rule, been carried to three significant figures. Computation machines and the 20-inch shde rule have been generally used. All computations are carefully checked. After the computations have been completed they are entered in tables and carefully studied and intercompared to eliminate or account for all gross errors so far as possible. Missing periods are filled in, so far as feasible, by means of comparison with records for adjacent streams. The attempt is made to complete years or periods of discharge, thus ehminating fragmentary and disjointed records. Full notes accompanying such estimates follow the daily and monthly discharge tables. EXPLANATION OF TABLES. For each regular current-meter gaging station are given in general the following data: Description of station, list of discharge measure- ments, table of daily discharge, table of monthly and yearly discharge, and run-off in acre-feet. All rates of flow are expressed as second-feet, because distances and depths are measured in feet, and velocities in feet per second. The flow is thus obtained in cubic feet per second, or more briefly in '/second-feet." The term ''nulhon gallons per 24 hours" is not used except in a few tables where data have been furnished in these units by private cooperations. ''Milhon gallons per 24 hours" is not a primary but a derived unit. To convert second-feet into million gallons per 24 hours multiply by 0.646. ACCUEACY OP FIELD DATA. 21 In addition to statements regarding the location and installation of current-meter stations, the descriptions give information in regard to any conditions which may affect the constancy of the relation of gage height to discharge, covering such points as shifting channels and backwater; also information regarding diversions which decrease the total flow at the measuring section. Statements are also made regarding the accuracy and reliabihty of the data. The discharge-measurement table gives the results of the discharge measurements made during the year, including the date, name of hydrographer, gage height, and discharge in second-feet. The discharge measurements and gage heights are the base data from which rating tables, daily discharge tables, and monthly dis- charge tables are computed. The table of daily discharge gives the discharge in second-feet cor- responding to the observed gage height as determined from the rating table, the number of significant figures used varying with the size of the discharge. In the table of monthly discharge the column headed "Maximum" gives the mean flow, as determined from the rating table, for the day when the mean gage height was highest. As the gage height is the mean for the day, it does not indicate correctly the stage when the water surface was at crest height and the corresponding discharge was consequently larger than given in the maximum column. Like- wise in the column of "Minimum" the quantity given is the mean flow for the day when the mean gage height was lowest. The column headed "Mean" gives the average flow in cubic feet for each second during the month. The "run-off in acre-feet" given in the column under that head is computed from the mean discharge in second-feet. ACCURACY OF FIELD DATA AND COMPUTED RESULTS. The accuracy of stream-flow data depends (1) on permanence of the relation between discharge and stage, and (2) on the accuracy of observations of stage, measurements of discharge, and interpreta- tion of data. The accuracy column in the monthly discharge table does not apply to the maximum or minimum nor to any individual day, but to the monthly mean. It is based on the accuracy of the rating, the probable rehabiUty of the observer, the number of gage readings per day, the range of the fluctuation in stage, and knowledge of local conditions. In this column, A indicates that the mean monthly flow is probably accurate within 5 per cent; B, within 10 per cent; C, within 15 per cent; D, within 25 per cent. Special conditions are covered by footnotes. It should be borne in mind that the observations in each succeeding year may be expected to throw new light on data already collected and pubHshed. 22 WATER EESOUECES OF HAWAH, 1913. DIVISION OF WORK. On account of the isolation of the different islands of the Territory an engineer or employee was assigned to take charge of the field work on each of the four largest islands, with temporary headquarters on those islands. Persons in charge of field work. Island. In charge. Headquarters. Oahu G. K. Larrison, district engineer Honolulu (permanent). Do. J. C. Dort, assistant engineer Kauai W. V. Hardy, field assistant Waimea (temporary). Wailuku (temporary). Hilo a. (temporary). Maui . C. T. Bailey, assistant engineer E. 0. Christiansen, assistant engineer a Discontinued July 18, 1913. The ratings, applications, and computations were made by J. C. Dort, C. T. Bailey, W. V. Hardy, E. O. Christiansen, Howard Kimble, H. A. R. Austin, E. E. Goo, G. R. White, John Kaheaku, S. W. Dort, H. M. Kennedy, and R. M. S. Goo. The report was edited by Mrs. B. D. Wood. GAGING STATIONS MAINTAINED IN HAWAII. The following list comprises the gaging stations maintained in Hawaii by the United States Geological Survey and cooperative parties. The stations are arranged by stream basins and appear in systematic order for the several islands, tributaries of main, streams being indicated by indention. The date refers to the years or parts of years for which records are available. A dash following the date indicates that the station was being maintained December 31, 1913. KAUAI ISLAND. Waimea River near Waimea, 1910- Poomau River: Kawaikoi Stream near Waimea, 1909- Waiakoali Stream near Waimea, 1909-1912. Mohihi Stream near Waimea, 1909-1912. Waialae River near Waimea, 1910- Kekaha ditch, at Weir, Camp No. 1, near Waimea, 1910-1912. Kekaha ditch at flume No. 3, near Waimea, 1910-1912. Kekaha ditch, at siphon, near Waimea, 1910-1912. Kekaha ditch at tunnel No. 12 weir, near Waimea, 1910-1912. Waimea ditch near Waimea, 1911-1913. Kamenehune ditch near Waimea, 1911-12. Makaweli River near Waimea, 1911- Halekua Stream near Waimea, 1912-13. Olokele River: Olokele ditch at tunnel No. 12, near Makaweli, 1904- Olokele ditch near Makaweli, 1912- Poowaiomahalhai ditch near Waimea, 1911-1913. GAGING STATIOITS. 23 Hanapepe River above Hanapepe Falls, near Eleele, 1911-12. Hanapepe River at Koula, near Eleele, 1910- Hiloa ditch at Hanapepe Falls, near Eleele, 1911- East Branch Hanapape River below Hanapepe Falls, near Eleele, 1911-12. Hanapepe ditch below Hanapepe Falls, near Eleele, 1911-12. Hanapepe ditch at Koula, near Eleele, 1910- Hanapepe ditch at weir, near Hanapepe, 1910- Huleia River near Lihue, 1912- Hanamaulu River at Kapaia, near Lihue, 1911- Wailua River: South Fork of Wailua River at siphon, near Lihue, 1910-11. South Fork of Wailua River above Waiehu Falls, near Lihue, 1911- Hanamaulu ditch near Lihue, 1910- Lihue ditch near Lihue, 1910- North Fork of Wailua River near Lihue, 1910- Kanaha ditch near Lihue, 1910- East Branch of North Fork of Wailua River, near Lihue, 1912- Uhau lole Stream at 750-foot elevation, near Lihue, 1912. Keahua Stream at 750-foot elevation, near Lihue, 1912. Kawi Stream at 750-foot elevation, near Lihue, 1912. Konohiki Stream at Makakualele welr (mauka), near Kapaa, 1911- Kaehulua Stream at Kuhinoa (mule stable) weir, near Kapaa, 1911-1913. South Fork of Kaehulua Stream at Wainamuamu weir, near Kapaa, 1911-12. North Fork of Kaehulua Stream at Wainamuamu weir, near Kapaa, 1911- Kapaa River, near Kealia, 1910- AkulikuU. Spring near Kealia, 1911-1913. Kapahi ditch at Kapahi, near Kealia, 1909- Tunnel ditch at Kapahi, near Kapaa, 1909-1911. Kapaa ditch at Kapahi, near Kapaa, 1909-1911. Pipe ditch at Kapahi, near Kapaa, 1909-1911. Kealia Stream: Kaneha ditch near Kealia, 1909- Anahola River at 1,140-foot elevation, near Kealia, 1912. Anahola River above dam at Kiokala, near Kealia, 1910. 1912- Anahola River at Kiokala dam, near Kealia, 1910-1912. Anahola ditch at Kiokala, near Kealia, 1909- Anahola ditch at Makai weir, near Kealia, 1909-1911. Kalihiwai River near Kilauea, 1912- Hanalei River near Hanalei, 1911- China ditch near Hanalei, 1911-12. Kuna ditch near Hanalei, 1912-13. Lumahai River near Wainiha, 1912. Wainiha River, East Channel, near Wainiha, 1912- Wainiha River, West Channel, near Wainiha, 1911- Waiaiha canal at intake, near Wainiha, 1910-1912. Wainiha canal at tunnel No. 18, near Wainiha, 1911. Wainiha canal at taihace, near Wainiha, 1911. OAHU ISLAND. Kalihi Stream at Kioi pool near Honolulu, 1913- Nuuanu Stream at Luakaha weir in upper Nuuanu Valley, near Honolulu, 1903, 1910-13. Nuuanu Stream below Reservoir No. 2 wasteway, near Honolulu, 1913- 24 WATER BESOUECES OP HAWAH, 1913. Nuuanu Stream at KuaMni Street, near Honolulu, 1911-12. Lulumaha ditch at upper Nuuanu Reservoir, near Honolulu, 1911-1913. Pauoa Stream at upper Pauoa Valley, near Honolulu, 1911- Kahuawai Spring at upper Pauoa Valley, near Honolulu, 1912- Manoa Stream at upper Manoa Valley, near Honolulu, 1910-1913. Manoa Stream at College of Hawaii, near Honolulu, 1909- West Branch of Manoa Stream at upper Manoa Valley, near Honolulu, 1913- East Branch of Manoa Stream at upper Manoa Valley, near Honolulu, 1913- Palolo Stream. Pukele Stream at Mahoe springs, near Honolulu, 1912- Waiomao Stream at upper Palolo Valley, near Honolulu, 1911-13. Waiomao Stream above Pukele, near Honolulu, 1911-12. Waimanalo ditch below main reservoir, near Waimanalo, 1912-13. Pump ditch near Waimanalo, 1912. Makawao ditch at Makawao flume, near Waimanalo, 1912- Kailua Stream near Kailua, 1912- Makawao Stream in KaUua Valley, near Kailua, 1912- Kaimi Stream in Kailua Valley, near Kailua, 1912- Kamakalepo Stream in Kailua Valley, near Kailua, 1912- Pohakea Stream in Kailua Valley, near Kailua, 1912- Kahanaiki Stream in Kailua Valley, near Kailua, 1912. South Branch Kahanaiki Stream in Kailua Valley, near Kailua, 1913- North Branch Kahanaiki Stream in Kailua Valley, near Kailua, 1913- Kahanaiki ditch in Kailua Valley, near Kailua, 1912-13. Waiahole Stream at Manianiaula, near Waikane, 1911- Waiahole Stream at Waiahole, near Waikane, 1911-12. Waihi Stream, near Waikane, 1911. Halona Stream, near Waikane, 1911. Waianu Stream, near Waikane, 1911. Waikane Stream near Waikane, 1911-12. Punaluu Stream near Hauula, 1906-7. Kaluanui Stream near Hauula, 1906-7. Kaipapau Stream near Hauula, 1906-7. Kaukonahua Stream: North Fork of Kaukonahua Stream near Wahiawa, 1911. Right Branch of North Fork of Kaukonahua Stream near Wahiawa, 1913- Left Branch of North Fork of Kaukonahua Stream near Wahiawa, 1913- South Fork of Kaukonahua Stream near Wahiawa, 1911, 1913- Wahiawa Reservoir ditch near Wahaiwa, 1910-11. MAUI ISLAND. West Maul, lao Stream near Wailuku, 1910- Maniania ditch near Wailuku, 1909-1913. Waiehu Stream: South Waiehu Stream near Wailuku, 1910- South Waiehu ditch near Wailuku, 1912- North Waiehu Stream near Wailuku, 1912- North Waiehu ditch near Wailuku, 1910-11. Waihee Stream near Waihee, 1910-1912, 1913— Waihee canal near Waihee, 1910-1912. Waihee canal at weir, near Wailuku, 1911-12. Spreckels ditch near Waihee, 1910-1913. Spreckels ditch at Waiale weir, near Wailviku, 1910-11. GAGING STATIONS. 25 Kahakuloa Stream at Kahakuloa, near Waihee, 1912-13. Kaliakuloa Stream near Honokahau, 1913- Honokahau Stream near Honokaliau, 1913- Honokahau ditch at intake, near Honokahau, 1907-1913. Honokahau ditch, above Honolua Stream, near Honokahau, 1910-11. Honoki^u ditch, at Honokawai weir, near Lahaina, 1910-1912. Honolua Stream at Honolua ranch, 1911. Honolua S tream near Honokahau, 1913- Honolua ditch near Honokahau, 1911-12. Honokawai Stream near Lahaina, 1911; 1912- Honokawai Stream at weir No. 1, near Lahaina, 1901. Honokawai ditch near Lahaina, 1912- Kahoma Stream near Lahaina, 1911-12. Kahoma Stream at weir No. 1, near Lahaina, 1901. 'Kahoma Stream at weir No. 2, near Lahaina, 1901. Kahoma ditch at weir, near Lahaina, 1911- Lahainaluna Stream near Lahaina, 1911- ' Lahainaluna weir No. 1 near Lahaina, 1901. Lahainaluna weir No. 2 near Lahaina, 1901. Lahainahma ditch near Lahaina, 1913- Kauaula Stream near Lahaina, 1912. Kauaula Stream at weir No. 3, near Lahaina, 1901. Kauaula ditch near Lahaina, 1911- Kauaula Stream, North Fork, at weir No. 1, near Lahaina, 1901. Kauaula Stream, South Fork, at weir No. 2, near Lahaina, 1901. Launiupoko Stream near Lahaina, 1911- Olowalu Stream near Olowalu, 1913. Olowalu ditch No. 1 near Olowalu, 1911- Ukumehame Stream near Olowalu, 1911-12. Waikapu Stream near Waikapu, 1910- Palolo (Everett) ditch near Waikapu, 1910- -, South Side Waikapu ditch near Waikapu, 1910- East Maul. Koolau Ditch region: Koolau ditch near Keanae, 1910-1912. Koolau ditch at Alo division weir, near Huelo, 1908-1913 . Spreckels ditch region: Haipuaena Stream near Huelo, 1910-. Puohakamoa Stream near Huelo, 1910-. Alo Stream near Huelo, 1910-. Waikamoi Stream near Huelo, 1910-. Oopuola Stream near Huelo, 1910-. Spreckels ditch at station No. 1, near Huelo, 1910-1913. Spreckels ditch at station No. 2, near Huelo, 1911-1913. Spreckels ditch at station No. 3, near Huelo, 1910-1913. Spreckels ditch at station No. 4, near Huelo, 1910-1913. Spreckels ditch at station No. 5, near Huelo, 1911-1913. Spreckels ditch at station No. 6, near Huelo, 1911-1913. Spreckels ditch at station No. 7, near Huelo, 1911-12. Spreckels ditch at station No. 8, near Huelo, 1911-1913. Center ditch region : Center ditch near Huelo, 1910-1912. 26 WATER EESOURCES OF HAWAH, 1913. Hamakua ditcli region: NailiilLhaele Stream near Huelo, 1910-1912; 1913- Kailua Stream near Huelo, 1910-1912; 1913- Oanui Stream near Huelo, 1910-11; 1913- Hoolawaliilii Stream near Huelo, 1911- Hoolawanui Stream near Huelo, 1911- Honopou Stream near Huelo, 1910- Halehaku Stream at dam, near Huelo, 1910-11. Halehaku Stream weir near Huelo, 1910-1912. Opana Stream near Huelo, 1910-1912. Opana ditcli near Huelo, 1910-1912. New Hamakua ditcli at Nailiilihaele weir, near Huelo, 1910-1912. New Hamakua ditcli at Halehaku weir, near Huelo, 1910-1912. New Hamakua ditcli at station No. 1, near Huelo, 1912. New Hamakua ditcli at station No. 2, near Huelo, 1912. New Hamakua ditch at station No. 3, near Huelo, 1912. New Hamakua ditch at station No. 4, near Huelo, 1912. New Hamakua ditch at station No. 5, near Huelo, 1912. Old Hamakua ditch at Opana weir, near Huelo, 1910-1912. Kaluanui ditch at Puuomalei, near Hamakuapoko, 1910-1912. Lowrie ditch at Opana weir, near Huelo, 1910-1912. Haiku ditch at Peahi weir, near Huelo, 1910-1912. * HAWAII ISLAND. Hilo group: 81 stations at 2,700 feet elevation, in forest back of Hilo, 1911-1913. Wailuku River near HUo, 1911-1913. Honolii River at Kaiwiki, near Hilo, 1911-1913. Honolii ditch at Kaiwiki, near Hilo, 1911. Kawainui River at Kawainui, near Pepeekeo, 1911-12. 4 stations at Piihonua, near Hilo, 1912. Hamakua group: Waipio River below Koiawe, near Waipio, 1911-12. Waipio River below Waima, near Waipio, 1911-12. Waipio River at 360 feet elevation, near Waipio, 1901-2. New Hamakua ditch at Waima Stream, near Waipio, 1912. New Hamakua ditch at main weir, near Kukiuhaele, 1910- Hamakua ditch at main weir, at Puualala, Waimea, 1913. Kawainui Branch of Waipio River, near Waipio, 1911-12. Kawainui Stream at 2,120 feet elevation, near Waipio, 1901-2. Kawainui Stream at 1,435 feet elevation, near Waipio, 1901-2. Kawainui Stream at 775 feet elevation, near Waipio, 1901-2. Branch No. 3 of Kawainui Stream at 1,700 feet elevation, near Waipio, 1901-2. Branch No. 2 of Kawainui Stream at 1,405 feet elevation, near Waipio, 1901-2. Branch No. 1 of Kawainui Stream at 1,380 feet elevation, near Waipio, 1901-2. Alakahi Stream at 1,200 feet elevation, near Waipio, 1901-2. Alakahi Stream at 730 feet elevation, near Waipio, 1901-2. Koiawe Stream at 1,120 feet elevation, near Waipio, 1901-2. Koiawe Stream at 610 feet elevation, near Waipio, 1901-2. Waima Stream at 790 feet elevation, near Waipio, 1901-2. Waima Stream at 385 feet elevation, near Waipio, 1901-2. ISLAND OP KAUAI. 27 Koliala group: Honokane Stream: East Brancli of Honokane Stream at 1,300 feet elevation, near Honokane, 1901. East Brancli of Honokane Stream at 770 feet elevation, near Honokane, 1901. West Brancli of Honokane Stream at 1,370 feet elevation, near Honokane, 1901. West Brancli of Honokane Stream at 775 feet elevation, near Honokane, 1901. Kohala ditch near Koliala, 1901-1913. Kehana ditch at Honokane Mauka, near North Kohala, 1912-13. GAGING- STATION RECORDS. ISLAND OP KAUAI. WAIMEA RIVER NEAR WAIMEA, KAUAI. Location. — ^About 2 miles north of Waimea, 250 feet above ford. Records available. — July 9, 1910, to December 31, 1913. Drainage area. — 58 square miles. Gage. — Vertical and inclined staff. C ontr ol. — Shifting . Discharge measurements. — ^Made from wire suspension bridge or by wading. Diversion. — Greater part of low-water flow diverted by irrigation ditches above station. Accuracy. — ^Records good except for November arid December, when fair results were obtained. Daily discharge, in second-feet, of Waimea River near Waimea, Kauai, for 191S. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. 3.2 6.6 3.2 0.2 12 1.0 34 1.6 373 0.6 283 192 2.2 2.2 42 2.2 1.0 397 1.4 38 .6 246 47 2.2 3.2 14 2.2 186 184 1.1 24 .6 182 7.3 2.2 2.2 2.2 1.6 12 572 1.0 20 65 6.6 2.4 2.2 1.6 1.0 1.0 4.1 545 1.7 76 60 4.1 2.2 2.2 .6 1.0 1.0 4.1 165 1.6 3.3 57 2.8 2.2 2.2 .2 1.0 .2 2.2 151 1.7 1.5 1.8 2.2 2.1 212 .2 .2 .2 2.2 20 1.4 1.2 3,340 2.1 24 5.4 3.2 4.1 .2 1.0 2.2 1.4 1.0 320 2.1 6.1 2.2 2.2 8.3 .1 1,490 2.1 1.6 .9 277 1.8 186 255 1.0 815 .1 357 1.8 1.6 .8 264 6.6 6.6 432 1.0 540 3,340 102 1.5 1.5 .8 78 10,000 489 2.2 .2 320 2,190 47 47 6.6 .8 74 10,000 4.8 2.2 .2 226 780 10 1,150 2.2 1.0 69 9,300 6.6 2.2 .2 320 226 4.1 182 17 .9 65 9,000 30 2.2 .2 5.4 47 2.2 67 3.0 .9 53 8,900 4.4 2.2 1.0 .1 5.4 2.2 19 1.0 47 397 3.2 2.2 1.0 1.0 24 2.2 2.6 14 1.0 42 320 2.6 24 .6 1.0 2.2 3.3 2.2 2.1 3.5 41 306 441 2.2 .2 .2 2.2 2.1 81 1.5 3.2 38 300 6.9 6.6 1.6 255 1.0 1.7 4.1 1.6 1.2 36 296 5.8 4.1 1.0 212 1.0 1.1 3.3 1.6 2.8 540 286 2.2 2.2 .2 199 .2 1.0 2.1 1.4 2.2 1,310 68 2.1 357 1,940 94 .1 3.2 1.2 1.6 1.8 320 52 .4 111 996 47 4.1 1.7 1.1 .3.2 1.7 277 49 2.2 30 270 27 4.1 115 2.1 1.8 1.7 258 47 2.2 6.6 47 12 2.2 34 2.2 1.6 640 76 42 2.2 2.2 22 1.0 1.0 21 2.0 1.5 165 72 38 2.2 6.6 .2 1.0 3.9 1.7 189 158 68 .8 2.1 1.0 .2 1.0 2.4 1.8 62 29 3.5 .8 140 1.0 1.0 1.7 174 3.3 Dec. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24, 25, 26 27 28 29 30 31 0.6 .4 .4 .2 .2 .2 .2 .1 .1 .1 397 255 240 226 221 8.0 8.0 8.3 6.4 6.4 6.4 5.8 5.6 5.4 5.1 4.6 3.5 2.8 2.2 1.6 Note. — No discharge July 17. 28 WATEK RESOTJECES OF HAW AH, 1913. Mcmthly discharge of Waimea River near Waimea, Kauai, for 1913. Month. January February March April May June July August September October November December The year Discharge in second-feet. Maximum. MinimnTn Mean, 489 432 1,940 815 3,340 1,490 1,150 189 640 3,340 10,000 397 10,000 (a) 0.4 2.2 .2 .1 .1 1.0 1.0 .8 .6 .8 .1 (a) 52.6 53.1 50.5 105 215 80.7 117 16.8 51.9 254 1,670 48.4 225 Run-ofl (total in acre-feet). 3,230 2,950 3,110 6,250 13,200 4,800 7,190 1,030 3,090 15,600 99, 400 2,980 163,000 Accu- racy, a Channel dry. KAWAIKOI STREAM NEAR WAIMEA, KAUAI. liOcation. — 8 miles northeast of Knudsen's mountain house, and about 27 miles north of Waimea by horse trail. Records available.— April 3, 1909, to December 31, 1913. Drainage area. — 4.1 square miles. Gage. — Barrett & Lawrence water-stage recorder. Control. — Probably permanent. Discharge measurements,— Made from a wire suspension bridge or by wading. Accuracy. — Records good. Discharge measurements of Kawailoi Stream near Waimea, Kauai, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Apr. 8 May 5 Feet. 1.86 1.80 3.49 Sec. ft. 12.6 8.44 123 Jime 5 July 7 D.E. Homer Feet. ■ 2.28 2.68 Sec. ft. 44.4 W.V.Hardy 50.3 D E. Homer ISLAND OF KAUAI. 29 Daily discharge, in second-feet, of Kawaihoi Stream near Waimea, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 13 23 20 68 23 16 16 14 13 13 13 13 13 13 14 15 14 14 12 11 12 12 12 12 12 12 12 12 14 14 14 14 13 20 24 23 47 22 17 14 13 30 114 63 22 17 15 13 18 33 20 15 13 14 16 14 12 9 9 9 9 9 8 8 7 7 7 11 20 20 12 9 18 22 39 30 98 26 18 11 9 8 7 i 18 19 18 13 22 20 36 34 25 16 8 8 8 8 8 7 7 7 9 9 14 10 8 7 30 17 10 11 14 8 4.5 6 5 4.5 5 5 4 8 7 4.5 4 4 4 74 82 18 13 12 10 7 7 7 6 5 5 5 5 5 5 6.5 12 18 12 11 7 5 4.5 4.5 4.5 69 55 16 12 9 82 27 24 17 80 119 68 21 15 66 109 82 190 75 31 92 152 172 100 44 31 24 28 36 26 2 20 3 10 9 31 4 18 14 14 15 80 5 9 16 23 15 12 10 63 68 53 16 14 16 55 36 15 13 11 10 8 8 8 8 8 8 8 8 8 110 6 127 7 15 32 53 8 50 9 31 10 21 11 18 12 17 16 14 15 15 15 15 17 14 18 14 19 13 12 21 11 22 11 23 11 24 10 25. 10 26 9 27 8 28 8 29 9 30 9 31 • 11 Note.— No records Jan. 1-3, Jan. 8 to Feb. 6, Feb. 9 to Mar. 2, and Mar. 5 to May 4. Monthly discharge of Kawaihoi Stream near Waimea, Kavni, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean, Run-off (total in acre-feet). Accu- racy. May 4-31.. . June July August September. October . . . November. December. . 34 82 190 127 7 4 4 4.5 19.5 15.8 22.1 18.9 10.6 12.2 61.7 26.0 1,040 940 1,360 1,160 631 750 3,670 1,600 The period. 11,200 WAIALAE KIVEE, NEAR WAIMEA, KAUAI. Location. — ^3 miles northeast of F. Gay's mountain house, and about 20 miles north- east of Waimea by horse trail. Records available.— August 1, 1910, to December 31, 1913. Drainage area. — 3.5 square miles. Gage. — Barrett & Lawrence water-stage recorder. Control. — Probaby permanent. Discharge raeasnrements. — Made from cable or by wading. Accuracy. — Records January to August, good; September to December, &ir. 30 WATER EESOUECES OP HAWAH, 1913. Discharge measurements of Waialae River near Waimea, Kauai, in 1913. Date. Hydrographer. Gage heiglit. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Apr. H D. E. Homer Feet. 1.56 1.22 Sec. ft. 28.9 8.83 June 9 D. E. Horner Feet. 1.64 Sec. -ft. 35.9 May 9 do Daily discharge, in second-feet, of Waialae River near Waimea, Kauai, for 1913. Day. 1 2 3 4, 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Jan. 7.2 7.2 7.2 7.2 7.2 7.2 7.2 43 20 50 50 16 122 34 27 32 13 9.5 8.0 7.6 7.2 6.9 6.6 6.0 5.8 5.8 5.2 4.2 3.8 3.5 3.5 Feb. 3.5 3.6 3.9 4.3 4.3 4.3 5.5 34 16 18 36 16 11 9.5 9.1 8.3 8.0 8.0 8.0 8.0 8.0 8.0 7.2 39 20 16 11 9.1 Mar. 8.0 8.0 7.6 7.6 7.6 7.6 7.2 6.6 5.5 5.5 4.2 3.0 3.0 3.0 3.0 3.0 3.0 4.0 4.0 7.2 7.6 17 15 54 62 41 14 11 7.2 6.3 6.3 Apr. 39 21 11 10 7.6 6.9 6.6 6.3 9.1 24 34 20 84 51 93 30 36 44 34 20 18 16 16 16 51 28 18 18 45 41 May. 26 23 38 21 16 15 12 11 7.6 7.2 24 100 70 29 18 17 16 16 16 13 11 10 8.0 7.6 7.2 7.2 7.2 7.2 7.2 7.2 7.2 June. 7.2 6.9 8.3 14 11 11 11 9.1 8.7 36 41 17 15 23 12 11 8.3 7.6 7.2 7.2 7.2 7.2 6.9 6.3 6.3 30 17 18 14 July. 24 50 44 39 50 31 24 24 17 11 9.1 8.0 8.0 14 13 9.9 8.3 8.0 8.3 8.3 9.1 7.6 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 6.9 Aug. 6.9 6.3 6.0 6.0 5.5 5.8 6.3 6.9 7.2 7.2 7.2 7.2 10 15 17 24 17 16 10 8.0 7.6 7.2 7.2 6.6 6.9 6.3 17 Sept. 30 41 31 13 11 11 11 10 7.2 7.2 6.0 5.8 5.8 5.8 5.8 5.8 5.8 5.8 5.8 5.8 5.8 5.5 5.5 5.2 4.9 4.3 4.0 6.0 ,5.5 5.5 Oct. 5.5 5.2 4.3 4.3 4.3 4.3 5.8 105 26 11 10 9.1 57 36 26 20 15 14 26 19 16 17 31 23 30 22 28 14 13 11 8.0 Nov. 7.6 8.0 30 11 108 122 126 24 21 23 24 17 70 63 18 25 60 58 61 43 11 18 50 72 Dec. 18 11 10 13 23 48 15 10 8.0 8.0 7.2 7.2 7.2 6.3 4.9 4.3 4.3 5.5 5.5 5.5 5.8 5.2 4.9 4.9 5:5 5.5 6.2 5.8 6.3 6.3 6.6 Monthly discharge of Waialae River near Waimea, Kauai, for 1913. Month. Discharge in second-feet. Exm-ofl (total in acre-feet). Accu- Maximum. Mi'Tn'mnm, Mean. racy. January 122 39 62 93 100 41 50 68 41 105 126 48 3.5 3.5 3.0 6.3 7.2 6.3 6.9 5.5 4.0 4.3 7.6 4.3 17.5 12.1 11.3 28.5 18.8 13.2 15.8 12.2 9.43 20.0 39.6 9.16 1,080 672 695 1,700 1,160 786 972 750 561 1,230 2,360 563 A. February A. March A. April A. May A. .Timpi A. July A. August A. September B. October B. November ... B. December B. The year 126 3.0 17.3 12,500 ISLAND OF KAUAI. 31 WAIMEA DITCH NEAR WAIMEA, KAUAI. Location. — ^About 4 milea north of Waimea and 300 feet below intake. Records available. — November 4, 1911, to September 30, 1913. Gage. — ^Vertical staff. Control. — Fairly permanent. Discharge measurements. — ^Made from a footbridge. Diversion. — Ditch diverts part of flow of Waimea River. Accviracy. — Records poor. Monthly discharge of Waimea ditch near Waimea, Kauai, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. January February. . March April May Jime July August September. 12.1 15.3 10.6 27.5 13.7 16.1 16.1 15.3 12.1 1.9 1.5 1.0 2.4 3.2 2.4 1.5 2.0 1.7 4.97 4.21 3.84 7.93 5.61 6.25 7.16 4.73 4.02 The period. 306 234 236 472 345 372 440 291 239 2,940 MAKAWELI RIVER NEAR WAIMEA, KAUAI. Location. — About 2 miles northeast of Waimea. Reached by wagon road up Maka- weli River. Records available. — October 6, 1911, to December 31, 1913. Drainage area. — 25.8 square miles. Gage. — Vertical staff. Control. — Probably slightly shifting. Discharge measurements. — Made from a wire suspension footbridge or by wading. Diversions. — Several above station. Accuracy. — Records fairly good except for November and December, when they were poor. The following discharge measurement was made by W. V. Hardy: April 30, 1913: Gage height, 4.46 feet; discharge, 195 second-feet. 32 WATER EESOUECES OF HAWAII^ 1913. Daily discharge, in second-feet, of Makaweli River near Waimea, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. 14 15 17 55 39 6 22 10 30 24 82 14 14 17 14 9 6 24 12 26 34 80 13 14 14 12 6 226 72 11 24 25 78 3 13 11 12 84 34 47 10 24 50 80 3 13 11 8 13 14 55 10 17 44 69 17 12 11 6 19 11 23 8 16 37 70 14 10 10 6 17 6 18 8 16 35 74 10 9 10 6 8 6 17 9 16 621 74 10 8 10 55 8 6 18 8 15 320 84 3 84 10 15 6 39 18 8 14 260 93 190 32 10 10 6 17 18 7 13 82 3,160 26 26 10 26 1,280 15 18 7 13 78 1,920 2,660 20 6 383 190 15 18 7 12 72 255 84 20 6 84 39 17 19 6 12 74 166 84 19 6 126 34 17 19 6 11 148 154 143 17 6 84 20 14 18 6 10 143 118 84 17 19 34 19 11 18 7 10 190 106 26 14 9 21 14 12 18 7 11 98 135 26 14 9 20 14 10 18 7 12 93 139 14 17 13 19 12 11 18 6 11 82 143 14 26 12 19 6 10 16 6 10 80 135 14 20 36 14 6 10 15 6 10 76 139 13 20 10 10 14 9 8 7 10 78 150 13 19 44 11 10 9 7 7 11 75 154 14 84 122 14 11 9 7 6 10 ■ 74 5,170 19 55 39 14 10 8 7 6 9 72 1,790 17 26 10 13 10 247 8 6 4 75 289 19 20 8 6 6 104 9 6 6 80 232 19 6 122 6 16 7 6 6 80 202 17 6 84 6 58 8 70 4 81 13 14 6 6 8 74 81 Dec. 1 2 3, 4 5. 6 7, 8. 9. 10. 11. 12. 13 14 15. 16. 17. 18 19. 20 21 22. 23. 24 25 26 27 28 29 30 31 Monthly discharge of Makaweli River near Waimea, Kauai, for 1913. Month. Discliarge in second- feet. Maximum. MiTn'm nm Run-off (total in acre-feet). Accu- racy. January Februarj- March April May June July August September October November December The year 2,660 84 122 383 1,280 247 72 74 30 621 5,170 13 5,170 116 23.5 16.6 43.4 62.2 32.4 19.2 11.6 13.1 108 512 7.81 80.3 7,130 1,310 1,020 2,580 3,820 1,930 1,180 713 780 6,640 30,500 480 58, 100 HALEKUA STREAM NEAR WAIMEA, KAUAI. Location. — Station is reached from Waimea via Gay's mountain house by saddle horse; requires two days to make round trip. Records available. — October 11, 1912, to December 18, 1913. Drainage area. — 0.5 square mile. Gage. — Barrett & Lawrence water-stage recorder. Control. — Probably permanent. Discharge measurements.- — Made by wading. Accuracy. — Records fair. Cooperation. — Station maintained in cooperation with Hawaiian Sugar Co. ISLAND OF KAUAI. 33 Discharge measurements of Halekua Stream near Waimea, Kauai, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. June 10 D E Homer Feet. 3.90 3.36 Sec.-ft. 10.8 .65 Oct. 12 W. V. Haxdy. . . Feet. 3.50 Sec.-ft. 1.68 Sept. 11 do Daily discharge, in second-feet, of Halekua Stream near Waimea, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 2.2 1.9 1.9 1.9 1.9 2.0 2.0 1.8 1.6 1.5 1.4 1.2 ' 1.1 1.1 1.2 1.4 1.7 1.9 2.5 4.0 3.3 5.0 7.5 9.2 12 5.0 4.3 3.5 3.2 2.9 9.2 7.8 4.3 4.5 3.3 3.0 2.7 2.6 3.3 5.5 5.8 4.0 3.5 22 8.2 11 4.2 6.0 5.0 5.8 3.3 3.3 2.9 3.3 4.0 8.6 3.5 3.3 7.0 7.5 6.0 3.8 9.2 4.2 3.5 3.3 3.3 3.3 3.0 2.6 2.6 20 19 13 4.2 5.8 3.8 3.6 4.2 2.9 2.7 2.6 2.6 2.5 2.6 2.6 2.5 2.5 2.5 2.5 2.5 2.6 2.2 5.0 4.7 3.0 2.9 1.0 2 3 19 4 1.5 1.5 2.3 3.3 5.0 5.0 35 53 1.4 5 3.0 6 2.7 7 1.4 8 2.5 2.7 2.3 2.0 2.3 2.7 3.3 3.0 3.8 1.9 1.3 1.2 9 .8 10 .8 11 8.9 3.3 4.2 3.5 3.3 2.7 2.5 2.9 0.8 .8 .8 2.9 2.0 9.2 2.7 1.5 1.4 1.4 2.2 1.7 1.3 1.0 1.7 1.9 1.5 3.0 .7 12 1.9 1.9 1.9 1.8 1.7 1.7 1.8 1.8 1.8 1.9 1.9 4.2 4.2 3.0 2.7 2.6 2.5 .6 13 .6 14 .6 15 .6 16 .6 17 .6 18 .6 19 20 . 2.6 2.6 2.6 2.3 2.5 2.5 2.3 2.2 1.9 2.0 2.0 1.9 21 22 23 24 25 27 28 1.0 .8 .8 29 31 Note. — No record for days for which discharge measurements are not given. OLOKELE DITCH AT T ^^NNEL NO. 12, NEAR MAKAWELI, KAUAI. Location.! — About 10 miles nonheast of Makaweli. Records available.— July 24, 1904, to December 31, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements.^ — Made from a plank across ditch. Diversion. — Ditch diverts all low-water flow of Olokele River. Accuracy. — Records excellent. Cooperation. — Gage-height records furnished by Hawaiian Sugar Co. Discharge measurements of Olokele ditch at tunnel 12, near Makaweli, Kauai, in 1913. Date. Hydrographer. Gage height. Dis- charge. Sec.-ft. 95.9 86.0 Date. Hydrographer. Gage height. Dis- charge. Apr. 27 W. V. Hardy Feet. 3.54 3.24 Apr. 27 June 27 W. V. Hardy Feet. 3.04 3.84 Sec.-ft. 78.9 27 do do 106 1 Described in U. S. Geol. Survey Water-Supply Paper 336 as about "12 miles northeast of "Waimea." 97764°— wsp 373—15 3 34 WATER EESOUECES OP HAWAII^ 1913. Daily discharge, in second-feet, of Olokele ditch at tunnel 12, Mahaweli, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. 64 51 51 105 81 51 105 51 91 55 47 55 51 51 101 105 47 105 58 72 51 51 51 51 51 75 97 41 105 51 72 47 88 51 47 51 72 81 41 105 51 61 47 61 51 51 51 64 61 41 105 47 61 44 68 47 51 51 58 55 105 78 47 72 105 105 51 97 55 55 68 84 88 64 61 75 51 101 78 55 51 94 61 68 78 55 106 88 91 55 51 55 64 91 61 97 68 106 101 101 51 51 68 58 105 55 55 55 68 94 101 88 47 97 51 97 55 55 51 61 105 101 58 47 64 88 64 51 51 68 68 61 101 55 47 105 105 94 105 78 61 105 105 101 51 47 101 78 78 72 84 51 94 101 91 51 47 105 64 94 72 68 61 84 105 91 58 55 84 68 101 64 58 55 97 105 72 51 94 105 64 58 58 58 51 68 106 61 51 61 97 97 55 55 55 51 55 76 58 72 72 101 61 75 58 51 51 64 105 55 55 97 75 55 55 64 51 47 61 105 58 68 91 72 51 97 55 105 47 51 94 58 75 68 51 55 61 56 55 51 78 57 61 64 64 51 68 55 55 47 61 78 55 101 97 72 51 72 68 51 47 61 105 54 72 101 105 58 75 105 101 47 64 105 52 55 ,97 84 68 105 105 72 47 58 105 51 44 68 68 51 72 81 58 47 58 105 51 55 78 64 64 75 61 68 55 68 75 51 61 105 51 75 105 105 51 61 68 51 58 101 97 105 58 105 47 47 22 58 61 55 55 105 47 Dec. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 38 61 64 68 68 105 68 55 55 51 51 51 51 51 51 65 47 51 61 61 47 51 47 47 47 47 47 47 47 47 47 Monthly discharge of Olokele ditch at tunnel 12, near Mahaweli, Kavxii, for 1913. Month. January Februarj^ March April May June July August September ' October November December The year Discharge in second-feet. Maximum. Minimum. Mean 101 101 101 105 105 105 105 105 91 105 105 105 67.5 68.2 64.0 81.4 68.8 74.6 75.4 67.6 56.2 66.0 86.4 53.7 68.2 Run-off (total in acre-feet). 4,160 3,230 3,940 4,840 4,230 4,440 4,640 4,150 3,340 4,060 5,080 3,300 49, 400 Accu- racy. ISLAND OF KAUAI. 35 OLOKELE DITCH AT WEIR, NEAR MAKAWELI, KAUAI.^ Location. — About 7 miles nortlieast of Makaweli and about 3 miles below tmmel No. 12 on the same ditch. Records available. — January 1, 1910, to December 31, 1913. Gage. — Vertical staff; zero on gage is equal to crest of weir. Discharge measttrements. — Made from plank over ditch. Discharge computed by Francis formula for a 12-foot weir with end contractions; computations checked by current-meter measurements. Diversion. — Ditch diverts all of low-water flow of Olokele River. Accuracy. — Records good. Cooperation. — Records are furnished by the Hawaiian Sugar Co. Discharge measurements of Olokele ditch at weir, near Makaweli, in 1913. Date. Feb. 14 14 Hydrographer. W. V. Hardy. do height. Feet. 2.21 2.21 Dis- charge. Sec.-ft. 51. 51. Daily discharge, in second-feet, of Olokele ditch at weir, near Makaweli, Kauai, for 1913. Day. 1 2 3 4 5 6 7 8 9 10 11 12 13 14, 15 16 17, 18, 19 20, 21 22 23 24 25 26 27 28, 29 30 31 Jan. 73.4 89.3 89.3 95.8 87.6 82.9 76.5 90.9 86.0 74.9 64.4 57.3 57.3 60.1 64.4 55.8 51.7 50.4 47.7 47.7 49.0 47.7 49.0 51.7 50.4 49.0 50.4 57.3 67.3 61.5 57.3 Feb. 58.7 54.5 64.5 73.4 65.9 60.1 49.0 49.0 51.7 50.4 51.7 68.9 64.4 65.9 60.1 60.1 64.4 68.9 57.3 51.7 50.4 49.0 47.7 47.7 47.7 47.7 50.4 74.9 Mar. 73.4 58.7 60.4 47.7 49.0 49.0 51.7 60.4 49.0 60.1 74.9 76.5 78.0 82.9 86.0 82.9 76.5 76.5 78.0 82.9 84.5 82.9 82.9 90.9 94.2 84.5 79.6 67.4 64.4 67.4 84.5 Apr. 87.6 79.6 82.9 70.3 67.3 61.7 60.4 66.8 76.6 78.0 79.6 94.2 95.8 89.3 82.9 90.9 87.6 81.2 65.9 66.9 63.0 71.9 74.9 89.3 71.9 71.9 86.0 92.5 90.9 82.9 92.5 90.9 70.3 58.7 70.3 78.0 74.9 68.7 68.7 81.2 89.3 89.3 68.9 68.9 64.4 74.9 68.9 67.3 51.7 49.0 47.7 61.7 67.4 65.8 53.1 57.3 54.5 57.3 58.7 50.4 June. 47.7 57.3 47.7 40.0 43.8 74.9 63.0 67.4 84.5 84.5 73.4 70.3 89.3 79.6 73.4 67.4 68.7 67.3 60.1 63.0 60.1 57.3 61.5 60.1 86.0 84.5 87.6 82.9 73.4 90.9 July. 95.8 99.1 101 99.1 87.6 78.0 70.3 61.5 57.3 64.5 54.5 61.5 76.6 70.3 64.4 63.0 58.7 57.3 64.4 58.7 64.6 54.6 57.3 67.4 74.9 79.6 67.4 61.5 67.4 56.8 61.7 Aug. 58.7 63.1 47.7 46.4 47.7 51.7 66.9 66.9 61.6 65.8 50.4 74.9 76.5 76.6 60.1 61.5 53.1 50.4 50.4 64.5 61.6 54.5 55.8 68.9 64.4 71.9 87.6 87.6 82.9 84.5 Sept. Oct. Nov. 79.6 46.1 42.5 67.4 49.0 42.5 64.4 45.1 70.3 57.3 42.6 64.4 64.4 41.2 61.5 70.3 46.4 63.0 61.6 70.3 61.6 63.1 86.0 61.6 61.7 90.9 65.9 47.7 82.9 90.9 47.7 68.9 92.5 49.0 65.9 86.0 46.1 67.4 89.3 45.1 86.0 87.6 47.7 90.9 86.0 46.4 73.4 90.9 45.1 61.5 90.9 45.1 53.1 87.6 43.8 58.7 92.6 43.8 53.1 99.1 49.0 47.7 92.6 46.4 50.4 86.0 42.5 55.8 92.6 42.5 53.1 97.6 41.2 55.8 99.1 41.2 54.5 101 40.0 50.4 92.6 42.6 50.4 78.0 68.7 60.4 70.3 47.7 46.1 43.8 53.1 Dec. 41.2 47.7 64.4 73.4 70.3 76.5 79.6 58.7 60.4 49.0 47.7 47.7 47.7 47.7 47.7 46.4 46.4 46.4 47.7 47.7 47.7 49.0 46.4 46.1 46.1 45.1 45.1 45.1 43.8 43.8 43.8 1 Described in U. S. Geol. Survey Water-Supply Paper 336 as about 8 miles northeast of Waimea. 36 WATER EESOUECES OF HAWAII, 1913. Monthly discharge of Olokele ditch at weir, near Makaweli, Kauai, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean. Rim-off (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 95.8 74.9 94.2 95.8 92.5 90.9 101 87.6 79.6 90.9 101 79.6 47.7 47.7 47.7 50.4 47.7 40.0 51.7 46.4 40.0 41.2 42.5 41.2 64.0 57.0 71.5 77.3 66.2 68.2 68.6 62.9 50.9 59.2 79.6 51.1 101 40.0 64.8 3,940 3,170 4,400 4,600 4,070 4,060 4,220 3,870 3,030 3,640 4,740 3,140 46,900 POOWAIOMAHAIHAI DITCH NEAR WAIMEA, KAUAI. Location. — About 110 feet below bridge station on Makaweli River, 250 feet below intake, and about 2 miles northeast of Waimea. Records available.— October 27, 1911, to September 30, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — ^Made from timber bridge 15 feet above gage. Diversion. — Ditch diverts part of flow of Makaweli River. Accuracy. — Records good. The following discharge measurement was made by W. V. Hardy: April 30, 1913: Gage height, 1.67 feet; discharge, 13.5 second-feet. Daily discharge, in secondfeet, of Pooivaiomahaihai ditch near Waimea, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. 4.3 6.2 7.3 8.5 7.3 3.5 6.5 5.7 4.3 6.2 7.3 5.2 4.3 2.8 6.8 6.1 4.3 6.2 7.3 3.5 4.3 8.5 7.2 6.0 3.5 5.2 6.2 3.5 8.5 7.3 6.8 5.8 3.5 5.2 6.2 2.8 4.3 5.2 6.2 5.7 4.3 5.2 6.2 2.8 6.2 4.3 6.1 5.5 4.3 5.2 5:2 2.8 6.2 3.5 5.9 5.5 5.2 5.2 5.2 2.8 4.3 3.5 5.7 5.4 5.2 4.3 5.2 8.5 4.3 3.5 5.9 5.2 3.5 13 5.2 4.3 3.5 7.3 5.8 5.2 3.5 7.3 5.2 3.5 3.5 5.2 5.8 5.1 7.3 7.3 5.2 7.3 25 5.2 5.7 4.9 39 6.2 4.3 18 8.5 4.3 5.8 4.9 14 7.3 4.3 8.5 7.3 3.5 5.9 4.8 18 7.3 4.3 9.8 7.3 3.5 5.9 4.6 18 7.3 4.3 8.5 6.2 3.5 5.8 4.6 13 7.3 7.3 7.3 6.2 5.4 5.8 4.6 6.2 7.3 4.3 6.2 5.2 5.2 5.8 4.6 6.2 6.2 4.3 7.3 5.2 5.2 5.7 4.6 4.3 7.3 5.2 6.2 5.2 5.3 5.7 4.5 4.3 8.5 5.2 6.2 3.5 5.3 5.5 4.5 4.3 7.3 7.3 6.2 3.5 5.4 5.3 4.6 5.2 7.3 4.8 5.2 5.2 5.2 5.0 4.8 5.2 7.3 6.2 5.2 4.3 5.1 4.8 4.8 4.3 9.8 9.8 6.2 4.3 5.1 4.8 4.6 5.2 8.5 6.2 5.2 4.3 4.9 5.0 4.6 4.3 7.3 4.8 5.2 3.5 12 5.1 4.6 5.2 7.3 4.3 4.3 3.5 10 5.0 4.5 4.3 3.5 8.5 3.5 6.5 5.2 4.5 4.3 3.5 7.3 3.5 10 5.3 7.0 4.3 3.5 3.5 5.2 7.2 Sept. 1 2 3 4 5 6 7 8 9 10 11, 12, 13 14 15, 16 17, 18, 19, 20, 21, 22 23, 24, 25 26 27 28 29 30 31 8.4 7.9 7.5 6.8 6.2 6.0 6.0 6.1 5.9 5.7 5.5 5.5 5.3 5.3 5.2 5.1 4.9 5.2 5.3 5.2 5.1 5.1 5.0 5.2 4.9 5.9 5.7 6.2 6.1 5.6 ISLAND OF KAUAI. 37 Monthly discharge of Pooivaimahaihai ditch near Waimea, Kauai, for 19 IS. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. January February March April May June July August September The period 39 13 9.8 18 25 12 7.2 7.2 8.4 3.5 4.3 3.5 2.8 3.5 2.8 4.8 4.5 4.9 7.20 6.99 5.45 6.23 5.66 5.53 5.71 5.13 5.79 443 388 335 371 348 329 351 315 345 3,220 HANAPEPE RIVER AT KOULA, NEAR ELEELE, KAUAI. Location. — About 5 miles north of Eleele. Records available. — August 18, 1910, to December 31, 1913. Drainage area. — 12.6 square miles. Gage. — Friez water-stage recorder. Control. — Fairly permanent. Discharge measurements. — ^Made from cable or by wading. Diversions. — Nearly all low-water flow diverted above station. Accuracy. — Records fair. The following discharge measurement was made by D. E. Horner: October 14, 1913: Gage height, 1.56 feet; discharge, 46.3 second-feet Daily discharge, in secondfeet, of Hanapepe River at Koula, near Eleele, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. 24 16 13 78 55 14 87 67 51 15 14 20 16 13 40 174 25 277 30 72 13 29 19 16 13 39 95 357 105 14 40 12 18 18 15 13 29 58 108 118 13 16 12 13 18 17 13 18 27 84 138 12 15 12 14 19 50 13 14 40 38 50 13 43 53 20 20 55 21 14 54 36 36 18 20 66 14 165 36 16 16 80 20 23 17 14 420 13 50 17 13 55 32 46 22 14 14 196 94 180 32 13 20 25 38 20 13 13 56 171 142 33 13 20 142 64 18 12 13 76 442 142 16 13 15 246 24 17 26 13 53 603 459 14 13 243 266 48 60 25 13 121 453 129 14 13 149 117 40 23 23 13 63 126 264 14 13 142 67 34 22 15 14 43 88 120 18 14 41 36 44 22 13 13 34 92 59 15 23 112 38 19 18 13 12 22 61 63 25 16 72 56 23 18 12 12 29 52 75 30 20 87 22 25 20 12 13 15 298 24 29 22 30 IS 18 36 12 12 14 343 29 19 22 24 17 26 18 32 12 18 125 72 16 36 20 17 18 16 13 12 43 130 43 16 35 38 16 20 15 12 12 30 167 80 48 28 18 26 16 17 13 12 60 184 34 18 76 221 16 20 41 24 12 88 352 20 14 67 57 13 57 68 18 12 72 246 19 13 30 33 14 120 25 15 12 52 132 17 13 24 29 14 92 15 43 26 34 86 16 29 82 14 36 29 143 12 15 363 16 18 142 101 78 14 38 12 15 225 20 22 24 14 123 15 Dec. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21 22 23 24 25 26 27 28 29 30 31 38 WATER RESOURCES OF HAW AH, 1913. Monthly discharge of Hanapepe River at Koula, near Eleele, Kauai. Month. Discharge in second-feet. Maximum. Mi-m'Tm iTn, Mean. Run-off (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 459 243 266 357 277 143 72 420 603 126 76.6 22.7 22.2 63.3 61.9 52.9 45.2 27.4 18.7 57.0 166 27.1 53.4 4,710 1,260 1,360 3,770 3,810 3,150 2,780 1,680 1,110 3,500 9,880 1,670 38, 700 HILOA DITCH AT HANAPEPE FALLS NEAR ELEELE, KAUAI. Location. — ^About 8 miles north of Eleele and 335 feet below intake, which is just above confluence of the main and east branches of Hanapepe River. Records available. — November 22, 1911, to December 31, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made from plank across ditch at gage. Diversion. — Ditch diverts all low-water flow from the main branch of Hanapepe River above Hanapepe Falls. Accuracy. — Records good. Discharge measurements of Hiloa ditch at Hanapepe Falls, near Eleele, Kauai, in 1913. Date. Hydrographer. Gage height. Dis- charge. June 21 Oct. 14 W. V. Hardy . D. E.Horner. Feet. 2.09 2.18 Sec.-ft. 41.1 45.5 ISLAND OF KAUAI. 39 Daily discharge, in second-feet^ of Hiloa ditch at Hanapepe Falls, near Eleele, Kauai, for 1912-lS. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1912. 1 34 35 35 34 50 38 41 44 44 40 35 35 39 29 35 33 32 32 31 43 37 31 56 18 26 26 26 28 31 30 33 39 37 34 33 33 33 33 66 39 48 52 4G 40 41 49 37 37 22 "o 42 42 50 43 44 45 40 36 35 34 33 34 31 31 30 30 29 29 29 29 29 32 30 29 28 28 28 28 29 28 28 28 29 40 50 39 36 34 32 31 30 32 32 31 32 34 39 46 45 44 43 41 35 32 31 31 30 30 39 47 37 37 33 38 43 33 31 30 29 37 31 32 33 30 36 32 31 50 54 68 42 45 43 40 40 40 40 35 35 34 35 31 36 42 33 31 30 30 29 33 29 28 28 28 28 28 46 29 28 28 28 27 27 28 27 40 62 31 34 41 40 61 44 38 53 62 40 40 52 48 43 29 29 28 37 31 30 37 44 43 40 39 36 33 32 32 32 40 39 32 47 46 44 44 32 55 38 35 33 31 30 47 46 48 42 37 34 31 33 52 37 36 33 38 44 45 39 45 42 42 45 48 37 48 37 35 40 44 48 48 45 29 30 43 53 44 34 34 45 35 31 31 32 32 44 45 38 32 31 30 30 34 44 46 49 39 44 48 39 34 42 40 48 43 44 44 43 41 48 50 46 40 44 47 52 18 39 39 41 40 40 37 35 34 32 48 40 32 37 37 34 44 39 36 34 33 39 37 35 32 33 32 31 32 31 54 44 46 39 32 41 44 37 60 43 46 49 40 34 36 32 31 30 36 32 48 14 14 44 42 44 46 44 45 40 46 46 46 45 38 40 41 34 46 42 38 33 46 46 53 42 41 40 37 32 30 38 46 31 31 31 31 43 53 42 48 46 43 44 -52 41 40 40 40 39 39 51 39 38 36 34 33 . 36 32 43 44 44 45 46 44 41 39 41 38 34 34 35 36 37 43 34 32 33 34 34 32 31 35 42 46 40 34 44 33 32 32 31 30 32 35 34 45 45 52 36 34 32 32 55 38 37 33 32 31 31 31 40 31 39 38 38 38 41 40 42 40 30 38 35 32 31 34 37 36 38 34 30 45 40 38 35 31 30 30 28 29 44 34 30 37 44 39 32 36 48 42 41 40 41 40 37 38 35 40 40 40 36 34 35 34 32 37 42 36 31 36 33 32 32 31 30 29 29 28 30 36 42 40 40 42 39 ^42 43 - 38 34 35 31 30 35 30 31 32 29 29 29 29 28 ■ 28 29 28 27 27 27 27 28 28 28 44 30 39 30 31 32 34 41 33 36 30 31 32 33 31 30 47 35 52 50 48 44 42 36 34 52 49 46 43 46 44 29 28 27 27 38 48 41 45 44 42 42 43 44 39 42 45 38 37 35 33 32 31 38 38 33 40 33 31 31 40 35 34 32 54 43 35 46 46 40 36 33 31 30 30 29 39 49 33 31 34 46 64 42 31 29 29 28 32 45 32 34 37 31 31 42 35 30 38 45 46 39 39 37 40 38 37 37 39 • 39 37 40 40 41 44 35 33 31 31 26 54 2 62 3 42 4 42 5 42 6 41 7 40 8' 42 9 43 10 40 11 37 12 36 13 36 14 33 15 34 16 34 17 32 18 31 33 20 44 21 61 62 23 63 24 60 25 46 26 42 39 28 40 39 30 38 41 1913. 1 19 2 19 3 18 18 5 38 6... 38 8 36 35 10 35 11 36 12 34 13 34 14 33 15 32 16 31 17 32 18 33 32 20 . . 31 21 31 22 31 23 30 30 25 28 26 30 29 28 29 29 29 30 29 31 30 Note.— Gage not read on Sundays; discharge estimated. 40 WATEE RESOURCES OF HAWAII, 1913. Monthly discharge of Hiloa ditch at Hanapepe Falls, near Eleele, Kauai, for 19i2~13. Month. Discharge in second-feet. Maximum. Minimum. Mean, Run-o£E (total in acre-feet). Accu- racy. 1912. January February March April May June July August September October November December The year 1913. January February March April May June July August September October November December The year 63 56 34.9 31.1 37.0 36.6 38.1 37.8 39.2 36.9 35.2 38.8 37.2 42.5 2,150 1,790 2,280 2,180 2,340 2,250 2,410 2,270 2,090 2,390 2,210 2,610 18 37.2 27,000 38.3 35.9 36.6 41.5 40.5 40.4 38.1 35.7 32.1 34.6 36.7 29.3 2,360 1,990 2,250 2,470 2,490 2,400 2,340 2,200 1,910 2,130 2,180 1,800 36.5 26, 500 Note. — Jan. 18, 1913: Gates closed at noon and not opened until the 20th; practically no flow for this period. May 14, June 4 and 5, 1913, Discharge affected by regulation. Oct. 25-26, no water in ditch; turned in at 4.15 p. m. Oct. 27. Dec. 7, 1913, no water in ditch. HANAPEPE DITCH AT KOULA, NEAR ELEELE, KAUAI, Location. — About 4 miles north of Eleele and about 4 miles below Hanapepe Falls. Records available. — ^January 1, 1910, to December 31, 1913. Gage. — ^Vertical staff. Control. — Probably permanent. Discharge measuremonts. — ^Made from cross timber of flume. Diversions. — Ditch diverts all low-water flow of East Branch of Hanapepe River. Accuracy. — Records good. Cooperation. — Gage-height records furnished by Hawaiian Sugar Co. The following djischarge measurement was made by W. V. Hardy. June 22, 1913: Gage height, 2.84 feet; discharge, 46.2 second-feet. ISLAND OF KAUAI. 41 Daily discharge, in second-feet, of Hanapepe ditch at Koula, near Eleele, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dee. 1 50 48 46 44 44 44 44 52 52 52 52 52 52 52 52 52 52 17 34 52 52 52 52 52 52 52 50 48 45 42 36 57 44 44 43 48 50 52 46 45 52 48 45 43 43 43 41 45 52 44 44 45 46 52 44 39 42 40 39 38 37 37 36 36 36 46 38 37 36 34 34 84 34 33 33 51 39 46 49 52 52 49 52 52 52 51 52 52 52 41 52 52 52 52 48 43 41 41 44 50 52 42 52 52 52 49 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 51 52 52 52 52 52 52 48 50 51 52 52 52 52 52 50 50 48 45 44 49 46 46 44 47 52 52 49 46 43 45 47 48 50 52 51 51 51 51 51 51 51 51 51 50 47 51 45 51 45 46 47 48 51 48 46 51 51 51 51 51 51 51 51 51 51 51 46 46 45 51 50 49 46 48 48 44 46 46 44 39 45 51 51 51 45 50 43 40 38 51 44 41 40 39 50 50 46 28 28 38 51 51 47 40 38 37 36 27 51 43 38 38 50 49 39 44 51 51 51 51 51 51 50 51 51 51 45 44 40 39 43 36 38 41 36 35 37 38 44 33 35 33 33 32 31 32 48 44 33 37 34 33 30 29 49 49 52 51 50 50 51 51 50 50 50 48 46 43 42 39 40 51 51 50 48 47 46 42 39 40 38 46 47 40 40 51 39 37 49 51 51 51 48 52 52 52 52 52 52 51 49 52 52 52 39 32 34 34 69 104 93 2 3 82 71 4 60 5 49 6 50 7 43 8 36 9 ... 36 10 37 11 44 12 44 13 44 14 44 15 43 16 42 17 42 18 43 19 42 20 41 21 41 22 . . . . 41 23 40 24 40 25 40 26 39 27 39 28 38 29 30 38 38 39 Note. — Discharge interpolated for Sundays and holidays when no readings were made. Monthly discharge of Hanapepe ditch at Koula, near Eleele, Kauai, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-oflf (total in acre-feet). Accu- racy. January February March AprU May June July August September October November December The year 52 57 52 52 52 52 51 51 51 52 104 93 47.6 45.6 42.6 50.1 50.0 48.9 47.8 42.7 40.9 44.8 48.9 45.8 2,930 2,530 2,620 2,980 3,070 2,910 2,940 2,630 2, 430 2,750 2,910 2,820 4. 3 33,500 HANAPEPE DITCH AT WEIR NEAR HANAPEPE, KAUAI. Location.— About 2J miles northeast of Hanappe at measuring weir maintained by Hawaiian Sugar Co., on the Hanapepe ditch below the last siphon across Hanapepe River. Records available. — ^January, 1910, to December 31, 1913; records show amount of water delivered by the ditch at the cane fields. Gage. — Vertical staff on right bank; zero on gage equals crest of weir. Control. — Probably permanent. Discharge measurements. — Computed from formula for a 12-foot, sharp-crested weir with end contractions; checked by current-meter measurements. Cooperation. — Gage-height records furnished by Hawaiian Sugar Co. 42 WATEE EESOUECES OF HAWAH^ 1913. Daily discharge, in second-feet, of Hanapepe ditch at weir near Hanapepe, Kauai, for 19 tS. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 46.4 46.4 45.1 43.8 42.5 42.5 42.5 45.1 46.4 45.1 42.5 43.8 45.1 45.1 46.4 47.7 47.7 28.2 43.8 41.2 41.2 40.0 41.2 42.5 45.1 46.4 45.1 43.8 46.4 46.4 42.5 41.2 41.2 41.2 40.0 41.2 43.8 45.1 45.1 42.5 42.5 42.5 43.8 41.2 40.0 37.0 36.3 35.2 35.2 34.0 32.8 32.8 35.2 38.8 36.3 34.0 32.8 31.6 31.6 31.6 31.6 -32.8 34.0 40.0 41.2 42.5 43.8 43.8 43.8 42.5 42.5 43.8 41.2 43.8 42.5 40.0 40.0 41.2 41.2 42.5 41.2 41.2 37.5 36.3 35.2 35.2 37.5 37.5 38.8 38.8 41.2 42.5 42.5 42.5 42.5 42.5 42.5 42.5 41.2 41.2 41.2 40.0 41.2 41.2 41.2 42.5 42.5 41.2 41.2 41.2 40.0 30.4 37.5 41.2 41.2 41.2 41.2 37.5 40.0 27.1 30.4 46.4 46.4 46.4 45.1 43.8 42.5 42.5 42.5 43.8 42.5 42.5 41.2 41.2 41.2 43.8 45.1 42.5 40.0 ""45.'i' 46.4 45.1 46.4 46.4 46.4 45.1 45.1 45.1 45.1 45.1 45.1 43.8 42.5 43.8 42.5 42.5 41.2 41.2 43.8 43.8 41.2 34.0 45.1 45.1 45.1 46.4 45.1 45.1 45.1 45.1 42.5 42.5 41.2 40.0 40.0 40.0 41.2 41.2 41.2 41.2 38.8 37.5 40.0 40.0 38.8 37.5 37.5 38.8 41.2 41.2 41.2 40.0 41.2 38.8 37.5 38.8 42.5 42.5 38.8 38.8 40.0 41.2 40.0 38.8 37.5 37.5 38.8 41.2 41.2 38.8 36.3 34.0 32.8 32.8 36.3 37.5 36.3 34.0 35.2 38.8 38.8 38.8 40.0 42.5 43.8 43.8 43.8 43.8 43.8 42.5 42.5 43.8 42.5 40.0 40.0 37.5 36.3 3.5.2 35.2 35.2 35.2 34.0 32.8 35.2 34.0 32.8 32.8 31.6 30.4 30.4 30.4 30.4 31.6 35.2 32.8 34.0 35.2 32.8 30.4 30.4 35.2 40.0 43.8 45.1 45.1 46.4 46.4 46.4 45.1 38.8 42.5 43.8 40.0 19.8 35.2 38.8 38.8 41.2 42.5 23.9 "so." 4' 40.0 40.0 40.0 40.0 40.0 41.2 40.0 41.2 42.5 40.0 42.5 46.4 46.4 46.4 49.0 49.0 45.1 40.0 46.4 47.7 49.0 47.7 46.4 "46.' 6' 37.5 36.3 36.3 35.2 2 . . 3 4 5.. . . 6 40 7 8 21 8 9 36 3 10 11 37.5 38 8 12 13 41.2 42 5 14 42 5 15 42 5 16... 42 5 17 41 2 18 19 40.0 41 2 20 32.8 47.7 47.7 47.7 42.5 23.9 47.7 47.7 46.4 45.1 43.8 43.8 40 21 . 41 2 22 23 41.2 40.0 24 25 40.0 40 26 40 27 38.8 28 29 38.8 37 5 30 31 36.3 35.2 Note.— Ditch dry Jan. 19; May 14-15; June 4-6; Oct. 26-28; Nov. 22-24 and 30; Dec. 1-5 and 7. Monthly discharge of Hanapepe ditch at weir near Hanapepe, Kauai, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean. Rim-off (total in acre-feet ■). January 1-18, 20-31 . . February March April May 1-13, 16-31 June 1-3, 7-30 July August September October 1-25, 29-31 . . November 1-21, 25-29 December 6, 8-31 The period 47.7 46.4 43.8 42.5 46.4 46.4 46.4 43.8 43.8 46.4 49.0 42.5 49.0 23.9 37.5 31.6 35.2 27.1 34.0 37.5 32.8 30.4 19.8 35.2 21.8 19.8 43.6 42.7 37.7 40.5 40.8 43.7 41.3 38.4 36.5 38.3 42.8 39.1 40.4 2,590 2,370 2,320 2,410 2,350 2,340 2,540 2,360 2,170 2,130 2,200 1,930 27, 700 Note. — Mean for month and period is for days when ditch carried water. ISLAND OF KAUAI. 43 HULEIA RIVER NEAR LIHUE, KAUAI. Location. — About 300 feet above stone bridge where ■wagon road from Lihue to the Rice plantation crosses stream; about 4 miles southeast of Lihue. Records available. — May 8, 1912, to December 31, 1913. Drainage area. — 17.9 square miles. Gage. — Vertical low-water staff gage; inclined high-water gage. Control. — Probably permanent. Discharge measurements. — Made by wading. Cooperation. — Station is maintained in cooperation with Mr. Charles Rice. Diversions. — Several above station. Accuracy. — Records poor. Daily discharge, in second-feet, of Ruleia River near Lihue, Kauai, for 1912-13. Day. May. Jiine. July. Aug. Sept. Oct. Nov. Dee. 1912. 1 7.2 7.2 7.2 9.0 11 9.4 8.3 7.4 7.2 7.2 7.4 7.4 7.2 7.4 7.4 11 7.2 7.2 7.2 7.2 7.2 7.0 6.7 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.4 6.2 6.8 5.7 5.5 5.5 5.5 6.5 5.5 7.6 9.0 7.4 7.0 40 26 7.4 9.0 7.4 7.2 7.2 7.2 7.2 7.0 7.0 7.2 7.2 7.2 7.0 7.2 7.2 7.2 7.0 6.4 6.4 6.2 6.2 7.0 6.4 5.8 5.5 5.7 5.5 5.5 5.5 7.2 9.2 6.5 6.4 5.8 6.8 5.8 5.8 6.2 5.8 7.2 7.0 7.0 52 7.2 7.0 7.2 7.4 7.2 6.4 7.2 7.2 7.2 61 8.6 7.2 7.2 7.2 6.4 5.8 5.7 5.5 5.5 5.5 5.5 5.5 6.4 5.7 5.5 5.6 5.5 5.5 5.6 6.5 5.6 5.5 5.5 5.5 5.8 5.5 5.5 5.5 5.7 5.5 5.5 6.0 7.0 7.2 7.4 7.4 5.8 5.8 5.5 5.5 5.6 5.5 6.4 7.2 31 9.0 7.2 7.2 7.0 24 8.1 7.2 9.0 9.4 8.5 7.4 7.4 7.2 7.2 7.2 7.2 7.2 7.2 40 8.1 8.1 7.7 6.4 5.8 6.8 5.7 5.7 7.0 6.2 5.7 6.4 7.2 8.1 7.4 7.2 6.5 5.7 5.7 20 8.1 9 2 . 87 3 116 4 55 5 40 6 31 7 7.4 7.2 7.2 7.2 7.2 7.2 7.2 7.2 9.0 8.1 7.4 7.2 7.2 7.0 6.9 6.5 7.2 7.4 7.2 7.2 7.2 8.1 8.5 7.6 7.4 31 8 31 9 24 10 20 11 18 12 18 13 17 14 16 15 16 16 14 17 14 18 . 14 19 12 20 14 21 14 22 12 23 65 24 87 25 73 26 64 27 27 28 16 29 14 30 14 31 14 44 WATER RESOUECES OF HAWAII, 1&13. Daily discharge, in second-feet, of Huleia River near Lihue,for 1912-13 — Continued. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. 12 7.2 11 26 11 9.7 14 7.7 14 6.0 12 11 6.4 11 21 9.7 12 46 12 11 6.0 67 9.0 5.7 11 18 9.7 191 25 9.7 9.7 6.0 25 8.1 5.5 10 16 9x7 109 15 7.7 8.1 7.7 20 7.4 7.2 10 15 9.7 80 12 7.7 7.7 9.9 18 7.4 174 9.2 15 9.9 61 11 7.7 7.7 11 18 7.2 58 8.3 15 9.9 67 10 7.7 7.7 12 21 7.2 40 7.2 18 9.7 124 9.7 7.7 7.7 173 18 7.4 37 7.2 30 9.7 67 8.7 7.7 7.7 191 18 8.1 31 6.4 25 9.7 55 8.7 7.7 7.7 44 31 9.2 17 5.7 23 9.7 28 8.7 7.7 7.7 18 44 10 12 5.5 23 44 21 7.9 7.7 7.7 14 55 14 11 7.2 28 101 18 7.7 7.7 7.7 12 35 14 9.6 8.1 21 55 15 7.7 7.4 7. 7 12 25 18 8.1 7.4 20 94 12 7.7 6.8 7.5 11 67 18 8.1 6.4 18 28 11 7.7 6.2 7.5 11 18 22 7.6 5.8 16 25 11 7.7 6.2 7.5 11 39 24 7.2 5.7 15 23 11 7.7 6.0 7.5 23 39 24 8.1 5.5 15 22 9.9 7.7 6.0 6.8 11 25 45 9.0 5.5 14 20 9.7 7.7 6.0 6.8 11 116 61 11 5.5 12 19 9.7 7.7 6.0 8.1 9.9 132 55 12 5.5 11 16 9.3 7.7 6.0 7.7 9.9 73 55 13 272 10 15 8.7 7.7 6.0 6.8 12 94 52 40 73 9.7 12 8.7 7.7 6.0 6.2 21 64 17 17 44 9.7 9.7 8.7 7. 7 6.0 6.0 74 108 16 15 25 9.7 10 8.1 7.7 6.0 6.0 70 94 12 12 23 9.7 9.7 ■ 9.7 7.7 6.0 6.0 35 73 11 12 21 9.7 9.7 11 7.7 6.0 6.0 25 61 9.0 22 9.7 9.7 11 7.7 14 6.0 16 49 7.4 23 28 9.7 12 7.7 12 6.0 15 49 8.1 25 9.7 7. 7 9.7 12 / 1913. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 2S 29 30 31 Monthly discharge of Huleia River near Lihue, Kauai, for 1912-13. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). May 7-31.. June July August September. October November. December.. 9.0 11 40 52 61 31 40 116 The period. January. . . February. . March April May June July August September. October November- December.. 1913. 61 174 272 30 101 191 46 14 14 191 132 80 6.5 6.4 5.5 6.5 5.5 5.5 5.7 9.0 The year. 7.2 5.5 5.5 9.7 9.7 8.1 7.7 6.0 6.0 6.0 12 12 5.5 7.40 7.45 8.56 7.92 7.96 8.03 8.42 31.8 18.9 21.5 22.4 17.0 21.0 34.0 10.4 7.6 7.6 29.0 50.3 30.3 22.4 367 443 526 487 474 494 501 1,960 5,250 1,160 1,190 1,380 1,010 1,290 2,020 640 467 452 1,780 2,990 1,860 16,200 ISLAND OF KAUAI. 45 HANAMAULU EIVER AT KAPAIA, NEAR LIHUE, KAUAI. Location. — At wagon-road bridge about 600 feet north of village of Kapaia and about 1.5 miles north of Lihue. Records available. — September 4, 1911, to December 31, 1913. Drainage area. — 6.41 square miles. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made from lower side of bridge during high water and by wading at low- water stages. Diversions. — Several above station. Accuracy. — Records for May and June, good; for all other months, only fair. Discharge measurements of Hanamaulu River at Kapaia, near Lihue, Kauai, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. D. E. Horner Feet. 5.30 5.54 Sec.-ft. 12.3 17.6 May 31 May 31 W. "V. Hardy Feet. 5.69 5.62 Sec. ft. 24.2 May 31 W.V.Hardy do 21.6 Daily discharge, in second-feet, of Hanamaulu River at Kapaia, Lihue, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dee. 1 25 30 23 23 19 15 11 11 8.7 8.7 7.7 12 17 12 11 9.7 9.7 11 10 9.7 9.7 15 12 12 11 12 12 9.7 12 12 9.9 9.7 9.2 8.7 11 9.7 96 47 29 24 18 9.8 8.1 7.5 14 16 14 13 13 20 13 16 16 26 35 16 19 25 22 20 14 8.5 3.0 1.5 4.2 3.4 4.6 4.7 4.8 3.8 3.8 4.6 5.0 4.6 5.6 6.5 5.8 4.2 4.4 5.0 4.6 12 19 20 22 20 12 12 13 19 21 19 20 16 9.8 8.5 8.5 9.8 11 8.5 9.8 7.5 6.2 5.0 2.5 5.0 16 6.5 5.0 3.8 2.5 2.5 6.0 7.5 8.5 6.5 10 14 7.5 7.5 6.5 7.5 8.1 7.3 6.5 5.0 1.0 5.0 5.0 6.5 18 29 41 30 41 30 41 36 30 24 25 30 24 30 28 25 22 15 7.5 11 20 19 18 82 35 30 41 35 33 31 36 25 13 14 20 18 17 16 14 25 5 1 .5 (a) (o) (a) (a) 5 12 8 5 5 5 8.5 11 14 10 5 4 6 5 4 5 10 16 7.5 13 17 9.8 6.5 7 7.5 6.5 5 4 5 7.5 7.5 7.5 7.1 9.2 8.5 13 13 9.8 6.5 5.8 5.8 5.6 5.3 5.0 3.2 1.5 3.0 3.0 1.5 1.0 1.5 2.8 4.0 1.0 3.0 1.0 1.2 1.5 1.5 1.5 1.5 1.6 3.5 16 19 10 1.8 1.5 4.0 3.0 2.5 4.0 3.0 2.0 1.8 1.8 2.0 2.0 1.8 1.9 2.0 2.5 3.0 2.0 1.5 1.0 4.2 7.5 5.8 6.5 2.0 2.5 2.5 7.8 13 4.0 3.0 3.0 3.0 3.0 2.0 1.0 .5 1.0 21 7.5 2.0 2.5 3.0 1.5 13 8.5 6.5 25 19 13 14 11 25 54 25 25 25 30 25 44 41 47 41 35 35 30 34 22 21 12 3 3.5 9.8 16 11 3 4 5 20 30 61 168 47 41 35 35 34 28 30 24 24 25 2 20 3 54 4 25 5 22 6 28 7 24 8 20 9 13 10 11 11 11 12 11 13 16 14 14 15 12 16 11 17 13 18 8.5 19 9.8 20 9.8 21 7.4 22 5.0 23 8.5 24 . 9.8 25 9.2 26 8.5 27 7.5 28 7.0 29 6.5 30 11 31 11 a No discharge June 23-26. Note. — Discharge estimated for Sundays and holidays, on which no observations were made. 46 WATER RESOURCES OF HAWAH; 1913. Monthly discharge of Hanamaulu River at Kapaia, near Lihue, Kauai, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Eun-ofE (total in acre-feet). Accu- racy. January February. . March April May Jime July August September. October November. December. . 30 96 22 21 41 82 17 19 13 64 168 54 (a) 7.7 7.5 1.5 2.5 1.0 I 4.0 1.0 1.0 .5 3.0 5.0 13.3 20.2 8.89 9.03 19.9 18.6 7.86 4.95 3.36 14.8 30.3 14.5 818 1,120 647 637 1,220 1,110 483 304 200 910 1,800 892 The year. 168 (a) 13.7 9,940 o Channel dry. SOUTH FORK OF WAILUA RIVER ABOVE WAIEHU FALLS, NEAR LIHUE, KAUAI. Location. — One mile above Waiehu Falls and about 7 miles northeast of Lihue. Records available. — December 10, 1911, to December 31, 1913. Drainage area. — 22.4 square miles. Gage. — Friez water-stage recorder. Control. — Probably permanent. Discharge measurements. — ^Made from cable or by wading. Diversions. — Several above station. Accuracy. — Records good except for November and December, when they were only fair. Discharge measurements of South Fork of Wailua River above Waiehu Falls, near Lihue, Kauai, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Feb. 23 D. E. Homer. Feet. 3.61 3.56 Sec.-ft. 79.0 76.6 May 30 W. V. Hardy . . Feet. 4.12 Sec.-ft. 192 23 do ISLAND OF KAUAI. 47 Daily discharge, in second-feet, of South Fork of Wailua River above Waiehu Falls, near Lihue, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 87 66 56 54 54 66 56 239 116 228 184 292 760 242 593 458 181 142 120 98 144 449 187 359 154 105 105 64 100 56 76 58 50 42 40 40 608 363 184 109 109 120 87 74 68 94 116 66 98 133 94 80 72 76 162 74 62 60 74 54 53 51 45 42 40 124 98 74 64 60 56 96 96 53 45 89 64 68 87 98 102 210 142 184 135 60 66 120 98 87 127 118 113 111 83 72 60 58 157 72 72 48 343 256 253 • 118 239 219 150 98 94 78 138 80 288 120 83 83 118 225 116 204 162 131 96 173 173 384 150 116 295 677 663 225 462 288 246 256 152 127 116 107 87 100 78 72 74 74 76 201 76 58 68 1,150 295 204 189 135 109 127 116 154 105 154 138 120 160 98 107 184 111 105 56 56 48 63 94 201 195 109 113 192 453 162 173 192 98 76 72 76 60 56 60 154 83 76 72 66 56 68 107 70 54 48 54 138 242 120 76 131 78 74 129 80 45 40 37 37 48 45 43 42 40 53 87 80 66 46 40 36 38 40 150 64 48 45 74 60 43 98 278 120 274 204 270 225 98 91 201 138 80 66 58 53 46 40 42 56 46 40 37 40 34 26 38 13 19 24 24 14 14 14 17 15 19 23 25 23 109 94 838 774 232 195 164 242 167 207 152 157 181 131 107 189 253 127 219 162 131 109 213 124 131 131 109 116 105 105 106 107 108 109 335 418 792 1,060 925 375 267 253 219 204 962 2 3 4 5 6 7 8 9 10 128 11 135 12 130 13 130 14 119 15 116 16 112 17 110 18 112 19 101 20 88 21 92 22: 92 23 92 24 88 25 85 26 .... 88 27 79 28 - - 85 29 66 30 68 31 66 Note.— Evidences point to a maximum discharge of about 4,500 second-feet on the night of Nov. 20. No record Nov. 20 to Dee. 9. Discharge interpolated Nov. 5-7. Monthly discharge of South Fork of Wailua River above Waiehu Falls, near Lihue, Kauai, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean, Eun-ofI (total in acre-feet). Accu- racy. January February March April May June July August September October November 1-19 . . . December 10-31... The period. 760 608 210 343 677 1,150 453 278 270 838 1,060 135 36 13 15 105 66 190 115 85.8 136 199 160 111 75 68.9 182 351 99.2 11,700 6,390 5,280 8,090 12,200 9,520 6,820 4,610 4,100 11,200 13,200 4,320 97, 400 48 WATER EESOUECES OF HAWAII^ 1913. HANAMAULU DITCH NEAR LIHUE, KAUAI. Location. — ^About 6 miles northwest of Lihue, in flume 180 feet above point where the Kauai Electric Co.'s power line crosses the South Fork of Wailua River. Records available. — ^July 1, 1910, to December 31, 1913. Gage. — ^Vertical staff installed September 30, 1911, on left side of flume, 13 feet from upper end; new datum. Control. — Probably permanent. Discharge measurements. — ^Made in flume. Diversion. — Ditch diverts part of flow of the South Fork of Wailua River. Accuracy. — Records very good. The following discharge measurement was made by D. E. Horner: January 31, 1913: Gage height, 2.14 feet; discharge, 38 second-feet. Daily discharge, in second-feet, of Hanamaulu ditch near Lihue, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July.' Aug. Sept. Oct. Nov. Dec. 1 38 38 38 27 27 27 32 32 35 35 36 41 41 40 40 39 38 38 38 38 38 47 47 40 40 38 38 38 37 36 36 35 38 44 42 42 47 41 32 32 14 14 32 30 30 30 30 30 30 28 28 28 28 28 32 29 28 28 28 28 28 27 27 41 41 42 42 41 41 41 38 36 36 36 38 38 40 40 40 40 40 42 24 40 40 32 32 32 32 32 32 32 32 32 30 29 29 29 32 32 40 40 41 40 40 40 40 40 40 38 38 36 38 38 47 34 34 32 32 32 32 32 41 41 40 40 41 40 40 40 32 32 32 32 22 22 22 15 15 14 29 29 29 29 29 29 38 38 39 41 41 41 41 33 9.2 9.2 9.2 9.2 40 39 39 38 39 39 39 39 39 39 39 39 35 35 38 38 38 41 40 40 40 40 40 40 39 39 40 40 40 40 40 39 39 38 38 36 36 36 36 36 36 36 40 40 35 35 44 44 45 41 41 36 36 36 38 36 36 38 38 56 38 38 38 35 35 35 40 40 40 40 39 39 39 39 40 39 38 38 38 38 38 38 40 37 37 37 38 38 37 37 39 40 40 38 38 38 40 40 36 35 35 35 35 36 36 36 40 40 40 40 39 38 38 39 38 41 38 34 32 32 41 47 47 33 32 41 41 35 34 34 36 36 36 24 35 36 36 36 32 32 32 32 33 32 32 32 24 23 24 15 15 15 15 15 15 15 15 11 11 12 15 15 32 32 32 33 13 13 5' 5 2 3 4 5 6 7 8 9 10 12 11 12 12 12 13 32 14 32 15 32 16 32 17 32 18 24 19 23 20 23 21 23 22 23 23 23 24 23 25 23 26 23 27 ... 23 28 32 29 32 30 32 31 32 Note.— Ditch dry, Nov. 23-28 and Dec. 1-9. ISLAND OF KAUAI. 49 Monthly discharge of Hanamaulu ditch near Lihue, Kauai, for 1913. Month. January February March April May June July August September October November December The year Discharge in second-feet. Maximum. Minimum. Mean 27 14 24 29 14 9.2 35 35 35 24 37:2 31.4 36.3 35.6 32.1 34.8 38.6 38.6 37.9 35.3 14.0 17.9 32.5 Run-off (total in acre-feet). 2,290 1,740 2,230 2,120 1,970 2,070 2,370 2,370 2,260 2,170 832 1,100 23,500 Accu- racy. LIHUE DITCH NEAR LIHUE, KAUAI. Location. — About 5 miles northwest of Lihue, at point where Kauai Electric Co. 'a power line crosses the ditch. Records available.— July 1, 1910, to December 31, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made by wading. Diversion.— Ditch diverts part of flow of the South Fork of Wailua River. Accuracy. — Records fair. The following discharge measurement was made by W. V. Hardy and D. E. Homer: May 29, 1913: Gage height, 1.42 feet; discharge, 8.93 second-feet. Daily discharge, in second-feet, of Lihue ditch near Lihue, Kauai, for 1913. Dav. Jan. Feb. Mar. Apr. June. July. Aug. Sept. Oct. Nov. Dec 1 2 3 4 5 6 7 8, 9 10 11 12. 13. 1-1 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29 30 31, 8.4 8.4 8.4 8.4 8.4 9.6 9.6 10.0 10.4 10.6 8.8 8.8 8.4 8.4 8.4 10.4 7.6 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.1 6.8 9.6 4.4 4.4 4.0 3.9 3.8 3.8 3.8 3.6 3.6 4.0 4.0 3.9 4.4 4.0 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.2 7.6 7.6 8.0 8.0 8.0 8.4 8.5 8.8 8.0 8.4 8.0 6.8 6.8 6.8 8.8 8.8 8.0 8.0 8.0 7.6 7.6 7.2 7.6 7.6 8.0 8.0 8.8 8.8 8.8 8.8 8.0 8.0 8.0 8.0 8.0 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 10.4 9.6 9.6 10.4 8.0 9.6 9.6 3.7 3.7 3.7 3.7 3.7 .3.7 8.0 8.0 8.0 8.0 9.6 9.6 9.6 8.8 8.9 9.6 9.2 9.6 3.7 7.4 7.2 7.2 9.0 9.0 9.0 9.0 9.8 9.8 9.8 9.0 9.0 9.0 9.0 9.0 9.7 9.7 9.8 9.8 9.6 9.6 9.6 9.2 9.5 9.4 9.4 9.4 9.0 9.0 9.2 9.4 9.4 9.4 9.4 9.4 9.4 9.4 9.8 9.8 10.4 10.4 10.4 10.0 9.8 9.8 10.0 9.3 9.1 9.0 9.0 9.8 8.9 8.8 8.8 10.0 9.6 9.4 10.0 9.6 9.0 9.6 9.8 10.4 10.4 10.2 9.6 9.5 9.6 9.6 9.8 10.4 10.8 10.6 10.2 10. S 10.7 10.0 11.2 11.1 10.4 10.4 10.2 10.2 9.6 9.6 10.4 10.1 10.1 9.6 9.6 9.6 9.6 9.5 10.1 10.1 10.1 9.8 9.6 9.6 9.4 10.2 10.0 10.0 10.2 10.0 9.6 9.4 9.4 9.9 10.9 12.0 10.4 9.9 11.4 11.4 11.2 10.6 10.6 10.4 10.6 10.6 3.7 10.4 10.4 10.9 10.0 9.8 9.9 10.2 10.4 10.0 10.0 9.6 9.6 8.8 8.8 9.0 6.6 6.6 6.6 6.5 6.5 6.7 7.4 7.5 7.4 7.4 7.4 8.0 8.0 8.0 8.0 8.0 6.4 6.4 6.4 6.3 6.2 6.2 6.4 6.4 7.0 2.5 2.5 2.5 2.5 6.9 6.9 6.9 7.0 7.1 7.1 7.2 7.2 7.2 7.2 7.2 Note.— Ditch dry Feb. 7-11, June 4, Dec. 1-16. 97764°— wsp 373—15 4 50 WATER EESOXJECES OF HAWAII, 1913. Monthly discharge of Lihue ditch near Lihue, Kauai, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-ofl (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 10.6 9.6 8.8 10.4 10.4 9.8 10.4 10.8 11.2 12.0 9.0 7.2 12.0 7.2 3.8 7.2 3.7 8.8 8.8 9.4 3.7 6.2 8.66 3.98 7.04 8.59 8.41 8.63 9.52 9.61 10.1 10.1 7.26 2.84 7.92 632 221 433 Sll 517 513 585 591 601 621 432 175 5,730 NORTH FORK OF WAILUA RIVER NEAR LIHUE, KAUAI. Location. — About 12 miles north of Lihue and 300 feet below confluence of main and east branches of the stream. Records available. — August 1 to October 28, 1910; December 28, 1910, to December 31, 1913. Drainage area. — 14.6 square miles. Gage. — Friez automatic water-stage recorder. Datum changed. Control. — Fairly permanent. Discharge measurements. — ^Made from wire suspension footbridge. Diversions. — Kanaha ditch diverts part of flow above the station. Accuracy. — Records fair from January to May; all other records good. The following discharge measurement was made by W. V. Hardy: May 29, 1913: Gage height, 0.52 foot; discharge, 39.7 feet. Daily discharge, in second-feet, of North Fori of Wailua River near Lihue, Kauai, for 1913. Jan. Feb. Apr. May. July. Aug. Sept. Oct. Nov. Dec. 1 2 3 4 5 6 7 8 9 10 11 12 13 14, 15. 16 17, 18, 19, 20, 21, 22, 23. 24. 25. 26. 27. 28. 29. 30. 31, 57 54 43 36 38 37 48 130 57 108 111 182 353 128 366 192 102 78 73 122 196 85 142 27 24 23 23 22 217 132 67 50 84 81 75 66 111 44 16 15 19 18 22 25 29 32 36 39 43 53 58 229 222 172 92 72 65 53 50 81 62 64 51 35 26 23 23 51 35 43 27 130 156 147 71 1.53 106 81 59 54 51 61 40 132 49 38 34 37 82 39 104 54 40 30 85 106 52 41 140 232 177 111 109 73 66 58 49 46 64 49 42 45 47 47 87 45 40 58 551 146 106 109 85 70 92 84 92 63 88 70 64 70 49 54 65 60 55 38 38 34 42 66 97 114 95 267 111 119 104 56 47 43 42 47 90 63 58 54 44 36 51 77 43 37 36 38 83 108 71 40 85 43 38 42 36 34 32 32 32 35 38 42 36 32 50 47 64 41 63 42 37 49 34 58 42 34 34 45 39 35 88 171 95 182 150 ,77 60 111 83 60 54 44 41 42 38 36 33 30 27 26 25 62 57 368 178 97 120 106 144 m 84 74 77 57 49 146 132 78 155 83 65 66 112 54 116 77 67 52 67 84 62 184 213 394 590 394 173 127 106 98 100 262 353 659 424 343 289 504 420 257 218 570 303 202 168 220 213 224 200 146 124 111 103 92 90 85 78 76 73 71 71 69 69) 62: 64 47' 44 42 42; 41 40' 36. 32: 35. Discharge estimated Mar. 16-20. ISLAND OF KAUAI. 51 Monthly discharge of North ForTc of Wailua River near Lihue, Kauai, for 191S. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 366 217 229 156 232 551 267 171 182 368 659 224 103 52.1 64.6 66.7 77.3 88.9 70.1 50.6 53.1 91.9 251 95.2 6,330 2,890 3,970 3,970 4,750 5,290 4,310 3,110 3,160 5,650 14,900 5,850 64,200 KANAKA DITCH NEAR LIHUE, KAUAI. Location. — About 9 miles north of Lihue and about 500 feet above the point where the Kauai Electric Co.'s power line crosses the ditch. Records available. — August 6, 1910, to December 31, 1913. Gage. — Vertical staff; datum changed. Discharge measurements. — Made in flume 100 feet above gage. Diversion. — Diverts part of flow of North Fork of Wailua River. Accuracy. — Records good. Discharge measurements of Kanaha ditch near Lihue, Kauai, in 1913. Date. Hydrographer. height. Dis- charge. May 28 a May 30 a D. E. Horner. W.V.Hardy. Feet. 2.02 2.43 See. ft. 27.9 33.2 a Measurements refer to gage installed May 2S. 52 WATER KESOUECES OP HAWAII^ 1913. Daily discharge, in second-feet, of Kanaka ditch near Lihue, Kauai, for 1912-13. Day. Jan. Feb. Mar. Apr. May. Jime. Ju]y. Aug. Sept. Oct. Nov. Dec. 1912. 1 24 24 21 20 20 20 20 19 19 19 25 24 24 24 24 22 22 22 24 24 24 24 22 25 25 25 28 28 28 25 25 24 24 23 23 22 25 30 28 16 16 16 16 16 15 15 15 15 13 12 12 12 12 12 15 12 12 12 12 25 25 28 27 25 25 28 27 28 28 31 31 31 30 28 27 27 26 25 25 28 28 28 22 24 24 24 22 22 25 25 12 12 12 11 11 24 33 31 28 28 28 28 28 28 28 28 28 28 30 31 31 33 33 31 32 31 30 30 29 29 29 25 24 24 25 28 27 30 30 30 28 27 27 25 25 25 27 31 22 21 21 16 16 16 25 28 24 27 27 28 28 31 31 31 31 30 29 28 28 31 31 30 30 31 31 31 31 31 31 31 30 30 28 30 31 33 33 31 31 31 33 28 27 28 33 30 28 27 30 28 27 26 25 25 28 28 28 28 28 28 28 28 28 28 29 29 29 29 31 31 30 28 31 33 33 33 32 33 32 32 31 30 33 33 33 30 30 30 27 25 24 24 21 21 21 21 21 27 25 26 29 29 29 28 27 27 27 27 28 28 28 28 28 28 28 28 28 28 28 28 27 27 27 28 30 30 28 27 27 30 28 27 27 26 30 30 26 26 28 24 25 29 25 25 25 31 31 31 31 28 29 31 31 31 31 31 29 31 31 31 32 32 32 28 28 28 28 28 28 31 33 28 33 33 33 33 35 31 28 33 39 31 31 31 28 28 28 30 31 31 31 39 33 28 32 34 32 31 31 31 31 31 30 30 28 32 32 32 32 30 30 30 30 31 31 28 29 36 36 36 34 32 31 31 31 27 30 30 30 30 39 31 33 33 33 33 33 33 35 31 33 39 31 31 31 31 39 39 39 35 33 33 33 33 35 35 29 31 31 28 28 28 28 28 31 28 26 26 32 32 32 34 26 26 29 30 34 34 32 31 31 29 29 29 35 34 34 35 35 33 33 33 35 33 33 33 33 33 30 30 30 31 32 30 28 28 31 31 32 31 30 28 28 28 27 31 32 34 31 31 31 31 ■ 34 32 31 ■ 30 30 30 28 31 30 29 29 29 28 28 28 28 29 28 28 28 28 26 27 29 30 31 30 31 31 34 32 32 33 32 32 33 33 32 31 31 30 34 33 34 34 34 34 34 33 33 35 34 34 33 31 32 28 28 26 26 26 30 32 35 32 30 30 32 34 34 32 32 32 31 31 31 32 32 32 32 32 32 32 32 32 31 31 30 31 31 31 35 35 33 33 35 34 32 30 30 30 33 29 29 32 33 34 34 35 11 11 12 33 30 31 31 31 26 25 25 25 25 25 26 26 29 26 30 30 30 30 30 30 30 29 19 19 19 18 18 18 18 18 18 32 2 35 3 33 4 11 5 11 6 11 7 10 8 11 9 11 10 22 11 22 12 22 13 22 14 21 15 21 16 21 17 27 18 27 19 30 20 31 21 29 22 21 22 22 22 21 21 21 19 19 19 22 22 21 22 22 22 22 ■ 28 28 29 30 31 33 30 31 33 28 24 22 22 22 35 31 31 28 28 27 27 24 23 22 30 23 29 24 30 25 28 26 27 27 27 28 24 29 22 30 22 31 22 1913. 1 2 3 4 6 6 7 8 9 10 11 12 13 11 14 11 15 11 16 11 17 11 18 11 19 14 20... 14 21 14 22 14 23 16 24 16 25 16 26 16 27 16 28 20 29 23 30 24 31 24 Note.— Channel dry Jan. 3-21, Nov. 23-25, 1912; Dec. 1-12, 1913. ISLAisTD OP KAtJAl. 53 Monthly discharge of Kanaha ditch near Lihue, Kauai, for 1912-13. Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-off (total in acre-feet). Accu- racy. 1912 January February March April May June July August September October November December The year 1913 January February March April May June July August September October 1 November December 13-31 The year 8.23 23.2 26.4 25.2 28.3 27.8 30.9 33.3 31.2 32.6 26.9 23.2 26.6 26.4 17.0 26.6 30.6 27.4 29.1 SI. 5 30.2 29.5 31.0 25.2 9.45 506 1,330 1,620 1,500 1,740 1,650 1,900 2,050 1,860 2,000 1,600 1,430 19, 200 1,620 944 1,640 1,820 1,680 1,730 1,940 1,860 1,760 1,910 1,500 581 36 26.2 19,000 EAST BRANCH OF NORTH FORK OF WAILUA RIVER, NEAR LIHUE, KAUAI. Location. — About 8 miles nortli of Lihue, 600 feet above gaging station on the North Fork of Wailua, and 400 feet above the confluence of the North and East branches of the North Fork of Wailua River. Records available.— July 27, 1912, to December 31, 1913. Drainage area. — 6.2 square miles. Gage. — Inclined staff. Control. — Probably permanent. Discharge measurements. — ^Made by wading. Accuracy. — Records fair except for November, when broken records were obtained. Discharge measurements of East Branch of North Fork of Wailua River near Lihue, Kauai, in 1913. Date. Jan. 19 May 29 Hydrographcr. D. E. Horner. W. V. Hardy. Gage height Feet. 6. .50 6.30 Dis- charge. Sec.-ft. 46.7 30.7 54 WATER EESOUECES OF HAWAII^ 1913. Daily discharge, in second-feet, of East Branch of North Forh of Wailua River, near Lihue, Kauai, for 1912-13. Day. July. Aug. Sept. Oct. Nov. Dec. Day. July. Aug. Sept. Oct. Nov. Dec. 1912. 1 26 25 24 23 22 32 36 32 32 26 24 24 24 28 32 32 41 36 32 32 52 36 30 32 26 24 24 24 23 21 41 82 82 26 24 22 23 36 28 26 100 36 30 28 26 34 28 26 37 48 41 36 38 S9 96 34 26 26 24 26 66 49 31 14 14 100 69 68 56 55 53 51 43 41 30 1912. 16 36 32 25 28 26 24 24 24 23 26 32 52 32 32 41 36 20 20 20 20 24 23 23 20 19 18 17 17 18 19 20 24 32 28 43 32 66 41 36 34 33 39 34 37 39 40 39 26 23 26 39 32 48 63 76 30 28 26 24 36 47 59 32 2 17..;;.;:;:.. 32 3 ... 18 . .. 32 4 19 30 5 20 55 6 21 14 7 22 179 8 23 69 9 24 65 10 25 62 11 26 58 12 27 28 28 28 36 27 52 13 28 50 14 29 24 15 30 36 31 36 Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec, 1913. 1 34 32 32 30 39 30 28 32 32 39 46 74 71 66 79 59 55 52 41 41 41 24 56 100 52 40 41 32 32 31 30 30 29 28 26 26 24 32 41 33 41 36 36 27 26 26 35 28 28 28 28 32 31 30 32 28 26 24 23 23 24 23 18 18 20 28 32 21 31 24 24 23 24 24 18 20 23 26 28 29 30 32 24 17 12 28 44 41 34 41 41 41 41 36 32 25 30 36 36 41 26 24 26 63 100 83 66 52 52 44 41 44 46 43 41 32 32 32 41 52 41 36 36 32 41 66 69 41 32 32 34 52 46 41 41 46 52 58 41 35 34 32 32 32 32 30 30 28 24 17 24 35 24 42 69 52 45 43 40 46 48 42 41 46 41 36 52 35 34 34 32 28 26 28 28 26 26 32 58 30 43 41 47 S3 59 56 36 34 32 30 28 32 32 35 31 30 26 24 30 30 26 36 26 24 29 24 52 32 32 32 30 26 29 26 22 24 24 25 24 24 32 24 26 24 35 36 38 41 27 32 26 24 35 24 27 30 24 24 24 24 56 46 41 42 42 43 44 36 40 44 32 28 24 26 24 24 24 24 23 23 20 20 20 32 26 20 19 19 18 18 31 26 22 18 18 17 17 16 36 56 50 43 36 34 46 45 44 42 41 36 35 33 32 32 41 40 36 34 33 32 37 36 32 30 70 110 30 32 30 32 44 36 27 32 43 43 44 44 44 45 61 76 92 108 123 139 154 170 151 132 114 95 82 143 133 2 . .. 123 3 113 4 102 5 92 6 82 7 82 8 62 9 . . .. 55 10 52 11 SO 12 48 13 41 14 112 15. 34 16 32 17 30 18 28 19 27 20 26 21 24 22 . . 26 23 24 24 24 25 26 24 27 241 28 29 23* 30. . .- 20 31 20 Note. — Discharge estimated for following days on which no gage heights were recorded: 1912: Aug. 14; Sept. 13; Nov. 4, 21, 25, 28, and 29; Dec. 2, 3, 11, 24, and 25; 1913: Jan. 1, 10, and 30; Feb. 3, 7, and 19; Mar. 17-19, 24, and 27; Apr. 4, 7, 14, 16. and 22; June 3 and 18; July 2, 3, and 28; Aug. 15 and 23; Sept. 1-3, 6, 15, 22, 29, and 30; Oct. 6, 15, 20, and 26; Nov. 1, 12-14, 17-23, and 25-27; Dec. 1-5, 16, 19, and 25. ISLAND OF KAUAI. 55 Monthly discharge of East Branch of North Fork of Wailua River near Lihue, Kauai, for 1912-13. Month. Discharge in second-feet. Run-off (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. 1912. July 27-31 36 52 52 100 96 179 27 22 17 22 23 14 29.4 29.2 25.4 39.0 38.7 50.5 291 1,800 1,510 2,400 2,300 3,110 B. B. B. B. B. B. 1913. January 100 41 44 100 66 69 59 56 44 56 170 133 28 23 12 24 17 24 24 22 18 16 27 20 44.9 29.8 25.9 43.3 38.0 38.7 34.0 29.6 27.8 34.8 78.2 50.9 2,760 1,660 1,590 2,580 2,340 2,300 2,090 1,820 1,650 2,140 4,650 3,130 B. B. March B. B. May B. June B. July B. August B B. B. C. B. 170 12 39.7 28,700 KONOHIKI STREAM AT MAKAKUALELE WEIR (mAUKA), NEAR KEALIA, KAUAI. Location. — About 5 miles southwest of Kealia. Records available. — April 1, 1911, to December 31, 1913. Gage. — Vertical staff. Discharge measurements. — Made with 3-foot sharp-crested weir. Cooperation. — Station maintained and daily-discharge record furnished by the Makee Sugar Co. Discharge, in million gallons per day, of Konohiki Streavi at Makakualele weir (mauka), near Kealia, Kauai, for 1913. Day. Ja n. Feb. M ar. Apr. May. June. J a ly- Aug. Se pt. Oct. Nov. Dee. 1 . . .. 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 38 34 0.38 .38 .38 .38 .38 1.17 .96 .49 .45 .41 .45 .41 .41 .41 .41 .41 .41 .67 .58 .45 .45 .45 .45 .49 1 .45 .45 .45 .45 45 45 45 41 41 41 41 41 41 41 41 41 41 45 41 41 41 41 41 41 41 41 58 34 91 81 71 62 62 62 54 0.54 .54 .54 .49 .49 .49 .49 .49 .49 .49 .49 .49 .49 .49 .54 .49 .49 .49 .49 .49 .49 .49 .49 .49 .49 .49 .49 .49 .49 .49 0.49 .49 .49 .49 .49 .49 .54 .54 .54 .49 .49 1.06 1.17 .91 .67 .58 .62 .58 .58 .49 .49 .49 .58 .58 ..58 .58 .54 .54 .54 .54 .54 0.54 .54 3.79 2.79 2.21 1.64 1.28 1.17 1.40 1.17 1.06 1.01 1.01 .96 .96 .96 .96 .96 .96 .96 .86 .86 .86 .86 ... .86 ... .86 ... .96 ... .96 .86 .86 86 86 86 86 86 81 81 81 81 81 81 81 96 86 86 81 81 81 81 81 81 81 76 ii 71 67 67 0.67 .67 .67 1 .67 .67 .67 .62 .62 .62 .62 .62 .62 .71 .71 .71 .71 .67 .67 .67 .67 .67 .58 .58 .62 .67 .58 .67 .67 .67 .67 .67 ... 67 67 16 96 67 67 67 67 67 62 62 02 58 58 58 58 58 58 58 58 58 58 58 58 58 58 58 76 58 58 0.58 .58 .54 .58 .58 .49 .49 .49 .62 .62 .54 .54 .54 .54 .54 .54 .86 .71 .71 .67 .58 .58 .62 .76 .67 .67 .62 .62 .76 .67 .67 0.62 .62 .62 .62 .62 .71 .71 .71 .71 .62 .58 .58 .58 .58 .54 .54 .54 .54 .62 .76 18.3 6.47 2.57 2.57 2.36 1.95 1.95 1.95 .62 .62 1.95 2 3 2.79 3.01 4 3.01 5 2.29 6 2.09 7 2.09 8 2.71 9 2.71 10 11 2.21 2.09 12. 2.02 13 14 15 16 1.89 1.83 1.83 1.76 17. 1.64 18 19 1.52 1.52 20 1.64 21 1.52 22 1.52 23 1.46 24 1.46 25 1.46 26 1.40 27 1.40 28 1.34 29 1.34 30 1 34 31 1.34 Note.— No record July 24-27. 56 WATEE EESOUKCES OP HAWAII, 1913. Monthly discharge of KonohiM Stream at Makakualele weir {mauha), near Kealia, Kauai, ' for 1913. Month. Discharge m million gallons per day. Maximum. Minimum. Mean. Run-off (total in acre-feet). January February March April May June July 1-23, 28-31 August September October NoTcmber December The period (361 days) 0.38 1.17 1.34 .54 1.17 3.79 .86 .71 1.16 .86 18.3 3.01 0.34 .38 .41 .49 .49 .54 .67 .58 .58 .49 .54 1.34 .34 0.38 .47 .51 .50 .59 1.17 .81 .66 .64 .61 1.72 1.88 .83 36 40 49 46 56 108 67 63 59 58 158 179 Note. — Mean for July is for 27 days. SOUTH FORK OF KAEHULUA STREAM AT WAINAMUAMU WEIR, NEAR KEALIA, KAUAI. Location. — About 5 miles southwest of Kealia. Records available. — April 1, 1911, to December 31, 1913. Gage. — Vertical staff. Discharge measurements. — ^Made with a 3-foot sharp-crested weir. Cooperation. — Station maintained and daily-discharge record furnished by the Makee Sugar Co. Discharge, m million gallons per day, of South Fork of Kaehulua Stream at Waina- muamu weir, near Kealia, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 0.30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .27 .27 .27 .27 .27 .27 .27 .27 .27 .27 .27 .27 .27 .27 .27 .27 .27 .27 .27 .27 .27 0.27 .27 .27 .27 .27 .58 .49 .41 .38 .38 .34 .34 .34 .34 .34 .34 .30 .38 .34 .30 .30 .30 .30 .34 .30 .30 .30 .30 0.30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .41 .58 .54 .41 .38 .34 .34 .34 .30 0.30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 0.30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .45 .49 .81 .34 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .27 .27 .27 .27 .27 0.27 .27 1.34 1.06 .86 .76 .49 .49 .45 .45 .41 .41 .41 .38 .38 .38 .38 .38 .38 .38 .38 .38 .38 .38 .38 .38 .38 .38 .38 .38 0.38 .38 .38 .38 .38 .34 ""Mi" .34 ""'."so" 1.17 .34 .34 .34 1.70 .34 .34 .30 1.64 .91 .38 .38 .38 .38 2.29 .38 .38 .38 .38 .38 .38 .58 .58 .58 .58 .49 .45 .45 .45 .62 .62 .62 .62 .68 .58 .58 .58 .58 .58 0.58 .67 .67 .67 .58 .58 .58 .58 .58 .58 .58 .58 .54 .54 .54 .54 .54 .54 .54 .54 .54 .54 .49 .49 .49 .49 .58 .62 .49 .49 0.49 .49 .45 .41 .41 .41 .45 .45 .58 .58 .58 .58 .58 .58 .58 .58 .96 .76 .76 .71 .62 .58 .67 .81 .71 .71 .67 .58 .71 .76 .76 0.62 .67 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 0.58 2 .58 3 .58 4 .58 5 .58 6 .58 7 .58 8 .58 9 .58 10 .58 11 .58 12 .58 13 .58 14 .58 15. .58 16 .58 17 .58 18 .58 19 ,.58 20 .58 21 .58 22 .58 23 .58 24 .58 25. .58 26 .58 27. .58 28 .58 29 .58 30 .58 31 .58 Note.— No record July 7-12, 15-22. ISLAND OF KAUAI. 51 Monthly discharge of South Fork of Kaehulua Stream at Wainamuamu weir, near Kealia, Kauai, for 1913. Month. Discharge ui million gallons per Maximum. Minimum. Mean Run-off (total in acre-feet). January Februaiy March April May June July 1-6, 13-14, 23-31 August September October November December The period (351 days) 0.30 .58 .58 .30 .81 1.34 1.70 2.29 .67 .96 .67 .58 2.29 0.27 .27 .30 .30 .27 .27 .30 .38 .49 .41 .57 .58 .27 0.28 .34 .33 .30 .32 .46 .48 .61 .56 .61 .58 .58 .45 490 KAEHULUA STREAM AT KUHINOA WEIR, NEAR KEALIA, KAUAI. Location. — ^About 3 miles southwest of Kealia. Records available. — May 1, 1911, to December 31, 1913. Gage. — ^Vertical staff. Discharge measurements. — ^Made with. 6.5-foot sharp-crested weir. Cooperation. — Station maintained and daily-discharge record furnished by Makee Sugar Co. Discharge, in million gallons per day, of Kaehulua Stream at Kuhinoa weir, near Kealia, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 0.04 .04 .04 .04 .07 .07 .11 .12 .07 .12 .12 .12 .12 .12 .12 .26 .44 .44 .12 .12 .12 .12 .58 . .12 .12 .12 .12 .12 .12 .12 .12 0.12 .12 .12 .12 .12 .44 .44 .44 .44 .44 .44 .44 .44 .44 .44 .12 .12 .12 .12 .12 .12 .12 .24 .24 .24 .24 .24 .24 0.44 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .44 .44 .44 .44 .44 .44 .44 .12 .12 0.12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .04 .04 .04 .04 .11 .11 .04 .04 .07 .07 .07 .12 .12 .32 .26 .26 .21 .21 .21 .32 0.44 .38 .26 .21 .12 .12 .26 .12 .21 .21 .21 .81 2.54 2.08 1.86 1.86 1.86 .81 .81 1.16 .44 .21 .12 .12 .12 .12 .12 .12 .12 .12 .12 0.12 .12 9.14 9.14 11.1 3.96 3.82 1.26 1.16 .90 .58 .44 .38 .32 .38 .51 .32 .32 .32 .32 .32 .26 .21 .32 .26 .21 .12 .12 .12 .21 0.21 .26 .81 .66 .58 .73 .44 .38 .26 .26 .26 .26 .26 .26 .21 .21 .12 .12 .12 .12 .12 .21 .12 .12 .12 .12 .12 .12 .12 .12 .12 0.12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .11 .11 .07 .07 .07 .07 .04 .04 .04 .04 .04 .04 .04 .04 .04 .04 .04 .04 .04 .04 0.11 .11 .12 .12 .12 .12 .12 .12 .12 .12 .11 .11 .07 .07 .07 .07 .07 .07 .07 .07 .07 .07 .07 .07 .04 .04 .04 .12 .12 .12 0.07 .07 .07 .07 .07 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .12 .32 .26 .26 .21 .21 .21 .44 .44 .44 .44 .44 .44 .58 .58 .58 0.44 .44 .32 .26 .26 .26 .44 .51 .51 .44 .32 .26 .44 .44 .58 .58 .58 .58 .73 1.07 39.7 14.0 6.52 6.52 4.96 1.26 .81 .81 .81 .81 6.52 2 4.96 3 6.52 4 5.72 5 3.55 6 7 3.55 8 4.96 9 4.23 10 4.38 11 3.82 12 2.91 13 3.55 14 3.55 15 3 55 16 ... 2.91 17 2.91 18 . . 3 55 19 6.52 20 3.55 21 3.55 22 3.55 23 3.55 24 2.91 25 2 91 26 2.91 27 .44 28 .44 29 .44 30 44 31 .44 58 Water eesoueces op Hawaii^ 1^13. Monthly discharge of Kaehulua Stream at Kuhinoa weir, near Kealia, Kauai, for 1913. Month.. Discharge in million gallons per Maximum. Minimum. Mean, Run-off (total in acre-feet). January February March April May June July August September October November December The vear 0.58 .44 .44 .32 2.54 11.1 .81 .12 .12 .58 39.7 6.52 0.04 .12 .12 .04 .12 .12 .12 .04 .04 .07 .26 .44 0.14 .26 .20 .13 .58 1.56 .26 .08 .09 .24 2.86 3.43 39.7 .04 .82 13 22 19 12 55 144 25 23 263 326 918 NORTH FORK OF KEAHULUA STREAM AT KAINAHOLA WEIR, NEAR KEALIA, KAUAI. Location. — About 3 miles southwest of Kealia. Records available. — April 1, 1911, to December 31, 1913. Gage. — Vertical staff. Discharge measurements. — ^Made with 3-foot sharp-crested weir. Cooperation. — Station maintained and daily-discharge record furnished by the Makee Sugar Co. Daily discharge, in million gallons per day, of North Fork of Kaehulua Stream at Kaina- hola weir, near Kealia, Kauai, for 1913. Day. Jan. Feb. Mai-. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 0.41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 0.41 .41 .41 .41 .41 .49 .54 .45 .41 .41 .41 .41 .41 .41 .41 .41 .41 .58 .45 .41 .41 .41 .41 .41 .41 .41 .41 .41 0.41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .38 .38 .38 .38 .38 .38 .38 .38 .38 .38 .38 .38 .58 .49 .41 .41 .41 .41 .41 .41 .41 0.41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .49 .49 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 0.41 .41 .41 .41 .41 .41 .41 .41 .49 .41 .41 .45 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 0.41 .41 .96 .58 .58 .49 .49 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 0.41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 0.41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 0.41 .41 .49 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .58 .41 .41 0.41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 0.41 .41 .41 .41 .41 .41 .41 .41 .49 .41 .41 .41 .41 .41 .41 .41 .41 .41 .41 .58 .67 .62 .58 .58 .58 .49 .41 .41 .41 .41 0.81 2 .58 3 .62 4 1.01 5 .81 6 .58 7 .49 8 .49 9 .41 10 .41 11 .41 12 .41 13 . .. . .41 14 .41 15 .41 16 .41 17 .41 18 .41 19 .... .41 20 .41 21 .41 22 .41 23 .41 24 . .41 25 .41 26 .41 27 .41 28 .41 29 .41 30 .41 31 .41 ISLAKi) OF KAtTAi. 50 Monthly discharge of North Fork of Kaehulua Stream at Kainahola weir, near Kealia, Kauai, for 1913. Month. Discharge in million gallons per day. Run-off (total in acre-feet). Maximum. Minimum. Mean. 0.41 .58 .58 .49 .49 .96 .41 .41 .58 .41 .67 1.01 0.41 .41 .38 .41 .41 .41 .41 .41 .41 .41 .41 .41 0.41 .43 .41 .42 .41 .44 .41 .41 .42 .41 .45 .48 39 37 Maroh ' 39 39 39 June 41 July 39 39 September 39 October 39 41 December 46 The year 1.01 .38 .42 477 KAPAA RIVER NEAR KEALIA, KAUAI. Location. — About 1 mile above intake of Kapabi ditcb and 5 miles nortbwest of Kealia. Records available. — ^July 23, 1910, to December 31, 1913. Drainage area. — 3.6 square miles. G-age. — Vertical staff. Control. — Fairly permanent. Discharge measurements. — ^Made from wire suspension footbridge or by wading. Accuracy. — Records good except for November and December, when records were fair. Cooperation. — Station is maintained in cooperation witb the Makee Sugar Co. The following discharge measurement was made by W. V. Hardy: May 20, 1913: Gage height, 1.54 feet; discharge, 14.1 second-feet. Daily discharge, in second-feet, of Kapaa River near Kealia, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. 17 12 12 22 13 16 23 14 32 13 15 20 12 12 20 30 153 54 15 20 13 34 15 12 12 23 14 155 24 14 44 13 24 13 12 11 20 16 78 33 13 18 13 18 13 12 11 16 13 38 33 13 17 12 18 14 158 12 14 32 38 19 13 32 23 16 18 46 24 13 23 24 17 17 20 37 36 28 21 14 13 51 20 16 16 17 30 22 19 16 13 24 27 42 17 21 16 48 115 20 14 12 17 17 23 14 16 15 17 48 17 15 11 22 16 32 15 14 14 20 44 42 13 11 14 48 20 19 17 16 19 64 96 13 13 31 115 23 33 23 14 26 60 26 12 12 45 36 22 24 41 14 19 26 21 13 11 35 21 21 17 19 14 20 20 51 14 14 20 32 24 17 31 14 18 21 21 13 13 52 39 18 16 18 13 16 21 17 86 13 29 33 18 14 14 13 36 31 16 36 13 23 19 16 19 14 13 17 71 14 36 16 17 16 14 19 14 13 15 127 64 18 19 17 15 14 17 21 15 38 631 46 18 26 17 14 14 14 17 14 168 121 19 32 95 19 13 14 14 16 13 29 62 20 28 105 15 16 13 16 17 13 20 76 18 16 121 19 16 13 22 21 12 20 127 16 14 62 14 14 22 28 21 12 18 67 16 13 24 13 13 49 27 16 12 16 51 14 13 20 13 16 37 16 22 48 41 39 14 18 15 14 20 34 44 13 21 26 13 18 15 28 37 18 34 14 17 62 12 18 15 17 30 16 Dec. 1.. 2.. 3.. 4.. 5.. 6.. 7.. 8.- 9.. 10.. 11.. 12.. 13.. 14.. 15.- 16-- 17-. 18.. 19.. 20.. 21.. 22.- 23.. 24.. 25.. 26.. 27.. 28-. 29.. 30.. 31.. 27 21 220 139 42 60 38 29 22 20 18 17 17 16 15 13 13 14 13 13 13 13 13 12 12 12 12 12 12 12 12 60 WATER EESOUROES OF HAWAII, 1&13. Monthly discharge of Kapaa River near Kealia, Kauai, for 1913. Month. January February March April May June July August September October November December The year Discharge in second-feet. Maximum. Minimum. Mean 96 158 121 52 115 155 54 44 48 168 631 220 24.2 25.6 25.4 20.9 25.3 34.3 21.5 19.9 17.8 26.7 69.8 29.1 28.2 Run-off (total in acre-feet). 1, 490 1,420 1,560 1,240 1,560 2,040 1,320 1,220 1,060 1,640 4,150 1,790 20,500 Accu- racy. AKULIKULI SPRING NEAR KEALIA, KAUAI, Location. — About 5 miles west of Kealia. Records available. — April 1, 1911, to December 31, 1913. Gage. — ^Vertical staff. Discharge measurements. — ^Made witli a 3-foot sharp-crested weir. Cooperation. — Station maintained and daily-discharge record furnished by the Makee Sugar Co. Discharge, in million gallons per day, of Akulikuli Spring near Kealia, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 2 3 0.67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .76 .71 .71 .67 3.39 1.06 .76 .76 .67 .71 .71 .67 .67 .67 .67 .67 .67 .67 .62 .62 0.62 .62 .62 .62 .62 1..59 2.08 .81 .67 .67 .67 .67 .67 .67 .67 .67 .67 2.21 .91 .81 .67 .67 .71 .96 .67 .67 .67 .67 0.67 .67 .62 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .58 .71 2.36 1.06 .81 .81 .71 .71 .71 .67 .67 0.67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .96 .76 1.52 .86 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 0.67 .67 .67 .67 .67 .67 1.06 .81 1.34 .81 .67 1.34 1.52 .81 .81 .81 .91 .81 .71 .67 .67 .67 .67 .67 .67 .67 .58 .58 .58 .58 .58 0.58 .58 4.22 3.63 2.64 1.95 1.06 .96 1.06 .81 .71 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 1.23 .91 .81 0.67 1.76 1.34 1.34 .96 .81 .81 .67 .67 .67 .67 .67 .81 .76 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 0.67 .67 .67 .6V .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .81 .81 .76 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 0.76 .71 1.64 1.28 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .62 .62 .62 .62 .62 .62 .62 .62 .62 .96 .67 .67 0.67 .67 .67 , .62 .58 .58 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .76 .67 .67 .67 .67 1.23 1.28 .67 .67 0.67 .67 .67 .67 .67 .67 .76 .67 .71 .67 .67 .67 .67 .67 .67 .67 .67 .67 .67 .81 2.43 1.34 1.06 .96 1.06 .81 .67 .67 .67 .67 1.06 .81 1.64 4 1.95 5 1.34 6 1.17 7 1.06 8 .96 9 .81 10 11 12 .81 .81 .76 13 .67 14 .67 15 .67 16 .67 17 .67 18 .67 19 . . .67 20 .67 21 .67 22 .67 23 .67 24 .67 25 . .67 26 .67 27 .67 28 .67 29 .67 30 .67 31 .67 ISLAND OF KAUAI. 61 Monthly discharge of Akulikuli Spring near Kealia, Kauai, for 1913. Month. Discharge in million gallons per day. Run-ofl (total in . Maximum. Mtaimum. Mean. acre-feet). 3.39 2.21 2.36 1.52 1.52 4.22 1.76 .81 1.64 1.28 2.43 1.95 0.62 .62 .58 .67 .58 .58 .67 .67 .62 .58 .67 .67 0.78 .83 .70 .72 .78 1.06 .77 .68 .72 .70 .80 .84 74 71 67 April 66 May 74 98 July 73 65 66 67 74 80 4.22 .58 .78 875 KAPAHI DITCH AT KAPAHI, NEAR KEALIA, KAUAI. Location. — ^About 4 miles west of Kealia and 500 feet below diversion dam on Kapaa River. Records available. — April 15, 1909, to December 31, 1913. Gage. — Watson water-stage recorder. Discharge measureraents. — ^There is a 20-foot sharp-crested weir immediately below the gage, but current-meter measurements give a different rating from the weir formula, and the meter rating is used. Diversion. — Ditch diverts part of flow of Kapaa River. Accuracy. — Records good. Cooperation. — Station is maintained in cooperation with the Makee Sugar Co. Daily discharge, in secondfeet, of Kapahi ditch at Kapahi, near Kealia, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 16.9 27.0 14.8 13.0 12.4 14.2 19.2 27.0 20.0 20.0 24.0 46.5 72.0 32.5 31.0 51.0 24.0 16.9 14.8 14.2 ■ 54.0 26.0 17.6 29.0 25.0 17.6 15.5 14.2 13.0 12.4 10.6 10.6 10.6 10.6 10.6 10.6 138 60.0 17.6 16.2 14.8 16.2 13.0 10.6 10.6 13.0 14.2 11.8 66.0 43.5 26.0 20.0 18.4 48.0 36.0 15.5 13.6 12.4 11.8 11.2 10.6 10.0 9.0 9.5 10.0 18.4 16.9 13.0 10.6 9.5 9.5 10.0 10.0 9.5 11.8 11.2 10.6 10.0 13.0 17.6 25.0 74.0 60.0 7.0 7.5 6.5 7.0 12.4 7.5 13.6 14.2 17.6 15.5 13.6 14.2 13.0 12.4 11.8 22.4 16.2 20.0 14.2 42.5 60.0 59.0 21.6 42.5 45.0 27.0 17.6 16.2 16.2 17.6 13.6 20.0 14.2 12.4 11.8 14.2 14.2 10.0 22.4 14.8 14.8 13.0 45.0 36.0 43.5 30.0 18.4 38.5 18.4 5.0 3.5 3.5 5.5 7.0 7.0 11.2 12.4 12.4 13.6 13.0 16.9 16.2 13.6 13.6 15.5 13.6 24.0 14.2 14.8 23.2 93.0 6.0 10.0 12.4 12.4 18.4 17.6 14.2 17.6 20.0 23.2 23.2 21.6 26.0 18.4 16.9 15.5 14.2 14.2 13.6 13.6 13.0 13.0 19.2 45.0 31.0 25.0 42.5 26.0 71.0 29.0 31.0 27.0 20.0 16.9 14.8 16.2 13.6 13.6 16.2 37.5 28.0 17.6 16.9 14.8 13.6 26.0 20.8 1.5.5 13.6 12.4 15.5 21.6 23.2 24.0 16.2 36.0 16.9 15.5 14.2 14.2 12.4 11.8 11.2 11.8 17.6 14.2 18.4 14.2 13.0 16.9 22.4 16.9 15.5 14.8 13.6 13.0 14.2 13.6 32.5 17.6 30.0 17.6 38.5 23.2 43.5 16.9 14.8 23.2 27.0 20.0 18.4 16.2 21.6 33.5 27.0 18.4 15.5 13.6 12.4 12.4 14.2 11.8 12.4 12.4 11.8 11.2 11.2 11.2 11.2 10.6 12.4 11.8 11.2 10.6 10.6 10.6 40.0 12.4 11.8 11.8 11.2 10.6 10.0 10.0 17.6 24.0 31.0 33.5 35.0 19.2 16.9 21.6 18.4 20.8 16.2 14.8 22.4 16.2 13.0 38.5 82.0 31.0 20.0 18.4 16.2 13.6 43.5 23.2 1.5.5 14.2 12.4 18.4 22.4 16.2 15.5 14.2 24.0 20.8 17.6 16.2 24.0 20.8 20.8 21.6 18.4 14.8 18.4 18.4 19.2 11.8 14.2 14.8 14.2 13.6 12.4 13.0 32.5 53.0 16.2 15. 5 36.0 2 24.0 3 10.6 4 9.5 5 7.5 6 7.5 7 20.8 8 36.0 9 27.0 10 22.4 11 20.0 12 18.4 13 :... 17.6 14 16.9 15 16.2 16 14.8 17 . ... 14.8 18 16.2 19 14.8 20 14.2 21 14.8 22 14.2 23 13.6 24 13.6 25 13.0 26 13.0 27... 13.0 28 13.0 29 13.0 30 13.0 31 13.0 62 WATER EESOUECES OF HAWAII, 1913. Monthly discharge of Kapahi ditch at Kapahi, near Kealia, Kauai, for 1913. Month. DisehauTge in second-feet. Maximum. Minimum. Mean. Run-off (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 72.0 138 74.0 60.0 45.0 93.0 71.0 43.5 40.0 82.0 53.0 36.0 138 10.6 10.6 6.5 11.8 3.5 6.0 12.4 11.2 10.6 10.0 11.8 7.5 3.5 24.1 25.0 14.9 21.7 17.0 21.6 22.0 18.7 15.3 22.3 18.8 16.5 19.8 1,480 1,390 916 1,290 1,050 1,290 1,350 1,150 910 1,370 1,120 1,010 14,300 KANEHA DITCH NEAR KEALIA, KAUAI. Location. — About 5 miles northwest of Kealia, a short distance below the outlet from the Kaneha reservoir. Records available. — January 1, 1909, to December 31, 1913. Gage.— Staff. Discharge measurenients. — Made with a 20-foot sharp-crested weir. Accuracy. — Records poor. Cooperation. — Station is maintained in cooperation with the Makee Sugar Co. Daily discharge, in second-feet, of Kaneha ditch near Kealia, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 1.9 1.9 2 2 16 4.8 2.2 12 35 26 8.3 8.8 7.8 10 11 11 6.4 6.0 6.0 6.0 6.8 6.0 5.6 5.2 4.8 4.4 2.2 4.0 2.2 1.6 1.6 11 6.4 5.6 6.8 5.6 5.2 6.2 5.6 6.4 6.0 5.6 4.8 4.8 3.2 2.8 3.6 11 9.5 7.3 7.3 8.8 8.6 8.3 6.8 6.0 4.8 6.0 6.0 5.6 9.5 10 8.3 9.5 7.3 5.2 5.2 6.8 7.8 7.3 6.8 6.8 6.8 8.3 11 7.8 6.0 5.6 4.8 6.0 5.6 6.0 5.6 4.8 6.4 7.3 7.3 6.4 5.2 6.0 7.8 7.3 7.8 10 9.0 13 8.8 20 10 8.8 13' 22 13 9.0 7.3 6.4 6.0 5.6 6.0 6.4 6.0 6.4 6.8 3.2 2.8 3.2 3.2 10 4.0 3.6 4.8 5.2 4.0 3.2 4.4 4.0 3.6 3.6 3.2 3.2 6.4 4.4 3.6 12 22 21 12 7.3 5.2 6.4 7.8 7.3 9.0 10 7.8 13 14 6.0 5.6 12 8.3 6.4 4.8 4.4 5.2 4.0 3.6 5.2 3.2 1.6 7.8 6.0 6.4 6.4 6.0 8.3 6.4 6.0 5.6 6.0 7.3 5.2 3.2 1.9 1.6 20 15 5 6 2 5 6 3 6.8 4 10 5 3.6 4.0 7.3 6 8.3 7 7.8 8 8.8 9 7.3 10 ft 4 11 6.0 12 11 6.8 12 6.8 5.2 6.0 13 6.0 14 6.4 15 6.0 16 4.8 17 13 11 7.8 5.2 4.4 3.6 3.2 3.2 2.8 2.5 2.5 2.5 3.2 4.0 5.2 4.4 18 4.4 4.4 4.4 8.3 4.4 19 4.4 20 3.6 21 3.2 22 3.2 23 5.2 4.0 3.6 3.6 3.6 3.2 24 4.4 25 4.4 4.4 4.8 26 ^'>. 27 4.8 28 3.6 29 2.5 30 2.5 31 2.5 Note.— No record Jan. 1-4,7-11, 17,22-24,27-31; Feb. 5-22; Feb. 28-May 16; Oct. 4-10, 28-31. interpolated May 18-20 and July 18. Discharge ISLAND OF KAUAI. 63 Monthly discharge of Kaneha ditch near Kealia, Kauai, for 191S. Month. Discharge in second-feet. Maximum. Minimum. Mean. Eun-off (total in acre-feet). Accu- racy. January 5-6, 12-16, 18-21, 25-26 February 1-4, 23-27 May 17-31 June July August September October 1-3, 11-27 November December 3.6 1.9 2.5 1.6 2.8 4.8 2.8 3.2 1.6 2.5 6.13 4.67 4.94 7.85 6.60 7.14 7.06 8.96 6.31 5.35 The period . 158 83 147 467 406 439 420 355 375 329 3,180 ANAHOLA RIVER ABOVE DAM AT KIOKALA, NEAR KEALIA, KAUAI, Location. — About one-fourth mile above dam at Kiokala and 6 miles northwest of Kealia. Records available.^ — August 22 to November 2, 1910; December 28, 1912, to Decem- ber 31, 1913. December 15, 1910, to December 28, 1912, at dam at Kiokala. Drainage area. — 5.3 square miles. Gage. — Friez water-stage recorder August 22 to November 2, 1910, and December 28, 1912, to December 31, 1913. From December 15, 1910, to December 28, 1912, an inclined staff gage. Control. — Permanent. Discharge measurements. — Made by wading and from foot bridge. Accuracy. — Records good for January and from May to August; for other months fair. Cooperation. — Station maintained in cooperation with the Makee Sugar Co. The following discharge measurement was made by W. V. Hardy: May 19, 1913: Gage height, 1.24 feet; discharge, 24.5 second-feet. Daily discharge, in second-feet, of Anahola River above dam at Kiokala, near Kealia, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 19 56 19 15 20 16 15 21 15 13 21 36 61 30 28 30 19 17 15 16 28 36 16 15 19 15 15 13 12 12 11 10 9.5 9.2 9.3 10 142 53 21 16 17 17 13 12 11 12 15 11 63 52 33 23 22 34 25 20 17 15 15 13 13 12 11 11 11 12 25 17 11 11 10 10 10 10 13 10 10 10 11 17 20 127 135 136 67 39 33 27 21 19 20 16 16 16 13 12 12 11 15 13 13 14 46 61 48 22 36 34 27 16 15 IS 18 13 14 11 9.9 10 9.6 9.6 9.6 17 11 9.6 9.6 34 26 35 22 15 67 74 35 45 29 41 41 40 26 22 20 18 17 18 18 17 16 15 15 15 14 13 17 97 62 30 23 21 20 24 26 29 20 23 18 17 20 18 17 15 14 13 13 13 13 13 13 28 19 15 18 17 33 18 21 22 13 12 12 12 11 10 11 26 20 13 12 11 11 14 16 12 11 11 14 30 18 31 15 18 15 13 12 12 11 11 10 10 11 12 17 12 10 13 13 13 15 24 15 14 12 11 16 12 11 13 22 13 17 17 19 15 21 17 20 51 17 17 44 22 15 13 13 12 12 12 13 18 13 12 12 14 13 13 13 12 12 11 11 11 23 11 10 12 13 10 9.6 9.6 11 17 23 28 15 13 13 20 17 20 17 13 13 11 10 12 49 57 22 17 15 13 28 14 12 12 10 30 15 13 11 11 57 23 35 24 32 26 26 17 15 15 16 16 46 137 176 61 52 57 89 73 49 43 49 55 37 2 30> 3 211 4 174 5 87 6 93 7 75 8 53 9 37 10 30 11 26 12 22 13 22 14 15 16 17 18 19 20 21 22.... 23 24 25 26 27 28 29 30 31 Note.— No record Dec. 14-31. Discharge interpolated Mar. 28-29 and Noiv. 29. 64 WATER EESOURCES OF HAWAH, 1913. Monthly discharge of Anahola River above dam, at Kiohala, near Kealia, Kauai, for 1913. January February March April May June July August September October November December 1-13. Month. The period Discharge in second-feet. Maximum. Minimum. Mean 61 142 136 61 74 97 33 24 51 57 176 211 11 9.2 10 9.6 9.6 13 10 10 10 9.6 10 22 21.7 25.2 28.5 19.6 25.5 22.7 i6.2 14.0 16.2 17.6 42.6 69.0 Run-off (total in acre-feet). 1,330 1,400 1,750 1,170 1,570 1,350 996 861 964 1,080 2,530 1,780 16, 800 Accu- racy. ANAHOLA DITCH AT KIOKALA, NEAR KEALIA, KAUAI. Location. — About 6 miles northwest of Kealia. Records available.— May 10, 1909, to December 31, 1913. Gage. — Watson water-stage recorder. Discharge measurements. — Made with 10-foot sharp-crested weir. Accuracy. — Records good . Cooperation. — Station maintained in cooperation with the Makee Sugar Co. Daily discharge, in second-feet, of Anahola ditch at Kiohala, near Kealia, Kauai, for 1913. Day.' Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 2 3 12.1 13.6 13.2 11.8 11.8 12.1 10.7 12.8 11.8 11.8 10.4 13.2 14.3 12.8 12.5 13.2 11.4 10.1 9.4 10.1 11.4 14.0 11.8 10.7 11.1 11.1 10.7 8.7 7.8 7.5 7.2 6.6 6.3 6.0 6.0 7.5 15.9 15.1 12.8 12.1 11.4 12.5 10.1 8.7 11.4 9.0 10.4 8.4 14.3 12.5 13.6 12.5 12.5 13.2 12.8 12.1 11.4 10.7 9.7 9.4 8.7 8.1 7.8 7.2 8.1 8.4 10.7 11.1 7.8 6.9 6.3 6.3 6.0 6.0 8.4 6.3 6.0 5.5 6.9 10.7 11.4 6.0 .4 .1 '""s.'s' 13.6 13.2 13.2 12.5 12.5 12.1 11.8 11.1 10.4 10.1 11.8 10.7 11.4 10.1 14.0 14.7 15.1 13.2 13.6 14.0 13.2 12.1 12.1 12.5 12.1 11.1 11.1 10.7 9.4 9.7 9.4 9.0 8.7 11.8 9.7 8.7 8.1 11.8 13.2 14.0 12.8 12.1 12.5 16.7 8.1 "'4.'2' 10.4 10.1 9.7 9.7 9.7 9.4 9.4 9.4 9.4 9.0 9.0 8.7 9.0 8.7 9.4 9.4 14.7 13.6 12.5 11.8 11.4 11.1 11.4 11.8 11.8 11.1 10.7 10.7 10.7 11.1 10.7 10.7 10.4 9.7 9.0 9.0 8.7 8.4 8.7 8.7 10.1 11.1 10.4 11.1 11.1 12.5 11.8 11.8 12.1 10.4 10.1 9.4 9.7 8.4 7.5 7.5 11.8 12.1 9.7 8.1 7.2 7.2 8.7 10.7 7.8 6.9 6.9 7.8 14.0 12.8 14.3 10.7 12.5 10.7 9.4 7.8 7.8 6.9 6.6 6.0 6.5 5.7 7.2 11.1 7.8 6.0 7.8 9.7 8.4 10.4 12.1 10.4 9.4 6.9 5.5 8.7 6.0 5.2 6.3 12.5 8.1 9.0 10.7 12.1 9.4 11.8 11.1 10.1 17.1 17.2 17.4 17.5 14.0 10.7 9.0 7.8 7.2 6.0 6.0 7.5 11.1 7.2 6.0 5.7 6.9 5.7 6.3 5.7 5.5 4.7 4.4 3.9 4.2 9.7 5.7 4.4 5.7 6.6 4.2 3.4 3.4 4.7 8.4 12.1 12.1 8.7 6.3 6.3 9.7 8.7 10.4 9.4 6.3 5.2 4.7 4.2 6.0 9.7 14.7 13.2 11.8 9.4 7.2 11.8 8.1 6.0 5.2 4.4 7.8 9.0 7.5 6.6 5.7 9.7 10.1 10.7 10.1 10.4 10.1 10.1 9.0 8.4 8.1 8.7 8.4 10.1 13.2 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 .. . 19 20 21 22 23 24 25 26 27 28 29 - 30 31 JvToTK.— No record Mai. .-26-28, May 14-16, and Nov. 21 to Dec. 31. Discharge Sept. 4 and 6 interpolated. ISLAND OF KAUAI. ' 65 Monthly discharge of Anahola ditch at Kiokala, near Kealia, Kauai, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean, Run-off (total in acre-feet). Accu- racy. January.. February. March April May. June... July August , September October , November 1-20... The period. 14.3 15.9 13.6 15.1 16.7 14.7 14.3 12.5 17.5 14.7 13.2 7.2 6.0 .1 9.0 4.2 8.4 6.9 6.2 3.9 3.4 4.4 11.7 10.9 7.60 11.8 10.1 10.7 10.1 8.35 8.52 7.86 8.90 719 605 422 702 563 637 621 513 507 483 353 KALIHIWAI RIVER NEAR KILAUEA, KAUAI. Location. — One-half mile below Hoopouli Falls, about 2 miles west of Kilauea, and about 5 miles above mouth of river. Reached by saddle horse on trail from Princeville ranch. Records available. — August 21, 1912, to December 31, 1913. Drainage area. — 3.9 square miles. Gage. — ^ Vertical staff. Control. — Probably permanent. Discharge measurements. — ^Made by wading. Accuracy. — Records fair except for November and December, 1913, when they were poor. Cooperation. — Station is maintained in cooperation with the Princeville ranch. Discharge measurements of Kalihiwai River near Kilauea, Kauai, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Apr. 18 Apr. 19 D. E. Homer Feet. 6.76 6.62 Sec: ft. 76.8 Apr. 20 May 23 D. E. Homer Feet. 6.44 6.08 Sec. ft. 46.8 do W.V.Hardy 24.1 Daily discharge, in second-feet, of Kalihiwai River near Kilauea, Kauai, for 1912-13. Day. Aug. Sept. Oct. Nov. Dec. Day. Aug. Sept. Oct. Nov. Dec. 1912. 1 . ... 29 32 29 29 29 46 32 29 29 29 29 29 27 25 25 24 24 23 22 22 23 24 98 36 25 24 24 24 24 23 25 24 24 24 25 32 24 24 32 24 24 24 24 24 25 28 36 76 2,500 224 76 46 46 41 41 38 36 36 46 41 1912. 16 25 25 25 58 58 24 23 23 24 22 22 22 22 22 23 25 24 24 29 46 76 25 29 36 32 34 32 29 28 27 26 24 24 29 25 111 29 28 25 27 25 25 24 27 29 25 36 2 17 39 3 18 44 4 19 41 5 20 . .. . 36 6 21 22 23 24 25 26 27 28 29 30 31 29 124 36 29 29 29 98 36 41 36 32 36 7 36 8 52 9 46 10 46 11 44 12 41 13 36 14 35 15 34 29 97764°— wsp 373—15- 66 WATEE EESOUKCES OP HAWAII, 1913. Daily discharge, in second-feet, ofKalihiwai River near Kilauea, Kauai, for 1912-13 — Con. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1913. 1 29 29 28 27 29 36 36 41 36 48 46 187 98 58 52 46 41 38 98 98 111 98 76 58 41 32 29 25 24 24 24 24 23 23 24 24 750 98 36 29 24 24 23 23 22 23 24 24 244 154 46 29 29 29 29 24 27 25 111 24 24 24 23 23 23 24 25 23 22 22 22 22 22 22 23 23 24 23 23 25 32 348 390 400 308 76 58 41 41 38 36 36 36 36 27 26 25 24 32 29 32 32 34 67 62 54 111 119 85 52 38 38 46 41 80 63 46 41 41 39 41 87 63 38 25 264 46 62 41 36 50 80 36 32 46 62 80 38 29 29 26 25 25 24 23 22 21 21 20 19 18 18 18 98 46 29 25 25 26 32 30 29 29 27 32 36 36 36 32 30 29 27 27 25 24 24 23 244 41 52 41 41 36 52 41 35 35 32 32 31 30 29 29 48 46 38 38 36 29 27 26 25 32 24 24 52 41 32 29 27 26 25 25 24 24 23 23 23 23 22 24 24 24 41 48 41 36 27 26 24 23 23 24 24 24 24 24 24 24 27 48 39 35 36 1,050 46 38 32 30 30 29 32 30 29 27 26 25 25 24 32 32 24 32 24 24 23 23 23 23 22 22 22 22 22 21 21 21 21 21 37 32 31 29 27 25 25 25 24 24 24 24 23 36 32 29 72 58 36 29 24 28 27 27 26 25 25 25 24 25 26 31 32 37 39 50 400 500 187 154 111 76 62 700 1,100 550 650 400 308 600 187 154 124 2,050 600 400 2 264 3 1,450 4 224 5 154 6 187 7 180 8 174 9 50 10 46 11 41 12 39 13 36 14 34 15 31 16 29 17 29 18 29 19 28 20 28 21 28 22 27 23 24 24 24 25 24 26 24 27 23 28 23 29 22 30 22 31 22 Monthly discharge of Kalihiwai River near Kilauea, Kauai, for 1912-13. Month. Discharge in second-feet. Maximum. Minimum. Mean, Run-off (in acre-feet). Accu- racy. 1912, August 21-31 September October November , December 1913. January February March April May June July August September October November December The year 124 58 111 2,500 187 750 400 119 264 244 52 48 1,050 72 2,050 1.450 47.2 28.9 31.0 28.5 127 53.0 70.2 71.5 47.6 46.1 39.7 33.8 27.9 61.9 29.1 308 120 1,030 1,720 1,910 1,700 7,810 ■3,260 3,900 4,400 2,830 2,830 2,360 2,080 1,720 3,680 1,790 18,300 7,380 2,050 75.4 54,500 ISLAND OF KAUAI. 67 HANALEI RIVER NEAR HANALEI, KAUAF. Location. — ^About 5 miles up the river from Hanalei. Records available. — December 28, 1911, to December 31, 1913. Drainage area. — 19.2 square miles. Gage.— Staff. Control. — Probably permanent. Discharge measurements. — Cable and car or by wading. Accuracy. — Records good for January, February, April, May, August, September, and October; for other months fair. Discharge measurements of Hanalei River near Hanalei, Kauai, in 1913. Date. Hydrographer. • Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Mar. 25 Hardy and Homer W.V.Hardy Feet. 7.90 6.75 Sec.-ft. 1,160 214 Nov. 12 W. V. Hardy Feet. 8.50 Sec.-ft. 1,620 28 Daily discharge, in second-feet, of Hanalei River near Hanalei, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 124 158 158 124 124 124 124 124 124 158 124 158 302 158 158 124 124 124 124 158 124 124 124 124 124 124 124 124 124 124 124 124 124 124 124 158 200 124 124 124 124 124 124 93 93 93 93 124 291 158 124 124 124 93 124 124 93 93 93 93 93 93 93 93 93 124 124 93 93 93 93 93 93 93 93 93 93 124 124 124 124 124 910 910 655 124 224 93 124 124 93 93 124 124 93 93 93 124 124 124 124 93 158 124 124 93 93 93 93 93 93 93 93 93 124 93 124 124 124 158 93 158 93 93 124 124 200 124 124 124 124 200 124 124 124 124 124 124 124 124 124 124 124 124 96 93 93 93 124 124 93 93 93 825 124 124 124 124 124 158 124 124 124 158 124 124 364 124 124 93 93 124 124 124 124 124 124 364 124 124 124 124 1,180 364 364 364 124 124 124 124 124 124 124 248 200 158 124 124 158 124 93 93 93 124 124 124 93 158 124 93 93 93 93 93 93 93 93 124 124 124 124 93 93 124 158 158 124 248 158 124 93 93 124 124 93 124 124 115 124 364 158 248 200 158 248 158 124 124 124 158 124 124 93 93 124 124 124 93 93 93 93 124 93 93 93 93 93 68 68 68 158 124 124 124 93 93 93 93 93 248 200 124 93 93 93 124 124 124 93 93 124 93 93 93 93 93 93 124 124 124 124 93 93 124 93 248 158 124 93 93 200 158 158 500 364 955 200 158 124 124 124 158 248 910 200 158 158 158 200 200 124 93 93 158 124 2 124 3 825 4 124 5 124 6 124 7 124 8 124 9 93 10 93 11 93 12 93 13 93 14 93 15 93 16 93 17 93 18 93 19 93 20 93 21 93 22 93 23 93 24 93 25 93 26 93 27 93 28 93 29 93 30 93 31 124 68 WATER EESOUECES OF HAWAII^ 1913. Monthly discharge of Hanalei River near Hanalei, Kauai, for 1913. Month. Discharge ia second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 302 291 910 158 200 825 1,180 364 248 248 955 825 124 93 93 93 93 93 93 93 137 126 178 110 122 162 184 136 116 112 224 125 8,420 7,000 10, 900 6,550 7,500 9,640 11, 300 8,360 6,900 6,890 13, 300 7,690 104,000 KUNA DITCH NEAR HANALEI, KAUAI. Location. — ^About 4 miles up the river from Hanalei and 500 feet below diversion from Hanalei River. Records available. — January 17, 1912, to September 30, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made from footbridge. Accuracy. — Records fair. Discharge measurements of Kuna ditch near Hanalei, Kauai, in 1913. Date. Hydrographer. Gage height. Dis- Mar. 26 Aug. 26 W. V. Hardy. do Feet. 4.S 4.e Sec.-ft. 23.8 19.4 Daily discharge, in second-feet, of Kuna ditch near Hanalei, Kauai, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. 5.0 4.5 22 22 22 27 34 22 5.7 4.5 22 22 24 26 48 22 5.7 4.5 22 24 22 29 38 22 5.7 4.5 22 24 22 28 38 22 5.0 5.7 22 22 22 28 38 23 5.0 7.4 22 22 22 28 35 23 5.0 4.5 24 22 24 27 35 23 4.5 4.5 24 24 22 27 35 23 4.5 4.5 22 24 22 28 35 23 5.0 4.5 22 24 22 28 34 22 4.5 4.5 22 24 22 28 34 22 5.0 4.5 22 22 24 27 34 23 6.5 22 22 26 22 28 35 24 5.0 22 22 24 22 28 34 24 5.0 22 22 24 22 28 32 23 5.0 22 22 22 22 31 32 27 5.0 24 22 22 22 28 34 23 5.0 24 22 22 22 28 36 24 5.0 24 24 22 22 28 35 23 5.7 24 24 22 22 28 31 22 5.0 24 24 22 22 28 31 23 5.0 24 24 22 22 30 31 23 5.0 22 24 •22 22 30 32 22 5.0 24 42 22 22 30 32 23 5.0 24 30 22 21 30 34 24 5.0 22 26 22 21 30 32 21 5.0 22 24 22 28 38 32 24 5.0 22 22 22 29 32 26 29 5.0 22 22 28 32 22 25 4.5 24 24 28 32 22 27 4.5 24 28 22 26 Sept. 1 2 3 4 5 6 7 8, 9 10 11, 12 13, 14 15, 16. 17, 18, 19, 20 21, 22, 23, 24 25 26, 27 28 29, 30 31 25 29 25 24 24 24 25 24 24 23 24 24 24 13 13 13 13 13 13 13 13 13 13 11 11 11 13 14 13 13 ISLAHD OF KAUAI. Monthly discharge of Kuna ditch near Hanalei, Kauai, for 1913. 69 Month. Discharge in second-feet. Rim-oflf (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. January . 6.5 24 42 26 29 38 48 29 29 4.5 4.5 22 22 21 26 22 22 11 5.06 15.2 23.7 22.7 23.1 29.0 33.0 23.5 18.2 311 844 1,460 1,350 1,420 1,730 2,030 1,440 1,080 C. C. B. April . B. B. B. July B. B. September . B. 11,600 WAINEEA EIVER (eAST AND WEST CHANNELS) AT POWER HOUSE, NEAR WAINIHA, KAUAI. Location. — About 2 miles south of Wainiha and just northeast of Kauai Electric Co.'s power house. Becords available. — East Channel, February 25, 1912, to December 31, 1913; West Channel, December 30, 1911, to December 31, 1913. Drainage area. — 14.7 square miles. Gage. — ^Two inclined timber gages — one on each channel — to obtain the total flow of the river at this point. Control. — Two large channels, both rocky and probably permanent. The natives build fish dams at the point where the river divides above the stations, and this shifts the water from one channel to the other. Discharge raeasurements. — Made from wire suspension footbridge over each channel, or by wading. Accuracy. — East Channel, records fair; West Channel, records good. Cooperation. — Stations maintained in cooperation with the Kauai Electric Co. Discharge measurements of east channel of Wainiha River near Wainiha, Kauai, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Mar. 31 W.V.Hardy D.E. Homer W. V. Hardy.. Feet. 6.73 6.72 6.59 Sec.-ft. 10.3 12.7 5.9 Nov. 13 Nov. 14 W. V. Hardy Feet. 9.30 8.10 Sec.-ft. 407 Apr. 24 Au?. 23 do 106 70 WATER RESOURCES Of HAWAII, 1913. Daily discharge, in second-feet, of east channel of Wainiha River near Wainiha, Kauai, f of 1912-13. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1912. 1913. 16 34 28 20 50 37 37 112 12 10 74 94 57 66 70 50 70 134 256 642 1S5 106 74 46 34 20 14 4 23 10 6 28 349 37 23 34 18 16 16 175 50 37 34 10 10 28 18 12 31 31 94 256 366 242 74 57 66 43 34 37 20 43 23 50 40 23 14 10 10 10 10 18 18 70 53 84 79 206 46 100 46 10 16 18 26 23 28 34 14 10 10 10 14 119 74 28 26 20 14 14 16 31 18 23 16 14 23 256 89 28 18 7 157 37 43 70 89 43 34 12 12 10 10 10 16 20 37 12 27 115 126 46 217 57 40 17 106 15 12 12 16 12 12 16 10 20 12 7 8 12 10 18 157 57 66 61 23 26 18 U 10 14 12 20 230 34 7 7 7 18 26 16 14 9 10 79 66 66 119 94 46 40 34 18 12 242 43 18 18 10 35 26 45 46 106 40 28 14 16 217 34 34 18 23 31 7 7 7 6 6 10 31 242 23 10 10 10 61 18 10 18 7 7 7 7 7 10 79 141 18 12 7 7 7 16 12 10 12 26 16 141 149 100 20 12 10 119 141 18 29 40 40 16 12 94 28 141 61 485 106 126 126 149 66 2,250 332 100 270 185 217 485 230 63 70 620 79 ISLAND 01? KAXTAl. 71 Monthly discharge of east channel of Wainiha River near Wainiha, Kauai, for 1912-13. Month. Discharge in second-feet. Maximum. Minimum. Mean Rim-off (total in acre-feet). Accu- racy. February 25-29. March April May June July August September October November December The period. January February.. March April May , June July August September . October November. December.. 1913. The year. 16 642 366 256 23 217 230 242 217 149 1,320 112 34 175 206 157 94 157 66 84 242 2,250 464 11.8 86.4 52.4 33.8 15.5 34.6 33.1 20.9 30.9 37.9 104 21.1 11.1 25.4 42.5 27.7 20.7 26.5 17.0 12.0 18.8 272 70.2 46.9 117 5,310 3,120 2,080 922 2,130 2,040 1,240 1,900 2,260 6,400 27,500 1,300 616 1,560 2,530 1,700 1,230 1,630 1,050 714 1,160 16,200 4,320 34,000 Discharge measurements of west channel of Wainiha River near Wainiha, Kauai, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Aug. 23 W.V.Hardy do Feet. 5.50 6.19 Sec.-ft. 112 386 Nov. 13 W. V. Hardy Feet. 6.87 Sec.-ft. 242 Nov 13 n WATER EESOURCES OF HAWAII, 1&13. Daily discharge, in second-feet, of west channel of Wainiha River near Wainiha, Kauai, for 1912-13. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. 102 390 272 140 140 128 115 340 135 158 192 272 210 140 128 115 115 318 128 128 210 365 158 147 115 115 115 272 295 140 192 250 250 158 140 115 90 210 115 128 140 250 295 192 128 140 175 158 158 115 115 365 440 140 115 175 192 580 147 115 115 250 580 140 115 210 210 272 128 128 128 295 670 175 115 158 272 210 140 272 140 465 640 140 140 175 250 175 168 440 140 700 365 115 115 365 140 128 175 230 158 790 250 115 115 318 158 115 115 158 128 440 295 115 115 175 128 115 128 115 128 295 760 230 140 365 175 102 128 115 128 250 250 415 115 272 520 90 128 115 128 192 272 295 128 230 295 115 115 230 115 192 230 158 128 175 175 115 140 175 115 192 390 158 115 318 128 140 230 140 158 158 272 128 175 158 115 115 175 192 140 128 158 140 192 140 115 115 340 272 158 272 158 140 175 128 115 115 365 192 272 295 128 158 158 140 175 115 465 415 340 192 128 192 128 140 210 175 272 415 390 158 128 158 158 140 175 120 210 250 340 250 140 192 175 158 158 102 158 670 250 580 158 158 128 140 175 102 175 158 230 272 192 140 115 192 140 90 490 140 272 210 250 210 135 140 440 90 230 115 192 250 175 440 115 115 250 140 272 115 210 210 192 295 115 128 192 140 175 318 210 158 140 115 128 490 115 175 390 230 140 115 295 230 115 115 272 128 115 158 115 365 115 160 115 115 230 318 115 415 115 230 115 205 115 115 210 210 230 295 115 175 115 250 115 115 175 115 140 318 115 140 102 250 140 115 140 192 140 295 102 140 102 158 128 115 120 365 182 210 102 175 140 128 175 140 115 230 175 210 128 140 230 295 140 128. 115 210 115 175 175 115 580 230 115 115 192 140 175 140 192 128 250 415 115 115 175 115 318 128 115 115 140 318 115 115 295 102 272 115 115 115 140 730 115 115 272 272 175 128 175 140 140 730 102 115 520 230 192 295 192 115 295 670 102 115 490 140 210 340 272 115 175 230 115 115 490 115 175 192 192 115 140 250 115 115 340 128 210 158 295 115 175 250 140 230 465 175 115 140 175 115 115 272 295 135 230 230 115 128 140 115 115 230 295 158 192 158 140 140 120 140 115 580 230 175 158 115 115 140 128 115 115 440 192 158 158 128 128 128 140 115 128 210 140 175 135 115 115 115 128 128 115 415 140 680 102 128 115 115 115 115 115 440 272 640 128 140 115 140 128 115 128 440 192 730 365 128 175 192 192 115 115 550 135 390 140 128 250 192 140 110 115 365 128 272 175 128 250 158 140 102 115 210 115 230 210 115 210 140 158 175 110 175 210 192 115 140 210 318 115 115 490 175 250 175 158 115 272 115 115 175 175 115 115 210 115 90 115 140 115 140 115 115 175 140 128 90 115 175 140 115 90 90 90 1C2 175 128 102 140 115 115 128 140 140 295 210 175 140 140 128 415 192 340 295 295 465 272 340 210 158 140 135 140 140 140 128 115 115 115 128 115 115 115 158 ISLAi^D Of KAUAI. ^73 Monthly discharge of west channel of Wainiha River at power house, near Wainiha, Kauai, for 1912-13. Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-off (total in acre-feet). Accu- racy. 1912 January February March April May June July August September October November December The year 1913 January February March .> April May June July August September October November December The year 175 390 790 760 440 192 365 520 580 490 670 1,310 1,310 465 295 730 520 365 318 365 415 365 580 730 520 90 102 128 128 115 115 115 90 90 115 115 115 115 102 115 102 102 115 115 102 102 102 128 90 119 184 302 285 181 133 178 203 166 203 218 269 194 150 204 235 165 169 185 162 138 152 342 151 7,320 10,600 18, 600 17,000 11,100 7,910 10,900 12, 500 9,880 12, 500 13,000 16, 500 11,900 8,300 12,500 14,000 10, 100 10, 100 11,400 9,960 8,210 9,350 20,400 9,280 730 187 136,000 MISCELLANEOUS MEASUREMENTS. Measurements of streams on the island of Kauai at points other than regular gaging stations are listed below: Miscellaneous discharge measurements on Kauai during the year ending Dec. 31, 1913. Date. Stream. Tributary to— Locality. Gage height. Dis- charge. Feb. 9 Mohihi Waimea River . . . Elevation about 3,500 feet do Feet. 3.81 3.77 3.92 2.52 2.50 2.84 2.57 .60 .37 .38 1.21 1.09 7.70 3.20 3.35 3.64 Sec.ft. 3.04 Mar. 5 ....do do 2.47 July 6 Feb. 9 do -do .do 4.70 Waiakoali . . . .do ..do 3.03 Mar. 5 do do do 2.74 July 8 July 9 Apr. 30 July 28 Oct. 14 .do. .do. . .do 10.1 do . ...do do 3.53 Near Waimea 1.60 ..do ...do .62 29.0 June 21 Hanapepe ditch b ...do 15.5 Do... do do 15.2 May 26 Mar. 28 Near Kilauea 4.69 China ditch c Near Hanalei 25.1 Apr. 26 May 25 Aug. 26 Mar. 22 do do 26.5 .do .do 30.5 do do 19.8 Near Wainiha. ... 103 Mar. 30 . .do. . .do 131 Sept. 17 Oct. 21 do do 63.2 .do. .do 55.2 o Diverts from Waimea River. 6 Diverts from Hanapepe River. ■ Diverts from Hanalei River. 74 WATER RESOUSCES OE HAWAII^ 1913. ISLAND OF OAHTJ. KALIHI STREAM AT KIOI POOL, NEAR HONOLULU, OAHU. Location. — At Kioi Poolf about three-eightlis mile above Catholic Orphanage, 3 miles up Kalabi Road from King Street car line, and 5 miles north of Honolulu post office. Records available. — September 8 to December 31, 1913. Gage. — Gurley weight-driven register installed December 4 . September 8 to Novem- ber 22, 1913, Friez register. No record November 23 to December 3. Control. — On November 20 a flood lowered the control 0.35 foot; after December 8, probably permanent. Discharge measurements. — Made by wading or from suspension footbridge about 500 feet above station. Discharge measurements of KaliM Stream at Kioi Pool, near Honolulu, Oahu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Sept. 8 Sept. 27 Oct. 4 G. R.White Feet. 2.64 2.58 2.58 2.54 2.53 3.41 Sec.-ft. 2.37 1.71 1.29 1.06 .98 18.8 Nov. 8 Nov. 12 Nov. 22 Dec. 4 Dec. 11 Dec. 23 G. R.White . Feet. 3.22 3.76 2.88 5.08 2.95 2.50 Sec.-ft. 13.0 do do do do 29.0 11.8 Oct. 12 do do G K. Larrison 96.0 Oct. 25 J. C. Dort do 11.0 Nov. S do 5.26 Daily discharge, in second-feet, of Kalihi Stream at Kioi Pool, near Honolulu, Oahu, for 191S. Day. Sept. Oct. Nov. Dec. Day. Sept. Oct. Nov. Dec. 1 1.6 1.6 1.6 1.6 1.7 1.9 2.4 3.8 1.8 1.7 1.5 1.3 1.6 2.1 1.8 0.8 3.1 1.4 1.0 1.0 1.0 8.6 18 12 8.4 16 18 12 6.8 5.2 16 2.2 1.9 2.6 2.8 2.2 2.2 4.4 2.1 3.1 2.2 1.9 1.6 1.6 1.6 1.6 1.7 1.4 1.3 1.2 1.1 1.1 1.1 1.1 1.1 1.0 1.0 1.0 1.0 .9 .9 .8 4.4 4.4 5.0 13 28 18 9.8 6.9 2 17 7.3 3 18 6.6 4 78 46 76 64 28 20 16 13 10 9.6 10 9.6 19 6.5 5 20 6.3 6 2.9 2.6 2.5 2.4 2.5 2.2 1.9 2.2 3.1 2.4 21 6.0 7 22 5.7 8 23 28 9 24 5.1 10 25 5.0 11 26 4.9 12 27 4.6 13 28 4.5 14 29 4.4 15 30 4.2 31 4.2 Note. — Discharge estimated for days on which no gage heights were recorded, with the exception of period Nov. 23 to Dec. 3. 1913. Staff gage-height evidence indicated a maximum discharge of about 300 second-feet on night of Dec. 3. ISLAND Of OASU. 75 NUUANU STREAM AT LUAKAHA WEIR IN UPPER NUUANU VALLEY, NEAR HONOLULU, OAHU. Location. — About 1 mile above reservoir No. 4 (main) in upper Nuuanu Valley, and about 5 miles from Honolulu post office. Records available. , 1903, to December 31, 1913. Gage. — ^Head is measured on iron pipe set about 3.0 feet back from weir crest; read once daily. Control. — Permanent. Discharge measurements. — ^Made by 4-foot sharp-crested weir with end contrac- tions; check measurements made with current meter by wading. At times floods exceed the capacity of the diversion channel and are not measured. Waste water from this station is measured by station on the Nuuanu Stream below reservoir No. 4. Diversions. — ^Aqueduct diverts seepage from reservoir No. 4, including inflow from Nuuanu Valley drainage below reservoir No. 4. Cooperation. — Records furnished by waterworks department of city of Honolulu. Monthly discharge of Nuuanu Stream at Lvxihaha weir, in Nuuanu Valley, near Honolulu, Oahu, for 1913. Month. Discharge in second-feet. Maximum. Minimum Run-off (total in acre-feet). January February March April May June July August September October November December The year 11.8 4.71 9.18 9.53 15.0 15.2 5.14 4.85 4.16 2.19 19.8 20.2 20.2 2.76 2.41 1.47 2.41 2.41 3.63 2.88 2.64 1.47 .70 .56 6.04 .56 4.62 2.60 3.07 3.69 4.96 4.77 3.79 2.94 2.24 1.25 5.60 9.56 4.10 284 144 189 220 305 284 233 181 133 77 333 588 NUUANU STREAM BELOW RESERVOIR NO. LULU, OAHU. 2 WASTEWAT, NEAR HONO- Location. — On Pali road in upper Nuuanu Valley, about 5 miles from Honolulu post office and 1 mile above end of car line. Records available. — October 21 to December 31, 1913. Gage. — Inclined staff read to hundredths. Control.— Permanent. Discharge measurements. — Low-water discharge measured by 2.0-foot sharp- crested weir with end contractions. Flood discharge measured by 12.0-foot sharp-crested weir with end contractions, which, with small weir, gives total flood discharge. Both weirs set in concrete structure. Small weir crest is 1.0-foot below large weir crest in elevation. Diversions. — Irrigation ditch diverts low-water discharge at point 300 feet below gage. Station measures waste water and seepage from reservoirs Nos. 2, 3, and 4 and the Luakaha weir. 76 WATEK EESOUECES OF HAWAII, 1913. Daily discharge, in second-feet, of Nuuanu Stream below reservoir No. £ wasteway, near Honolulu, Oahu, for 1913. Day. Oct. Nov. Dec. Day. Oct. Nov. Dec. 1 0.21 .21 .21 .21 .21 .24 .27 1.08 1.95 1.77 5.05 5.41 6.34 4.38 3.12 14.9 45.6 56.4 44.2 30.4 48.3 36.5 22.3 18.9 13.2 12.1 10.6 9.64 14.5 12.5 16 3.34 1.89 1.83 2.90 27.1 24.4 17.1 10.3 12.1 29.3 12.1 49.4 24.4 17.1 14.1 11.4 2 17 10.6 3 18 10.6 4 19 10.6 5 20 10.6 6 21 0.30 .30 .30 .30 .27 .27 .24 .21 .21 .21 .21 9.97 7 22 9.01 8 23 V.85 9 24 •7.59 10 25 7.35 11 26 6.70 12 27 28 6.51 13 6.51 14 29 6.13 15 30 6.13 31 6.13 Note.— Mean for November, 9.27 second-feet; minimum for November, 0.21 second-feet. Mean for December, 16.9 second-feet; minimum for December, 6.13 second-feet. LULUMAHA^ DITCH AT UPPER NUUANU RESERVOIR, NEAR HONOLULU, OAHU. Location. — ^About 500 feet east of spillway of upper Nuuanu Valley reservoir, about 7 miles northeast of Honolulu post office. Records available. — September 2, 1911, to September 30, 1913. Gage. — ^Vertical staff. Control. — Shifting. Discharge measurements. — ^Made by wading. Diversions. — Low-water discharge is diverted from Lulumaha Stream into reservoir No. 4. Accuracy. — Records poor. Discharge measurements of Lulumaha ditch at upper Nuuanu reservoir, near Honolulu, Oahu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Apr. 2 14 G. K. Larrison Feet. 0.31 .34 Sec.-ft. 58 J. C. Dort 77 1 Incorrectly spelled "Lulumaho" in Water-Supply Paper 336. ISLAND OF OAHU. 77 Daily discharge, in second-feet, of Lulumaha ditch at upper Nuuanu reservoir, near Hono- lulu, Oahu,for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. 1 0.6 .5 .5 .5 .3 .3 .3 .9 1.2 2.9 8.0 1.7 1.6 1.0 1.2 1.9 1.4 1.2 1.0 .8 .8 .6 .6 .6 .5 .5 .5 .5 .5 .5 .5 0.5 .5 .5 .5 .3 2.5 1.4 1.4 .9 .6 .5 .5 .5 .5 1.4 .9 6.2 1.4 .9 .5 .5 .5 .5 2.5 .5 .5 .5 .5 0.5 .5 .5 .5 .5 .5 .5 .5 .5 .5 .5 .5 .5 18.5 .9 .6 .5 .5 .5 .5 1.2 1.2 5.1 1.6 1.0 1.0 .9 .5 .5 .5 3.8 1.4 .7 1.2 .7 .5 .5 .5 .5 .5 .5 .5 2.9 5.8 1.2 3.8 1.2 1.4 1.2 .9 .9 .9 .9 2.0 1.4 1.2 1.4 1.2 .9 0.9 1.9 1.9 1.2 1.2 .9 5.4 2.0 3.1 1.9 1.4 1.4 4.9 1.2 2.5 1.4 1.4 1.2 1.2 1.2 .1.2 1.2 .9 .9 .9 .9 1.2 1.2 1.4 1.2 1.2 1.2 .9 6.5 .9 .9 .9 .9 .9 1.4 3.8 1.4 1.2 1.2 .9 .9 .9 .9 .9 .9 5.4 1.2 1.2 1.2 .9 .9 .9 1.2 1.4 1.4 3.8 3.8 3.8 1.9 1.4 1.4 1.4 .9 .9 1.2 .9 .9 .9 .6 .6 .6 .5 .5 .5 .5 .5 .5 .5 .5 .5 .9 .9 .6 .6 .9 .5 .5 0.5 .5 .5 .5 .5 .5 .5 .5 .5 .9 .9 1.9 1.4 1.4 1.9 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.9 6.5 1.4 1.4 1.4 1.9 2 3 8 3 1.4 4 1 4 5 1.4 6.. 1.4 7 .9 8 .9 9 .9 10 9 n .9 12 .9 13 .9 14 1.4 .9 .6 17 5 .5 19 1.4 .5 .5 22 .5 23 5 24 5 .5 .5 27 .5 .5 29 .5 .5 31 Monthly discharge of Lulumaha ditch at upper Nuuxinu reservoir, near Honolulu, Oahu, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. January February. . March April May Jime July August September. 8.0 6.2 18.5 5.8 5.4 6.5 3.8 6.5 3.8 0.3 .3 .5 .5 .9 .9 .5 .5 .5 1.09 1.01 1.48 1.10 1.63 1.57 .99 1.32 .95 The period. 67.0 56.1 91.0 65.5 100 93.4 60.9 81.2 56.5 672 78 WATER RESOURCES OF HAWAII, 1913. PAUOA STREAM AT UPPER PAUOA VALLEY, NEAR HONOLULU, OAHU. Location. — In upper Pauoa Valley, 1,000 feet below Kahuawai Spring, about 1 mQe above Punchbowl, and about 2.5 miles northeast of Honolulu post office. Records available. — ^April 14, 1911, to December 31, 1913. Gage. — ^Watson weekly water-stage recorder October 17, 1911, to December 31, 1913; staff gage, graduated to tenths and read to hundredths, April 14 to October 16, 1911. Control. — Permanent. , Discharge measurements. — April 14 to October 16, 1911, current-meter measure, ments made by wading; October 17, 1911, to December 31, 1913, by 4-foot sharp- crested weir that has been checked with current-meter measurements. Diversions. — Several small ditches and one pipe line divert part of low-water discharge. Regulation. — Stream is fed by several perennial springs within 2 miles above station. Discharge measurements of Pauoa Stream at upper Pauoa Valley, near Honolulu, Oahu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Mar 4 G K Larrison Feet. 0.16 .15 .11 Sec.-n. 91 Sept. 11 Oct. 2 G.R.White 54 J. C. Dort .48 Daily discharge, in second-feet, of Pauoa Stream at upper Pauoa Valley, near Honolulu, Oahu, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 2.19 2.19 2.08 1.97 1.97 1.97 1.87 1.87 4.85 3.37 5.43 2.53 4.43 3.50 3.00 2.64 2.30 2.08 1.97 1.87 1.77 1.77 1.66 1.66 1.66 1.66 1.57 1.57 1.57 1.57 1.47 1.47 1.37 1.37 1.28 1.28 1.28 1.37 1.37 1.37 1.37 1.37 1.37 1.37 1.37 1.28 1.19 1.10 1.10 1.10 1.10 1.02 1.02 1.02 .93 1.02 1.02 1.02 1.02 0.93 1.02 .93 .85 .85 .85 .77 .77 .77 .77 .70 .62 .62 2.30 1.02 .85 .93 .85 .77 .77 .93 1.19 1.10 1.02 .93 .85 .93 .93 1.02 .93 3.63 2.41 1.77 1.97 2.08 1.10 1.10 1.02 1.02 .93 .85 .85 3.24 14.1 3.50 2.41 1.77 3.89 3.76 2.76 2.19 1.66 1.47 2.19 3.63 8.48 2.41 1.87 3.63 4.29 2.19 8.31 3.50 2.41 5.29 7.64 4.57 3.00 3.24 3.63 3.00 2.53 2.19 2.08 2.30 2.19 7.47 5.43 2.76 2.19 1.97 2.08 2.19 2.08 1.87 1.77 1.97 1.97 1.97 1.97 1.97 1.87 1.77 1.77 1.66 5.14 5.58 2.64 2.53 2.30 2.08 3.24 4.16 3.37 2.41 2.19 1.97 1.97 1.77 1.77 1.77 4.16 2.19 1.77 1.57 1.57 1.47 1.47 1.47 3.37 1.97 2.64 4.16 6.56 3.50 2.41 3.12 1.97 1.57 1.57 1.77 1.57 1.57 1.47 1.47 1.37 1.37 1.37 1.37 1.37 1.37 1.37 1.37 1.19 1.37 1.77 1.37 1.19 1.02 1.37 1.28 1.28 .70 0.70 .70 .62 .85 1.02 1.02 1.02 1.02 .93 .93 .85 .93 .93 .93 .85 .85 .77 .77 .77 .77 .77 .85 .85 .77 .77 .85 .85 .85 .86 .87 .88 0.89 .90 .91 .92 .93 .93 .85 .85 .77 .77 .77 .77 .77 .85 .85 .77 .77 .85 1.10 .77 .77 .70 .70 .70 .70 .62 .62 .55 .62 .62 0.55 .55 .55 .55 .55 .55 .55 .55 .55 .55 .55 .62 .70 .62 .55 ..55 .55 .55 .55 .55 .55 ,55 .55 .55 .55 .55 .55 .55 .55 .55 .55 0.55 .55 .55 .55 .55 .94 1.32 1.70 2.09 2.48 2.86 3.24 3.63 2.08 1.47 1.19 1.02 2.08 3.24 6.82 3.76 1.97 1.66 3.76 16.2 12.9 5.58 3.37 2.76 3.24 2.88 2 2.76 3 12.5 4 8.14 5 6.66 6 6.98 7 6.19 g 5.29 9 6.29 10 5.14 11 4.57 12 4.29 13 4.29 14 4.29 15 4.29 16 4.16 17 4.16 18 3.76 19 3.76 20 3.76 21 3.63 22 3.63 23 3.54 24 3.46 25 3.37 26 3.24 27 3.00 28 2.88 29 2.88 30 2.76 31 2.64 ISLAND OF OAHU, 79 Monthly discharge of Pauoa Stream at upper Pauoa Valley, near Honolulu, Oahu, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 5.43 1.47 3.63 14.1 8.31 5.58 6.56 1.02 1.1 .7 16.2 12.0 16.2 1.47 .93 .62 .85 1.77 1.47 .7 .62 .55 .55 .55 2.64 .55 2.32 1.21 1.01 2. 82 3.14 2.44 1.81 .85 .79 .56 3.14 4.46 2.05 143 67.2 62 168 193 146 111 52.3 47 34.4 187 274 1,480 KAHUAWAI SPRING AT UPPER PAUOA VALLEY, NEAR HONOLULU, OAHU. Location. — In upper Pauoa Valley, one-fourth mile above Pauoa Stream weir station, about 1\ miles above Punchbowl, and about 2f miles northeast of Honolulu post office. Records available. — September 23, 1912, to December 31, 1913. Gage. — A 2 by 2 inch stake driven into pool of spring, with nail in top, 6 feet above weir, to measure head on weir. Head is read twice daily to hundredths. Control. — Spring boils up vertically in pool about 10 feet in diameter. Weir is built between rock abutments on south side of pool about 10 feet from center. Discharge. — Computed by Francis formula for sharp-crested weirs with end con- tractions. Weir has 1.5-foot crest length. Monthly discharge of Kahuawai Spring at upper Pauoa Valley, near Honolulu, Oahu, for 1913. . Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-ofE (total in acre-feet). Accu- racy, January February March April May June July August September October November December The year 0.54 .50 .50 .50 .54 .54 .54 .50 .50 .50 .54 .54 0.50 .47 .47 .50 .50 .50 .50 .50 .50 .50 .50 .54 0.50 .50 .48 .50 .51 .62 .50 .50 .50 .50 .53 .54 .54 .47 30.7 27.8 29.5 29.8 31.4 30.9 30.7 30.7 29.8 30.7 31.5 33.2 367 80 WATER RESOUECES OP HAWAII, 1913. MANOA STREAM AT UPPER MANOA VALLEY, NEAR HONOLULU, OAHU. Location. — Below confluence of two main branches in upper Manoa Valley, about 5 miles east of Honolulu post office. Records available.— October 6, 1910, to July 5, 1913. Gage. — Vertical staff. C ontrol. — Shifting . Discharge measurements. — ^Made by wading for low and medium stages up to a gage height of about 4.0 feet; above this stage from footbridge at gage. Diversions. — Several small irrigation ditches divert a part of the low-water discharge from the branches of the stream above the station. Most of this water returns to the stream by seepage and drains above the station. Accuracy. — Records poor. Discharge measurements of Manoa Stream, at upper Manoa Valley, near Honolulu, Odhu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Feb. 28 G. K. Larrison Feet. 2.93 3.36 Sec. ft. 1.08 6.06 Apr. 14 J. C. Dort Feet. 3.70 Sec. ft. 18.5 Mar. 21 J. C. Dort Monthly discharge of Manoa Stream at upper Manoa Valley, near Honolulu, Oahu, for 1913. Month. Discharge in second-feet. Run-ofl (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. 5.1 12.2 15 33 39 38 13 1.2 1.1 1.1 2.5 7.9 7.2 10 2.43 2.70 3.40 11.5 13.6 12.2 11.6 149 150 209 684 836 726 115 D. February D. March D. April D. Mav D. D. July 1-5 D. The period 2,870 Note. — Two stations were established on the east and west branches of Manoa Stream May 29, 1913. These stations are above all diversions and are intended to supplant the old station, which was discon- tinued July 5, 1913. MANOA STREAM AT COLLEGE OF HAWAII, NEAR HONOLULU, OAHU. Location. — In gorge about one-half mile southeast of College of Hawaii, and 3 miles east of Honolulu post office. Records available. — Daily discharge from March 23, 1909, to November 24, 1910; November 1, 1912, to April 26, 1913; September 10 to December 31, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measureraents. — ^Made by wading. Diversions.— Several irrigation ditches above station. Accuracy. — Records poor. Cooperation- — ^Maintained in cooperation with the College of Hawaii. ISLAND OF OAHU. 81 Discharge measurements of Manoa Stream at College of Hawaii, near Honolulu, Oahu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Feb 28 G. K. Larrison Feet. 0.95 2.09 Sec. ft. 0.99 26.0 Apr. 14 17 J. C. Dort . . Feet. 2.40 2.64 Sec. ft. 39 4 Mar. 21 J. C. Dort Dort and White 56 7 Daily discharge, in second-feet, of Manoa Stream, at College of Hawaii, near Honolulu, Oahu, for 1912-13. Day. Nov. Dec. Day. Nov. Dec. Day. Nov. Dee. 1912. 1 2.6 2.0 3.0 1.1 3.9 2.0 7.0 3.0 29 3.8 35 38 169 29 22 19 17 11 7.0 7.0 11 12 13 14 15 16 17 18 19 20 1912. 4.8 5.5 2.0 1.2 6.2 2.5 2.0 2.2 2.3 2.0 4.0 2.0 3.5 3.5 2.0 1.8 1.5 1.8 31 6.7 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 1912. 33 35 38 18 11 7.0 7.0 62 33 14 20 2 106 3 33 4 155 5 20 6 45 7 29 7 20 9 7 10 7.0 7.0 Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1913. 1 7.0 7.0 3.2 2.0 2.0 2.0 2.0 2.0 4.0 7.0 10 6.0 14 18 12 6.4 4.6 3.6 3.4 2.8 6.1 4.8 4.9 4.3 3.0 2.6 2.0 2.0 1.9 .9 2.0 0.9 1.2 1.4 1.3 1.0 1.9 6.7 6.1 2.6 1.8 1.6 1.2 1.0 .9 .9 .9 1.0 9.0 11 3.2 1.2 1.0 1.8 2.7 3.2 2.4 1.6 1.0 1.0 .9 .9 1.2 1.4 1.2 1.2 1.1 1.2 1.3 " 1.2 1.2 1.2 6.4 8.0 6.4 3.4 2.6 1.8 4.4 3.6 10 4.6 3.4 3.1 3.3 2.2 2.8 3.7 15 11 5.8 6.4 4.3 3.1 2.4 1.9 1.9 2.6 2.5 20 13 21 57 37 48 64 33 24 24 19 13 9.8 18 8.4 67 18 0.5 .5 .5 .5 .5 .5 .5 .5 .5 .5 . 5 .4 .4 .7 .6 .6 .6 .5 .5 .5 .5 .5 .5 .5 .5 .5 .5 .6 .6 .6 0.6 1.5 2.5 1.0 .8 .9 1.0 15 31 32 36 31 27 12 9.4 3.8 4.6 6.7 23 61 31 9.8 9.4 32 75 141 50 27 18 17 11 2 8 3 44 4 102 5 41 6 44 7 65 8 28 9 18 10 0.6 .5 .5 .6 1.2 1.0 . 7 4.9 1.1 .8 .8 .8 .0 .c .5 .5 .5 12 11 9 4 12 7 8 7 14 8 15 6 4 16 4 8 17 4 6 5 8 19 3 9 20 3 1 3 1 22 : 2 8 1 9 24 1 4 25 1 26 .9 27 g 9 29 g 30 8 31 7 Note.— No record Apr. 27 to Sept. 9, 1913. 97764°— wsp 373—15 6 82 WATER RESOUECES OF HAWAII^ 1913. Monthly discharge of Manoa Stream at College of Hawaii, near Honolulu, Oahu, for 1912-13. November. December. January February March April 1-26 September 10-30. October November December The period . Month. 1912. Discharge in second-feet. Maximum. Minimum. Mean 62 169 18 11 15 67 4.9 .7 141 102 1.1 1.5 0.9 .9 .9 1.9 .5 .4 .6 .7 11.5 27.8 4.95 2.52 3.57 2.02 .90 .52 23.7 14.5 Run-off (total in acre-feet). 684 1,710 304 140 220 1,040 38 32 1,410 4,080 Accu- racy. EAST BRANCH OF MANOA STREAM AT UPPER MANOA VALLEY, NEAR HONOLULU, OAHU. Location. — About 4 miles northeast of Honolulu post office, in upper Manoa Valley, about 200 feet above highway bridge, and 600 feet above confluence of two branches. Records available. — May 29 to December 31, 1913. Gage. — Vertical staff. Control. — Somewhat shifting at high water. Diversions. — One irrigation ditch diverts water above station. Discharge measurements. — For low and medium stages, made by wading just below highway bridge; for floods, from bridge. Accuracy. — Records good. Discharge measurements of East Branch of Manoa Stream at upper Manoa Valley, near Honolulu, Oahu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. June 23 G. K. Larrison Feet. 2.19 2.07 2.54 Sec.-ft. 2.41 1.63 4.91 Nov. 12 Dec. 4 J. C. Dort Feet. 2.84 3.38 Sec. -ft. 10.2 Sept. 11 Nov. 10 ....do G. R. White 24.0 J. C. Dort ISLAND OF OAHTJ. 83 Daily discharge, in second-feet, of East Branch of Manoa Stream at upper Manoa Valley, near Honolulu, Oahu,for 1913. Day. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 1.9 1.9 19 3.2 2.6 2.7 2.6 2.6 3.3 3.7 3.0 2.3 2.1 2.0 2.0 2.0 2.0 2.0 2.3 88 2.2 2.1 2.0 2.0 2.1 2.1 2.1 2.0 2.0 2.1 2.1 2.1 2.1 2.1 2.1 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.2 2.3 2.0 1.9 1.9 1.9 1.8 1.8 1.8 1.8 1.8 1.8 1.9 2.0 1.8 2.0 1.8 1.8 1.8 1.8 1.8 1.7 1.7 1.7 1.8 1.8 1.7 1.7 2.2 1.8 5.6 2.0 1.9 1.8 1.8 2.2 1.9 1.8 1.8 1.9 1.9 2.0 2.0 2.0 2.0 1.9 2.2 2.0 2.0 3.6 1.7 2.0 1.8 1.7 1.7 5.4 1.7 1.7 1.6 1.6 1.6 1.7 1.9 1.7 1.6 1.6 1.5 1.7 2.1 1.6 1.8 1.7 1.6 1.6 1.6 1.5 1.5 1.7 1.6 1.6 1.6 1.5 1.5 1.5 1.6 1.6 1.7 2.1 1.6 1.6 1.5 1.5 1.9 1.8 1.6 2.0 1.6 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.6 1.6 1.5 1.6 1.5 1.5 1.8 1.6 1.5 1.6 1.6 15 7.8 7.4 3.8 4.3 7.4 6.6 4.5 3.2 2.4 2.4 4.8 8.3 45 8.8 5.6 4.4 4.3 14 17 15 8.3 6.1 5.8 3.0 2 4.5 3 20 4 23 5 14 6 14 7 18 8 5.2 9 7.4 10 5.8 11 5.7 12 5.3 13 5.2 14 4.8 15 4.6 16 4.2 17 3.8 18 3.6 19 3.0 20 3.4 21 3.3 22 3.0 23 2.8 2.8 25 2.8 2.8 27 2.8 28 2.8 29 2.2 2.0 1.9 2.8 30 2.8 31 2.8 Note. — Discharge July 1-10 estimated by comparison witli other stream run-off in yicinity. Monthly discharge of East Branch of Manoa Stream at upper Manoa Valley, near Hono- lulu, Oahu, for 1913. May 29-31. . June , July August September. October November. . December. . Month. The period . Discharge in second-feet. Maximum. Minimum. Mean 2.2 88 2.3 5.6 5.4 2.1 45 23 1.9 1.9 1.8 1.7 1.5 1.5 1.5 2.8 2.03 5.72 1.95 2.06 1.80 1.60 7.39 6.13 Run-off (total in acre-feet) . 12. 340 120 127 107 98. 440 377 1,620 Accu- racy. 84 WATER EESOUECES OF HAWAII, 1913. WEST BRANCH OF MANOA STREAM AT UPPER MANOA VALLEY, NEAR HONOLULU, OAHU. Location. — ^About 150 feet above highway bridge in upper Manoa Valley, and 4 miles northeast of Honolulu post office. Records available. — ^May 29 to December 31, 1913. Gage. — Vertical staff. Control. — Somewhat shifting. Discharge measurements. — At low and medium stages made by wading; flood measurements made from footbridge. Diversions. — None above station. Accuracy. — Records good. Discharge measurements of West Branch of Manoa Stream, at upper Manoa Valley, near Honolulu, Oahu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. June 23 G. K. Larrison Feet. 1.84 1.53 Sec.-ft. 2.44 .68 Nov. 10 Nov. 12 J. C. Dort Feet. 2.62 2.95 Sec.-ft. 10.1 Sept. 11 do .. ..do 19.2 Daily discharge, in secondfeet, of West Branch of Manoa Stream,, at upper Manoa Valley, near Honolulu, Oahu, for 1913. Day. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 1.4 1.2 14 3.4 2.4 2.6 1.8 1.3 4.4 5.4 4.0 3.1 6.4 16 16 2.3 2.1 2.2 3.5 68 3.4 2.6 2.1 1.9 1.9 1.9 1.9 2.6 1.7 1.8 1.9 2.0 2.0 2.1 2.1 2.2 2.2 2.3 2.3 2.4 2.5 2.4 2.3 1.8 2.0 1.9 1.3 1.6 1.4 1.6 1.7 1.4 1.8 2.7 1.7 1.5 2.0 1.7 2.0 1.9 1.8 1.3 1.4 1.5 1.4 1.8 1.3 1.5 1.1 1.2 3.5 1.3 8.0 2.0 1.6 1.2 1.2 2.5 . 1.4 1.1 1.2 1.0 .9 .9 .9 .9 .7 .7 1.2 1.7 1.1 3.5 4.0 2.6 1.4 1.2 1.3 1.0 .8 .7 .6 .6 .6 .7 1.6 1.6 .8 .7 .6 1.1 3.4 1.6 1.2 .9 .9 .9 .8 .7 .6 .5 .8 .6 0.6 .2 .5 .5 .6 .6 .7 3.5 .8 .6 .5 .5 .8 .4 .7 2.2 .6 .5 .5 .5 .4 .4 .4 .4 .4 .4 .7 1.4 .6 .4 .4 0.4 .8 1.0 .7 .6 .6 6.0 8.2 13 9.2 12 15 10 5.8 4.7 4.1 4.3 5.4 10 22 9.7 6.4 4.3 9.4 8.5 23 17.0 9.2 7.3 5.6 4.7 2 4.5 3 14 4 18 5 10 6 11 7 8.2 8 6.8 9 4.6 10 4.6 11 4.3 12 8.6 13 4.1 14 3.5 15 1.3 16 .1 17 1.4 18 .1 19 .8 20 3.8 21 4.0 22 1.8 23 3.0 24 2.6 25 2.5 26 2.4 27 2.3 28 2.1 29 1.6 1.6 4.6 2.0 30 2 31 1.9 Note. — Discharge estimated July 1-10. ISLAND OF OAHU. 85 Monthly discharge of West Branch of Manoa Stream at upper Manoa Valley, near Hono- lulu, Oahu, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. May 29-31. June , July , August September. October November.. December.. The period. 4.6 68 2.7 8.0 4.0 3.5 23 18 1.6 1.2 1.3 .7 .5 .2 .4 .1 2.60 6.11 1.95 1.65 1.16 .70 7.81 4.55 15.5 364 120 101 69 43 465 280 1,460 WAIOMAO STREAM AT UPPER PALOLO VALLEY, NEAR HONOLULU, OAHU. Location. — ^About 3 miles above Pukele in Palolo Valley, and about 9 milea from Honolulu post office, at an elevation of 900 feet. Records avaHable.— October 10, 1911, to July 12, 1913. Gage. — ^Watson water-stage recorder above 3-foot sharp-crested weir; datum un- certain on account of leaks under weir. Control. — Shifting. Discharge raeasurements. — Made by wading. Diversions. — New pipe line diverted all low-water discharge for Honolulu water supply after July 12, 1913. Accuracy. — Kecords fair. Regulation. — Stream drains Kaau Crater and is regulated by springs. Discharge ineasurements of Waiomao Stream at upper Palolo Valley, near Honolulu, Oahu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Feb. 26 G. K. Larrison Feet. 0.12 .08 Sec.-ft. 0.49 Apr. 8 do .29 86 WATEE EESOUECES OF HAWAII^ 1913. Daily discharge, in second-feet, of Waiomao Stream at upper Palolo Valley, near Honolulu, Oahu, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. 1 0.37 .27 .27 .27 .62 .32 .27 .23 .27 .37 .89 .58 .70 .58 .64 .70 .42 .47 .47 .42 .37 .37 .32 .27 .23 .19 .23 .19 .19 .19 .27 0.19 .19 .19 .42 4.08 1.64 1.48 1.72 .82 .58 .47 .37 .32 .27 1.89 2.52 2.16 3.02 2.25 1.32 .89 .70 .64 .89 .64 .58 .52 .42 0.37 .37 .37 .32 .32 .32 .52 .47 .37 .32 .32 .27 .27 3.32 2.07 1.17 .89 .64 .52 .47 1.64 1.89 1.32 1.98 1.72 1.17 1.10 .76 .64 1.10 .89 0.96 .70 .70 .58 .47 .37 .32 .32 .32 .32 .76 1.24 4.08 2.52 1.80 3.22 3.22 1.89 1.40 1.10 .82 .82 1.10 1.03 5.48 1.80 1.10 .96 .82 .64 0.58 1.10 1.17 .82 .64 .47 1.10 3.64 1.64 1.24 1.03 4.88 3.75 2.34 2.16 1.72 1.56 1.17 1.03 .76 .64 .58 .53 .48 .42 .37 .52 .37 .37 .37 .32 0.32 .37 4.30 3.02 1.56 1.32 .89 .76 .70 .64 .52 .82 1.03 .76 1.64 2.82 2.16 1.24 1.03 1.64 1.03 .76 .64 .52 .47 .47 1.64 3.12 1.48 1.48 1.24 2 1.56 3 1.17 4 .89 5 .89 6 .64 7 .70 8 .52 9 .52 10 . .42 11 .42 12 .. .52 13 14 . 17 19 20 22 .. 23 24 27 28 . 29 31 Note. — Discharge May 22-24 estimated. Monthly discharge of Waiomao Stream at upper Palolo Valley, near Honolulu, Oahu, for 1913. Month. Discharge in second-feet. Maximum. Minimum, Run-off (total in acre-feet). Accu- racy. January . . February. March April May June July 1-12. 0.89 4.08 3.32 5.48 4.88 4.30 1.56 0.19 .19 .27 .32 .32 .32 .42 0.38 1.11 .90 1.36 1.22 1.30 .79 23.4 61.6 55.3 80.9 75.0 77.4 18.8 The period . 390 WAIMANALO DITCH BELOW MAIN RESERVOIR ON THE WAIMANALO PLANTATION, NEAR WAIMANALO, OAHU. Location. — On main ditch immediately below main reservoir of the Waimanalo plantation, about 2 miles southwest of the plantation headquarters. Waimanalo is about 15 miles east of Honolulu. Records available. — November 1, 1912, to December 31, 1913. Gage. — Vertical staff, read twice daily to quarter-tenths. Control. — Probably permanent. Discharge measurements. — Made by wading. Diversions. — Ditch is outlet of the main reservoir on the Waimanalo plantation. Accuracy. — Records good . Cooperation.— Maintained in cooperation with the Waimanalo Plantation Co. ISLAND OF OAHIT. 87 Discharge vieasurements of Waimanalo ditch beloiv main reservoir on the Waimanalo 'plantation, near Waimanalo, Oahu, in 1913. Date. Hydrographer. Case height. Dis- charge. Apr 11 G. K. Larrison. . Feet. 1.18 1.42 Sec.-ft. 6.15 bept. 9 G. R. AVhite 7.53 Daihj discharge, in second-feet, cf Waimanalo ditch below main reservoir on the Waimanalo plantation, near Waiynanalo, Oahu, for 1912-13. Day. Nov. Dec. Day. Nov. Dec. Day. Nov. Dec. 1 1912. 6.9 6.7 6.9 7.1 7.2 6.9 6.9 6.6 7.2 7.4 7.4 7.4 7.4 7.4 7.4 7.4 7.4 7.4 7.4 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 1912. 7.5 7.3 7.0 7.0 7.3 6.9 7.1 7.3 7.3 6.9 21. 22. 24: 25. 26. 27 23 ! 29. 30. 31. 1912. 7.1 7.3 6.9 7.1 7.3 7.0 7.3 6.9 7.4 7.4 2 3 4 5 6 g lu Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1913. 1 - . 7.0 6.7 6.9 7.1 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.2 6.3 6.3 6.3 6.3 6.5 6.5 5.6 6.8 6.2 7.4 6.8 7.4 7.4 5.1 7.3 7.3 7.3 7.4 7.3 7.3 6.7 6.7 7.3 ""7.'3' 7.5 7.4 6.9 6.9 7.1 6.9 7.2 7.5 7.4 7.8 7.5 7.5 7.3 7.6 7.8 7.5 7.5 7.4 7.4 7.3 7.4 7.5 7.5 7.4 7.3 7.3 6.9 6.9 6.9 6.9 6.9 6.9 7.3 6.9 7.2 7.4 7.4 6.9 6.8 6.8 6.8 7.1 7.4 7.4 7.4 7.4 7.4 6.8 7.1 7.4 7.1 7.1 7.1 7.1 6.8 7.1 7.4 7.4 7.1 7.1 6.9 6.8 7.0 7.3 7.3 6.8 6.8 6.8 6.8 7.0 7.3 7.3 6.8 6.8 6.8 6.8 7.0 7.3 7.3 6.8 6.8 6.8 6.8 7.0 7.3 7.3 6.8 6.8 6.8 6.8 7.0 7.3 7.1 6.8 6.8 6.8 6.8 7.1 7.4 7.1 6.8 6.8 6.8 6.8 7.1 7.4 7.1 6.8 6.8 6.8 6.8 7.1 7.4 7.1 6.8 6.8 6.8 6.8 7.1 7.4 7.4 6.8 6.8 6.8 ■6.8 7.1 7.4 7.4 6.8 6.8 6.8 6.8 7.1 7.4 7.1 6.8 6.8 6.8 6.8 7.1 7.4 7.4 7.1 6.8 6.8 6.8 7.1 7.4 7.4 7.4 7.4 7.4 7.4 7 4 2 7.4 3 6.8 6.8 6.8 6.8 6.8 6.7 6.8 6.8 6.8 6.8 6.8 6.8 7 4 4 7.4 5 6 7 8 9 . ; 10 11 12.... 13 14 15 16 5.6 5.6 6.8 6.8 6.8 6.8 6.8 6.8 6.8 6.5 6.2 6.2 6.2 6.2 6.2 6.2 "'6.'2' 6.2 6.7 6.9 7.4 6.3 7.3 7.4 6.9 6.9 7.4 7.3 6.8 6.8 6.2 6.2 6.2 6.5 6.1 6.9 6.9 6.7 6.9 7.1 7.1 6.2 7.3 17 18 19 20 21 ^ 22 23 24 25 26 27 28 29 30 31 Note.— Ditch dry Dec. 10-31, 1912; Jan. 5 to Mar. 2, May 12-19, June 3-8, 11-15, and Dec. 6-31, 1913. Discharge given is for period of about 10 hours daily. During remaining 14 hours ditch was dry. Dis- charge interpolated Sundays from July to December, as gage was not read. 88 WATER RESOURCES OF HAWAII, 1913- Monthly discharge of Waimanalo ditch below main reservoir on the Waimanalo -plantation, near Waimanalo, Oahu, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. January 1-4 Februs'ry March 3-14,16-31... April May 1-11,20-31 June 1,2,9,10,16-30. July August September October November December 1-4 7.1 6.7 6.92 6.8 7.4 7.4 7.3 7.8 7.4 7.3 7.4 7.4 7.4 5.6 5.6 5.1 6.1 6.9 6.8 6.8 6.8 6.8 7.4 6.57 6.27 6.97 6.76 7.28 7.13 6.99 6.96 7.09 7.40 152 155 132 106 187 183 173 178 The period . 1,760 Note. — Ditch dry during February. Water turned out of ditch Dec. 4. MAKAWAO DITCH AT MAKAWAO FLUME, NEAR WAIMANALO, OAHU. Location. — At west end of flume in Kailua Valley, 4 miles west of Waimanalo, and 11 miles by road from Honolulu; previous to November 24, 1913, at east end of flume. Records available. — November 1, 1912, to December 31, 1913. Gage. — Staff; new datum beginning November 24, 1913. Control. — Practically permanent. Discharge measurements. — November 1, 1912, to November 23, 1913, made by current-meter in open flume; November 24 to December 31, 1913, by 2.5-foot sharp-crested weir with end contractions. Diversions. — Ditch diverts all low water from headwaters of Kaimi and Makawao streams and discharges into the Waimanalo Reservoir. Accuracy. — Records poor. Cooperation.^ — Observer furnished by Waimanalo Plantation Co. Discharge measurements of Malcawao ditch at Mahawao flume, near Waimanalo, Oahu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Apr. 11 G. K. Larrison Feet. 0.59 .70 Sec.-ft. 3.03 1.96 Oct. 20 J. C. Dort Feet. 0.65 Sec. -ft. 1.79 Sept. 9 G.R.White Monthly discharge of Mahawao ditch at Mahawao flume, near Waimanalo, Oahu, for 1913. Discharge in second-feet. Maximum. Minimum. Mean. Run-oflE (total in acre-feet). Accu- racy. March 3-31 April , May June July August September October November December 1-3 , The period (276 days) 5.4 7.3 7.9 4.4 3.2 3.2 2.7 2.1 6.0 3.6 2.0 3.0 2.6 2.3 1.9 2.1 1.6 1.6 1.9 1.9 3.75 4.08 3.88 3.16 2.43 2.57 1.97 1.95 3.29 2.97 216 243 239 188 149 158 117 120 196 17.1 3.00 1,640 Note.— Ditch dry Jan. 1 to Mar. 2 and Dec. 4-31. ISLAND OF OAHU. 89 MAKAWAO STREAM IN KAILUA VALLEY, NEAR KAILUA, OAHU. Location. — One-fourth mile upstream from confluence of Makawao and Kaimi streams, and 100 feet above intake of irrigation ditch on Waimanalo-Honolulu road; about 12^ miles east by road from Honolulu. Records available. — November 12, 1912, to December 31, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made by wading and from footbridge. Diversions. — Low-water discharge of two main branches is diverted into Makawao ditch about three-fourths mile above station. An irrigation ditch diverts most of the low-water discharge at a point about 100 feet below the gage. Accuracy. — Records fair. Cooperation. — ^Maintained in cooperation with the Kaneohe Ranch Co. Discharge measurements of Makawao Stream in Kailua Valley, near Kailua, Oahu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Apr. 11 G. K. Larrison Feet. 0.94 1.37 Sec.-ft. 1.92 9.11 Sept. 9 Dec. 10 J. C. Dort Feet. 0.90 1.32 Sec. -ft. 1.81 do G. R. White 7.09 Daily discharge, in second-feet, of Makawao Stream in Kailua Valley, near Kailua, Oahu, for 1912-13. Day. Nov. Dec. Day. Nov. Dec. Day. Nov. Dec. 1.. 1912. 11 27 44 4.4 3.7 1.4 2.1 2.3 2.6 2.2 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 1912. 2.2 2.3 2.2 1.9 1.9 1.9 1.9 2.2 2.2 1.9 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 1912. 1.3 1.3 1.1 1.1 1.1 1.1 1.1 1.6 1.3 1.1 1.7 2.1 2 1.0 1.0 1.1 1.1 1.1 1.0 1.0 1.1 1.0 1.8 3 1.8 4 1.7 5 6 1.7 1.7 7 1.7 8 1.7 9 1.7 10. 1.7 90 WATER EESOUECES OF HAWAII^ 1913. Daily discharge, in second-feet, of Makawao Stream in KailuaValley , near Kailua, Oahu, for iSi^-^ 5— Continued. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1913. 1 2.2 2.2 2.1 1.9 3.1 11 6.8 4.1 3.2 2.5 1.6 1.4 .9 1.6 2.5 11 14 14 9.9 11 9.4 6.3 3.2 2.7 4.1 4.1 3.6 2.9 3.1 3.6 2.7 2.9 2.7 2.9 1.9 1.8 1.9 2.2 1.9 1.6 1.1 1.3 1.1 1.0 14 5.1 4.6 3.6 3.1 2.3 1.8 3.1 2.8 3.2 4.4 3.6 2.6 2.6 2.5 2.3 2.3 2.5 2.5 2.9 3.4 3.1 2.5 2.3 2.1 2.1 2.2 2.4 2.1 2.1 6.1 2.8 2.1 2.0 1.8 1.9 2.1 1.9 1.9 1.9 1.7 1.6 1.6 1.7 .8 1.9 2.5 1.9 1.9 1.7 1.7 2.1 2.1 2.9 3.6 2.0 48 12 IS 16 3.4 4.4 4.0 3.6 2.5 2.6 2.4 2.3 2.3 2.6 2.4 2.5 2.4 2.4 2.4 2.6 2.7 2.8 20 17 4.3 3.8 3.7 3.6 3.0 ' 3.1 3.0 2.9 3.1 3.1 3.1 3.2 2.8 2.6 2.7 3.1 2.9 2.5 2.3 2.4 2.4 2.5 2.4 2.5 2.6 2.4 2.5 3.4 2.5 2.5 2.3 2.1 2.3 2.3 2.3 2.3 2.3 2.1 2.1 2.5 2.5 2.2 2.4 2.3 2.3 2.1 1.9 1.9 1.9 1.9 1.9 1.9 1.9 2.1 2.1 1.9 1.9 2.1 1.9 2.1 1.9 1.7 1.7 1.9 2.1 2.1 1.9 1.9 4.1 2.9 2.1 1.9 1.9 2.3 2.5 2.2 2.1 2.1 1.9 2.1 2.1 2.1 2.1 2.0 2.0 1.9 2.0 2.1 2.3 3.4 2.1 2.1 1.7 1.8 1.7 1.6 1.6 1.6 1.6 1.6 1.7 1.7 1.7 1.6 1.6 1.6 1.6 1.6 1.6 1.7 1.9 1.7 1.7 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.7 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.5 1.7 1.8 1.7 1.6 1.6 1.7 1.6 1.4 1.4 1.6 1.6 1.6 1.6 1.6 1.4 1.4 1.7 1.3 1.6 1.6 1.5 1.6 1.5 1.4 1.6 1.6 1.6 1.7 2.3 2.3 2.3 1.9 1.7 2.1 4.8 1.9 1.7 1.6 1.9 2.5 2 . . .. 2.1 3 2.5 4 27 5 26 6 9.2 7 23 8 13 9 8.1 10 . . .. 6.5 11 5.4 12 4.8 13 4.4 14 . . .. 1.1 1.1 19 1.6 1.4 16 7.6 15 2.9 2.7 2.5 2.1 2.6 1.9 1.9 2.2 2.2 3.2 3.7 15 3.6 16 3.1 17 3.6 18 4.1 19 4.1 20 4.0 3.7 22 3.6 23 3.4 24 3.1 25 3.1 26 2.8 27 3.1 28 3.1 29 3.1 30 3.1 31 3.1 Note. — No record January 1-13. Monthly discharge of Makawao Stream in Kailua Valley, near Kailua, Oahu, for 1913. Month. January 14-31 ±i'ebruary March April May June July August September October November December The period . Discharge in second-feet. Maximum. Minimum. Mean 19 14 14 6.1 48 20 3.4 4.1 3.4 1.8 4.8 27 1.0 .8 1.7 2.3 1.9 1.9 1.6 1.4 1.3 2.1 4.83 5.14 3.00 2.29 5.16 3.95 2.21 2.12 1.76 1.60 1.80 6.32 Run-ofl (total in acre-feet). 172 285 184 136 317 235 136 130 105 98 107 389 2,290 Accu- racy. ISLAND OF OAHU. 91 KAIMI STEEAM IN KAILUA VALLEY, NEAR KAILUA, OAHU. Location. — At highway bridge on Waimanalo-Honolulu government road, about 12^ miles east of Honolulu. Records available. — November 12, 1912, to December 31, 1913. Gage. — Vertical staff, read twice daily. Datum raised 1.00 foot April 10, 1913; that is, 1.50 feet gage height previous to April 10 equals 0.50 foot gage heights after that date. Control. — Fairly permanent. Discharge measurements. — During low water, made by wading; during floods, from bridge. Diversions. — Headwaters diverted by Makawao ditch. Accuracy. — Records poor. Cooperation. — Maintained in cooperation with the Kaneohe Ranch Co. Discharge measurements of Kaimi Stream in Kailua Valley, near Kailua, Oahu, in 1913. Date. Hydrograpber. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Apr. 11 June 4 G. K. Larrison Feet. 0.75 1.08 Sec.-ft. 1.12 5.55 Sept. 9 J. C. Dort Feet. 0.82 Sec.-ft. I.(i7 do Daily discharge, in second-feet, of Kaimi Stream in Kailua Valley, near Kailua, Oahu, for 1912-13. Day. Nov. Dec. Day. Nov. Dec. Day. Nov. Dec. 1.. 1912. 18 1.7 21 4.3 4.0 1.9 2.4 2.5 2.5 2.6 11.. 12. 13. 14. 15. 16. 17. 18. 19. 20. 1912. 1.5 .8 .8 .8 2.4 2.5 2.6 2.5 3.4 2.5 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 1912. 1.5 1.6 1.3 1.1 1.2 1.1 1.6 2.8 2.6 1.9 2.6 2 1.0 1.0 1.0 1.8 1.0 1.0 1.0 1.1 1.0 2 5 3 2 4 4 2 6 5 2 6 6 2 6 7 2.6 8 2 9 2 10 2.0 2.4 92 WATER EESOURCES OP HAWAII, 1913. Daily discharge, in second-feet, of Kaimi Stream in Kailua Valley, near Kailua, Oahu, for 1912-13— Contmued. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1913. 1 2.0 2.0 1.7 1.7 3.2 10 8.4 3.4 2.4 1.5 .9 1.2 .7 1.4 2.6 12 7.0 5.0 3.8 3.8 5.0 3.8 3.5 2.6 5.0 4.8 3.8 3.2 2.9 2.8 2.4 2.4 2.8 2.4 1.9 1.6 1.4 2.4 2.4 1.7 1.6 1.4 .9 .8 14 5.0 3.8 2.8 2.2 1.4 .9 1.7 1.2 . 1.5 3.8 3.5 2.4 2.0 1.6 1.4 1.4 1.4 1.4 1.7 2.2 1.7 1.2 .9 1.0 1.2 1.7 3.8 1.2 1.2 4.8 1.3 1.1 .9 1.1 .9 .9 1.2 1.2 1.0 1.4 1.4 1.4 1.2 1.1 1.2 2.2 1.3 1.2 1.5 1.2 1.4 15 16 14 1.4 26 10 18 19 3.5 5.0 4.1 3.8 3.6 1.9 1.7 1.7 1.7 1.6 1.4 1.4 1.5 1.4 1.4 1.4 1.5 1.5 12 9.6 3.6 4.8 4.1 3.6 2.4 2.5 2.8 2.9 4.0 4.1 4.5 4.1 2.5 1.9 2.0 7.6 2.2 2.2 1.9 1.6 1.6 1.7 1.7 1.7 1.9 1.8 1.9 2.4 1.7 1.8 1.8 1.7 1.5 1.7 1.7 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.6 1.5 1.5 1.4 1.5 1.4 1.4 1.4 1.4 1.4 1.2 1.5 1.5 1.5 1.5 1.6 1.5 1.5 1.5 1.5 1.4 1.4 1.5 1.4 1.5 1.4 2.9 1.9 1.4 1.4 1.5 2.2 2.2 1.5 1.6 1.5 1.3 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 3.2 4.3 1.9 1.5 1.7 1.6 1.7 1.6 1.4 1.5 1.5 1.4 1.5 1.6 1.5 1.4 1.4 1.4 1.7 1.7 1.7 1.7 1.9 1.5 1.9 1.6 1.6 1.2 1.3 1.2 1.4 1.4 1.4 1.4 1.4 1.4 1.5 1.5 1.4 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.4 1.5 1.4 1-4 1.5 1.5 1.5 1.5 1.5 1.4 1.4 1.5 1.5 1.4 1.4 1.4 1.5 1.5 15 1.5 1.4 1.5 2.9 2.4 1.7 1.7 1.7 1.7 1.5 1.5 1.6 1.7 1.7 2.2 3.2 3.2 3.4 2.9 2.2 2.9 9.0 2.4 2.5 2.3 2.4 2 9 2 2 5 3 2 6 4 23 5 24 6 15 7 25 8 13 9 7 8 5.5 11 5 2 12 4.1 13 4 14 0.8 .8 10 1.2 1.2 10 2.6 2.6 2.6 2.1 2.6 2.4 3.4 2.9 2.6 2.8 2.6 3.4 3 6 15 3.5 16 3 2 17 4 3 18 5 2 5 2 20 5.2 21 5 2 22. . . .. 4 8 23 4 5 24 4.5 25. - . 4 3 26 4.1 27 4 28 4.1 29 3.8 30 4 4.1 Note.— No record Jan. 1-13, 1913. Monthly discharge of Kaimi Stream in Kailua Valley, near Kailua, Oahu, for 1913. Month. Discharge in second-feet. Run-off (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. January 14-31 10 12 14 4.8 26 12 2.4 2.9 4.3 1.5 9.0 25 0.8 .7 .8 .9 1.2 1.6 1.2 1.3 1.2 1.4 1.4 2.5 3.15 3.80 2.57 1.48 5.37 3.34 1.56 1.55 1.70 1.45 2.30 6.85 112 211 158 88.1 330 199 95.9 95.3 101 89.2 137 421 C. February C. March c. April c. May c. June c. July c. August c. September c. October c. November c. December c. The period 2,040 ISLAND OF OAHU. 93 KAMAKALEPO STKEAM IN KAILUA VALLEY, NEAR KAILUA, OAHU. Location. — ^At highway bridge on Waimanalo-Honolulu govemment road, and about 3 J miles from Waimanalo. Records available. — November 12 to December 3, 1912; April 9 to December 31, 1913. Gage. — Vertical staff bolted to left abutment of bridge, installed April 10, 1913, to replace original gage washed out December 3, 1912; new datum. Control. — Shifting. Discharge measurements. — Made by wading or from highway bridge. Diversions. — None above station. Accuracy. — Records good. Cooperation. — Station maintained in cooperation with Kaneohe Ranch Co. Discharge measurements of Kamahalefo Stream in Kailua Valley, near Kailua, Oahu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Apr. 11 G. K. Larrison Feet. 1.29 1.50 Sec.-ft. 1.33 4.91 Sept. 9 Dec. 10 J. C. Dort Feet. 1.30 1.60 Sec.-ft. 1.74 .do G.R.White 7.35 Daily discharge, in second-feet, of KamaJsalepo Stream in Kailua Valley, near Kailua, Oahu, for 1913. Day. Apr. May. June. July. Aug. Sept. Oct. Nov. Dee. 1 1.3 2.1 1.4 1.5 1.5 1.2 1.5 12 16 6.1 2.2 36 18 18 16 2.4 4.3 3.3 3.3 2.9 2.8 2.6 2.8 2.6 2.5 2.2 1.9 2.0 2.0 2.0 1.9 1.7 1.9 17 19 2.4 2.6 2.8 2.5 3.1 3.3 3.1 3.1 3.1 2.9 2.9 3.3 2.9 2.8 2.9 9.5 3.1 2.6 2.5 2.6 2.4 2.5 2.4 2.4 2.5 2.4 2.4 3.9 2.4 1.9 1.7 1.7 1.6 1.6 1.9 1.6 1.5 1.6 1.6 1.9 2.1 1.7 1.7 1.9 2.1 1.6 1.6 1.5 1.4 1.3 1.4 1.4 1.4 1.5 1.5 1.5 1.6 2.1 2.0 1.9 1.9 1.9 1.6 1.9 1.6 1.4 1.5 1.6 2.4 1.9 1.3 1.4 1.6 2.2 2.4 1.6 1.6 1.6 1.5 1.5 1.6 1.4 1.6 1.6 1.4 1.6 1.4 1.4 2.6 6.3 2.2 1.6 1.6 1.6 1.4 1.6 1.5 1.5 1.4 1.4 1.4 1.6 1.6 1.4 1.3 1.2 1.6 1.6 1.4 1.5 1.7 1.3 1.6 1.5 1.4 1.0 1.1 1.1 0.9 .8 .7 .7 .7 .7 .8 .7 .6 .8 .9 .7 .7 .6 .6 .6 .6 .6 .6 .6 .6 .6 .7 .8 .9 .6 .6 .6 .6 .6 .6 0.5 .6 .5 .5 .5 .5 .5 1.4 1.1 .6 .7 .7 .7 .7 .8 .9 .9 1.2 1.2 2.0 1.2 1.2 1.2 1.6 4.1 8.9 4.5 3.7 2.4 3.3 3 7 2 3.1 3 4 3 4 12 5 13 6 19 7 26 8 13 9 1.6 1.4 1.5 2.1 4.5 1.5 1.7 2.2 2.1 2.0 1.6 1.7 1.4 1.4 1.7 1.6 1.7 1.5 1.5 1.5 1.5 1.4 7.8 10 5.4 11 3.3 12 2.8 13 2.4 14 1.9 15 1.3 16 1 2 17 2.1 18 2.9 19 2.6 20 2.4 21 2.4 22 2.2 23 2.1 24 2.1 25 1.9 26 1.6 27 1.6 28 1.6 29 1.5 30 1.5 31 1.6 94 WATEK EESOUECES OF HAWAII, 1913. Monthly discharge of Kamahalepo Stream in Kailua Valley, near Kailua, Oahu,for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. April 9-30. June July August September. October November. December.. The period . 4.5 36 19 3.9 2.4 6.3 .9 8.9 26 1.4 1.2 1.7 1.3 1.3 1.0 .6 .5 1.2 1.78 5.69 3.94 1.76 1.69 1.67 .68 1.62 4.85 77.6 350 234 108 104 99.4 41.8 96.4 298 1,410 POHAKEA STREAM IN KAILUA VALLEY, NEAR KAILUA, OAHU. Location. — One-half mile above highway bridge on the Waimanalo road. Records available. — November 12, 1912, to December 31, 1913. Gage. — Vertical staff, read twice daily; datum changed November 24, when 1-foot sharp-crested weir was established. Gage heights from November 25 to Decem- ber 31 show head on crest of weir. Control. — Fairly permanent. Discharge measurements. — ^Made by wading with current-meter until November 24, after which low-water discharge was measured by sharp-crested weir (1-foot crest) with end contractions. Diversions. — None above station; two small ditches below. Accuracy. — Records poor. Cooperation. — ^Maintained in cooperation with the Kaneohe Ranch Co. Discharge measurements ofPohakea Stream in Kailua Valley, near Kaihm, Oahu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrograplier. Gage height. Dis- charge. Apr. 11 G. K. Larrison Feet. 1.20 1.68 Sec.-ft. 0.24 1.50 Sept. 9 J. C. Dort Feet. 1.16 Sec.-ft. 0.22 June 4 do Daily discharge, in second-feet, of Pohakea Stream in Kailua Valley, near Kailua, Oahu, for 1912-13. Day. Nov. Dec. Day. Nov. Dec. Day. Nov. Dec. 1.. 1912. 1.34 .24 1.51 .90 .82 .49 .49 .42 .37 .34 11. 12. 13. 14. 15. 16. 17.. 18.. 19.. 20. 1912. 0.33 .28 .33 .28 .25 .25 .25 .24 .24 .23 21.. 22.. 23. 24.. 25.. 26.. 27.. 28.. 29.. 30.. 31.. 1012. 0.19 .17 .14 .11 .11 .10 .10 .11 .23 .13 0.25 2 0.08 .08 .06 .12 .08 .08 .06 .07 .07 .24 3 .23 4 .23 5 .23 6 .23 7 .20 8 .20 9 .20 10 .20 .20 ISLAND OF OAHU. 95 Daily discharge, in second-feet, of Pohahea Stream in Kailua Valley, near Kailua, Oahu, for 1912-13— Continued. Day. Jan. Feb. Mar. Apr. May. Jiine. July. Aug. Sept. Oct. Nov. Dec. 1913. 1 0.13 .13 .12 .11 .15 .90 .98 .44 .29 .22 .15 .17 .15 .16 .17 1.20 1.72 1.54 1.30 1.04 .90 .76 .49 .35 .52 .35 .33 .29 0.24 .25 .24 .25 .23 .20 .15 .14 .16 .19 .17 .15 .11 .11 .11 .11 1.54 .71 .49 .38 .35 .28 .24 .38 .33 .44 1.54 1.40 .87 .54 .34 0.29 .33 .34 .33 .38 .45 .38 .33 .28 .28 .22 .25 .42 .22 .23 .30 .20 .23 .22 .23 .23 .22 .22 .22 .24 .22 .22 .22 .22 .20 0.20 .23 .22 .20 .20 .20 .19 .23 2.02 1.44 .35 1.72 1.07 .98 1.11 .45 .59 .45 .38 .40 .34 .28 .28 .25 .25 .23 .23 .23 .23 .23 .29 0.28 .29 1.72 2.02 .74 .31 .52 .42 .35 .40 .42 .42 .42 .42 .42 .37 .35 .31 .33 .50 .38 .31 .30 .31 .33 .30 .27 .27 .28 .28 0.28 .29 .23 .23 .23 .22 .23 .23 .23 .22 .22 .20 .20 .22 .22 .20 .20 .20 .20 .19 .20 .19 .20 .17 .19 .19 .20 .21 .19 .19 .19 0.20 .19 .17 .20 .20 .18 .18 .19 .19 .19 .17 .28 .19 .18 .17 .22 .23 .25 .19 .19 .21 .17 .19 .17 .17 .17 .20 .20 .20 .20 .20 0.28 .45 .20 .19 .20 .20 .22 .22 .20 .20 .19 .19 .19 .20 .20 .19 . .18 .19 .22 .22 .22 .21 .22 .20 .19 .19 .19 .19 .19 .17 0.19 .17 .17 .17 .17 .17 .17 .17 .17 .17 .17 .17 .17 .16 .15 .15 .15 .15 .14 .14 .15 .15 .16 .17 .16 .15 .15 .16 .17 .16 .15 0.15 .15 .15 .14 .12 .12 .15 .25 .22 .16 .15 .15 .15 .14 .14 .14 .14 .15 .19 .28 .23 .28 .23 .22 .47 .66 .49 .39 .30 .37 44 2 .39 3 72 4 .66 5 .72 6 .66 7 .66 8 .84 9 91 10 1 11 11 1 04 12 .94 13 91 14 0.16 .16 .64 .22 .20 .22 .22 .23 .25 .20 .20 .17 .20 .15 .11 .13 .12 .20 .78 15 63 16 57 17 .49 18 .44 19 44 20 .44 21 .39 22 39 23 .39 24 .34 25 .30 26 .32 27 .30 28 .30 29 .30 30 .28 31 25 Note. — No record Jan. 1-13, 1913. Monthly discharge of Pohakea Stream in Kailua Valley, near Kailua, Oahu, for 1913. Discharge in second-feet. Maximum. Minimum. Mean, Run-off (total in acre-feet). Accu- racy. January 14-31. February March April June July August September. October . . . November. December . 0.64 1.72 1.54 .45 2.02 2.02 .29 .28 .45 .19 .66 1.11 The period . 0.11 .11 .11 .20 .19 .27 .19 .17 .17 .14 .12 .25 0.21 .54 .41 .27 .50 .47 .21 .19 .21 .16 .23 .56 7.49 30.0 25.2 16.1 30.7 28.0 12.9 11.7 12.5 9.84 13.7 34.4 233 96 WATER RESOUECES OF HAWAII, 1913. SOUTH BRANCH OF KAHANAIKI STREAM IN KAILUA VALLEY, NEAR KAILUA, OAHU. Location. — About 300 feet above junction of two main brandies, 600 feet above bridge on government road, and 4 miles northwest (by road) from Waimanalo. Records available. — April 10 to December 31, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — ^Made by wading. Diversions. — None above station; small ditch 100 feet below station. . Accuracy. — Records poor. Cooperation. — Station maintained in cooperation with the Kaneohe Ranch Co. Discharge measurements of South Branch of Kahanaiki Stream in Kailua Valley, near Kailua, Oahu, in 1913. Date. Made by— Gage height. Dis- charge. Date. Made by— Gage height. Dis- charge. Apr. 11 G. K. Larrison Feet. 0.47 .84 Sec.-ft. 0.19 1.79 Sept. 9 G. K. Larrison Feet. 0.34 Sec.-ff. 0.20 ..do Monthly discharge of South Branch of Kahanaiki Stream in Kailua Valley, near Kailua, Oahu, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-ofE (total in acre-feet). Accu- racy. AprillO-30. May June July August September. . October November. . December . . 0.6 4.4 3.4 .5 1.1 2.0 .1 1.2 4.3 The period . 0.3 .2 .2 .2 .2 .1 .05 .05 .2 0.41 1.01 .70 .27 .54 .32 .07 .30 17.0 62.1 41.7 16.6 33.2 19.0 4.3 17.9 64.1 266 NORTH BRANCH OF KAHANAIKI STREAM IN KAILUA VALLEY, NEAR KAILUA, OAHU. Location. — About 400 feet above junction of two main branches, 700 feet above bridge on government road, and 4 miles northwest of Waimanalo. Records available. — April 11 to December 31, 1913. Gage. — Vertical staff up to November 25; November 26 to December 31, 1913, head read on weir crest. Control. — Probably permanent. Diversions. — Small ditch diverts about 0.3 second-foot at point about 400 feet above station, to left. Discharge measurements. — Made by current-meter imtil November 25; Novem- ber 25 to December 31 by 1.0-foot sharp-crested weir. Accuracy. — Records poor until November 25; November 26 to December 31, good. Cooperation. — Station maintained in cooperation with the Kaneohe Ranch Co. ISLAND OF OAHU. 97 Discharge measurements of North Branch of Kahanaihi Stream in Kailua Valley, near Kailua, Oahu, in WIS. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Apr. 11 G. K. Larrison Feet. 0.95 1.28 Sec.-ft. 0.11 2.76 Sept. 9 J. C. Dort Feet. 1.05 Sec.-ft. 0.54 June 4 do Monthly discharge of North Branch of Kahanaihi Stream in Kailua Valley, near Kailua, Oahu, for 1913. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. April 9-30. May June July August September. October . . . November. December.. 0.40 3.00 8.20 .30 .20 1.50 .15 .75 2.20 0.01 .05 .10 .03 .04 .05 .07 .07 .45 0.17 .49 1.04 .17 .06 .43 .09 .24 1.07 7.42 30.1 61.9 10.5 3.69 25.6 5.53 14.3 65.8 The period. 225 Note.— Apr. 9 to Aug. 31, Sept. 3-4, and Sept. 24 to Nov. 7, the Kahanaiki ditch diverted about 0.3 second-foot from the stream above the station. Water overflowed weir Dec. 10-18; discharge estimated. WAIAHOLE STREAM AT MANIANIAULA, NEAR WAIKANE, OAHU. Location. — In upper Waiahole Valley, at boundary line of government and private land, 3J miles southwest of Waikane. Records available. — September 25, 1911, to December 31, 1913. Gage. — Vertical staff; read twice daily. Control. — Probably shifting. Discharge measurements. — ^Made by wading. Diversions. — None above gage. Regulation. — Flow regulated by large springs at head of Waiahole Valley. Accuracy. — ^Records good. Discharge measurements of 'Waiahole Stream at Manianiaula, near Waikane, Oahu, in 1913. Date. Made by— Gage height. Dis- charge. Date. Made by— Gage height. Dis- charge. Mar. 1 J. C. Dort Feet. 0.96 .96 .99 1.26 Sec.-ft. 23.4 20.4 22.3 37.6 Aug. 15 Sept. 12 Oct. 1 Dec. 9 G. K. Larrison Feet. 1.29 1.39 1.30 1.30 Sec.-ft. 37.2 May 3 June 30 . . do G.R.White 43.0 do 40.1 Aug. 8 J. C. Dort J. C. Dort 39.5 97764°— wsp 373—15- 98 WATER EESOUECES OF HAWAII, 1913. Daily discharge, in second-feet, of Waiahole Stream at Manianiaula, near Waikane, Oahu, for 191S. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 19 19 19 100 22 22 22 19 19 19 19 19 19 19 19 19 19 20 20 20 20 28 22 22 22 21 21 20 20 20 21 21 21 21 21 21 21 21 21 21 21 21 21 21 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 21 21 21 21 21 20 20 20 20 20 20 20 20 20 20 19 19 19 19 20 21 21 21 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 21 20 22 22 46 23 22 22 21 21 21 21 21 21 20 20 20 21 21 21 21 21 21 21 30 27 22 22 22 .22 22 22 22 22 24 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 23 22 22 22 22 22 22 21 21 21 21 21 21 21 21 22 22 22 22 22 21 21 21 22 22 22 22 22 22 22 26 32 34 35 35 35 37 37 37 37 38 39 38 39 38 41 91 41 43 43 43 44 45 46 47 47 47 47 47 47 47 47 49 49 47 46 46 46 46 46 45 44 44 44 44 44 45 45 45 49 47 47 47 46 45 45 45 45 45 45 45 44 44 44 44 44 44 43 42 41 40 39 39 39 39 39 39 39 39 39 38 38 38 39 38 38 38 37 37 37 37 37 37 37 37 37 37 37 37 38 37 37 37 37 37 37 37 37 37 38 38 38 38 38 37 37 37 37 37 37 37 37 37 2 37 3 38 4 37 5 37 6 37 7 37 8 38 9 39 10 39 11 39 12 .... 39 13 14 39 39 15 .... 39 16 39 17 38 18 19 38 38 20 38 21 38 22 38 23 38 24 25 38 38 26 38 27 38 28 38 29 38 30 38 31 38 Note. — Beginning Aug. 1, water developed in. the Waiahole Tunnel was wasted into this stream. Monthly discharge of Waiahole Stream at Manianiaula, near Waikane, Oahu, for 1913. Month. January February March April May June July August September October November December The year Discharge in second-fe^t. Maximum. Minimum. Mean 100 28 21 20 46 30 23 91 49 44 38 39 100 18 21.4 21.0 20.2 20.0 21.6 22.4 21.7 42.0 45.8 39.8 37.2 38.1 29.3 Run-off (total in acre-feet). 1,320 1,170 1,240 1,190 1,330 1,330 1,330 2,580 2,730 2,450 2,210 2,340 21,200 Accu- racy. ISLAND OP OAHU. 99 RIGHT BRANCH OF NORTH FORK OF KAUKONAHUA STREAM NEAR WAHIAWA, OAHU. Location. — About 8 miles northeast of Wahiawa. and 200 feet up the Right Branch from the intake of the Waialua Agricultural Co. tunnel, which is at the confluence of the Right and Left Branches or two main branches of the North Fork. Records available. — May 29 to December 31, 1913. Gage. — Stevens continuous water-stage recorder. Control. — Probably permanent. Discharge measurements. — ^Made by wading or from a footbridge about 20 feet above gage. Diversions. — None above station. Accuracy. — Records fair. Cooperation. — ^The Waialua Agricultural Co. appropriated sufficient funds to cover cost of equipment and installation of station. Discharge measurements of Right Branch of North Fork of Kaukonahua Stream, near Wahiawa, Oahu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. May 30 30 J. C. Dort Feet. 2.00 1.78 1.57 1.55 3.18 Sec.-ft. 10.8 5.76 2.89 2.79 92.8 Oct. 1 31 Nov. 11 20 26 G.R.White Feet. 1.30 1.35 3.44 2.49 3.88 Sec.-ft. 0.54 do J. C. Dort .98 July 11 Aug. 21 Sept. 1 do G K Larrison . do G.R. White 120 34 7 J. C. Dort J. C. Dort 190 Daily discharge, in second-feet, of Right Branch of North Fork of Kaukonahua Stream, near Waihiawa, Oahu, for 1913. Day. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 4.0 3.7 4.2 30 6.8 5.0 4.8 4.7 4.5 4.0 3.5 3.6 4.7 10 25 5.9 9.9 5.9 4.8 4.0 6.8 9.1 35 9.1 6.3 5.2 4.9 5.0 10 15 11 36 27 10 86 9.1 7.4 6.8 5.4 4.2 3.1 2.9 2.9 2.8 3.1 2.3 2.2 2.3 2.4 2.0 1.9 1.7 1.8 1.8 2.0 2.3 4.0 2.8 2.6 3.3 1.8 1.4 1.3 1.3 1.2 1.2 1.2 1.2 1.2 1.4 3.8 1.8 67 2.5 2.1 1.7 2.8 8.3 3.2 2.2 2.0 2.9 2.5 2.2 2.5 1.7 1.4 1.4 3.2 3.3 2.1 4.4 6.2 3.8 3.2 2.2 2.1 2.0 1.8 1.6 1.6 1.6 1.4 1.4 1.4 1.5 2.2 2.1 1.6 1.6 4.1 1.8 1.6 1.9 .7 .7 .7 .7 .8 .8 .8 .8 0.8 .8 .8 .8 .8 .8 .8 .7 .6 .6 1.1 28 9.6 2.7 1.7 1.3 1.2 1.0. 1.0 1.3 2.8 3.7 2.8 1.8 3.2 3.6 1.6 1.3 1.2 1.0 1.0 1.1 3.7 3.3 1.6 1.4 1.4 4.5 15 34 45 87 114 72 20 14 9.9 8.1 7.2 16 104 56 20 15 16 80 79 46 32 20 16 8.5 2 7.4 3 40 4 55 5 21 6 43 7 27 8 14 9 11 10 9 1 11 8.0 12 7 4 13 6 8 14 5 7 15 5 4 16 5 17 5 2 18 5 6 19 5.0 20 3 9 21 3 8 22 3.6 23 3 1 24 2.7 25 2 5 26 2 5 27 2.4 28 2 3 29 9.6 8.1 4.4 2.2 30 2 2 31 1.9 Note.— No records June 21-July 10, Sept. 24-30, and Dec. 1-30 ; discharge estimated by comparison with records of station on Left Branch of North Fork of the Kaukonahua. 100 WATER RESOURCES OF HAWAII, 1913. Monthly discharge of Right Branch of North Forlc of Kaukonahua Stream near Wahiawa, Oahu, for 1913. Month. Discharge in second-feet. Maximum. Minunum. Mean Run-off (total in acre-teet). Accu- racy. May 29-31 . June July August September. October . . . November. December . 9.6 35 86 67 6.2 28 141 55 4.4 3.5 1.7 1.2 .7 .6 1.1 1.9 7.37 8.51 8.22 4.40 1.82 2.59 32.3 10.4 43.8 506 504 271 108 159 1,920 640 The period . 4,150 Note.— Actual maximum, Nov. 20, 10 p. m., 600 second-feet., actual minimum, Sept. 27, 29, and Oct. 11, 0.6 second-feet. LEFT BRANCH OF NORTH FORK OF KAUKONAHUA STREAM NEAR WAHIAWA, OAHU. Location. — About 8 miles east by north of Wahiawa and 100 feet above the intake of the Waialua Agricultural Co 's tunnel, which is at the confluence of the right and left branches or the two main branches of the North Fork. Records available. — May 25 to December 31, 1913. Gage. — Stevens continuous water-stage recorder. Control. — Probably permanent. Diversions. — None above station. Discharge measurements. — Made by wading or from cable. Accuracy. — Records good. Cooperation. — The Waialua Agricultural Co. appropriated sufiicient funds to cover the cost of equipment and installation of station. Discharge measurements of Left Branch of North Fork of Kaukonahua Stream near Wahi- awa, Oahu, in 1913. Date. Made by— Gage height. Dis- charge. Date. Made by— Gage height. Dis- charge. May 23 24 J. C. Dort Feet. 1.39 1.62 1.78 1.40 1.39 1.60 1.25 Sec. ft. 6.31 14.9 20.5 7.26 6.01 12.1 2.95 Sept. 1 1 Oct. 1 31 Nov. 20 20 26 J. C. Dort . Feet. 2.08 2.52 1.08 1.00 2.70 2.27 3.00 Sec. ft. 41 6 do . ...do 94 6 24 do G. R. White .93 27 do do J. C. Dort .99 July 11 G. R White 94 1 Aug. 31 do do 60 2 Sept. 1 do J. C. Dort .... 167 ISLAND OF OAHU. 101 Daily discharge, in second-feet, of Left Branch of North Fork of Kaukondhua Stream near Wahiawa, Oahu,for 1913. Day. May. Juae. July. Aug. Sept. Oct. Nov. Dec. 1 4.6 4.2 4.8 26 7.7 10 9.1 7.2 6.2 5.9 7.4 6.9 6.2 11 21 12 30 15 9.1 9.4 12 16 61 16 11 9.1 8.6 8.8 18 27 20 63 47 18 15 16 13 12 9.4 7.4 6.4 6.2 5.9 6.7 5.7 5.5 4.4 4.4 4.4 4.2 4.1 3.4 3.4 3.6 6.9 9.8 13 17 12 6.2 4.4 3.6 3.3 3.1 3.0 2.8 3.0 3.0 2.8 3.8 12 4.1 40 7.2 8.3 5.7 7.2 20 8.3 6.2 4.8 11 5.9 5.3 5.3 4.2 3.9 3.8 4.1 3.4 2.8 8.3 13 6.9 7.7 5.1 4.2 4.1 3.3 3.0 2.8 2.8 2.7 2.8 2.5 2.7 3.4 2.7 2.3 2.2 11 3.4 2.4 2.3 3.9 1.5 1.5 1.3 1.2 1.3 1.2 1.3 1.3 1.3 1.1 1.1 1.1 1.1 1.1 21 33 7.2 4.1 3.3 2.7 2.3 2.3 2.8 8.3 5.1 3.6 3.8 9.8 3.9 2.8 2.7 6.6 2.8 2.3 1.9 1.8 1.5 1.6 0.9 14 1.4 1.4 1.4 1.4 1.4 1.2 1.0 1.0 1.9 49 17 4.7 3.0 2.3 2.1 1.7 1.7 2.3 4.9 6.5 4.9 3.2 5.6 137 46 28 20 20 15 2 13 3 70 4 96 5 37 6 75 7. 47 8 24 9 19 10 16 11 14 12 13 13 12 14 10 15 9.4 16 8.8 17 9.1 9 8 19 8.8 20 6.9 6.6 22 6 4 23 5.5 24 4.8 5.7 5.5 5.5 5.3 4.4 7.2 5.3 4.4 4 4 27 I:! 28 4.1 29. 3 8 3.8 31 3.4 Note.— Discharge Nov. 3-25 estimated by comparison witli records of the station on the Right Branch of the North Fork of the Kaukonahua. Monthly discharge of Left Branch of North Fork of Kaukonahua Stream near Wahiawa, Oahu, for 1913. Discharge in second-feet. Maximum. Minimum. Mean, Run-off (total in acre-feet). Accu- racy. May 24-31.. June July August September. October. . . November. , December., 7.2 61 63 40 13 33 137 96 4.4 4.2 3.4 2.8 1.2 1.1 5.56 13.4 11.5 6.78 3.54 4.69 12.9 18.2 The period. 77.1 797 707 417 211 288 768 1,120 4,390 Note. — Actual maximum for year, Nov. 20, 10 p. m., 750 second-feet; actual miaimum for year, Nov. 1, 0.9 second-feet. 102 WATEE RESOURCES OP HAWAII, 1913. SOUTH FORK OF KAUKONAHUA STREAM NEAR WAHIAWA, OAHU. Location. — About 10 miles east of Wahiawa by main road to United States Army reservoir and trail up ditch bank to about one-eighth mile above the United States Army ditch intake. Records available. — June 18 to December 31, 1913. Gage. — Stevens continuous water-stage recorder. Control. — Probably permanent. Discharge measurements. — Made by wading or from cable just above gage house. Diversions. — None above station. Small ditch diverts water one-eighth mile below station for the supply of Schofield Barracks. Accuracy. — Records fair. Cooperation. — The Quartermaster Department, United States Army, appropriated sufficient funds to cover the cost of equipment and installation of this station. Discharge measurements of South Fork of Kauhonahua Stream near Wahiawa, Oahu, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. June 18 J. C. Dort Feet. 1.66 1.63 1.47 1.46 Sec. -ft. 4.27 5.42 1.41 1.14 Oct. 9 Nov. 11 Nov. 21 Dec. 17 J. C. Dort Feet. 1.55 2.21 2.00 1.58 Sec.-ft. 3.08 July 9 Sept. 13 Sept. 24 do G. R. White G. R. White 39.2 do do 29.6 J. C. Dort 6.66 Daily discharge, in second-feet, of South Forh of Kauhonahua Stream near Wahiawa, Oahu, for 1913. Day. June. July. Aug. Sept. Oct. Nov. Dec. Day. June. July. Aug. Sept. Oct. Nov, Dec. 1 27 43 28 11 15 11 7.7 8.0 5.8 5.1 4.8 4.8 4.8 4.8 ■4.8 1.1 .9 .7 .7 .7 .8 1.2 1.2 .9 1.8 2.2 35 7.7 3.0 3.2 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.2 2.5 3.0 2.0 1.8 2.7 1.2 .8 .8 .7 .7 .9 2.2 18 6.4 2.0 1.4 1.1 2.0 3.5 1.6 0.6 .7 9.6 2.2 1.1 1.0 1.1 13 88 37 28 66 35 13 8.8 63 57 51 45 39 33 30 26 22 20 17 15 13 11 9.4 16.... 4.8 4.5 4.3 4.0 3.8 3.2 3.0 2.7 2.5 5.4 4.3 7.4 12 6.4 2.7 2.0 3.8 3.8 4.0 4.3 4.5 2.2 3.0 12 2.2 1.8 2.0 2.2 1.4 2.7 2.2 2.0 2.0 4.8 16 4.5 3.2 2.5 7.4 3.8 1.8 2.2 1.2 1.0 .9 .9 1.0 1.2 1.1 1.2 1.1 .7 .7 .7 .7 1.1 4.8 1.1 .8 .8 1.2 .7 .7 7.7 7.0 7.4 14 111 43 9.8 41 119 29 92 86 80 74 68 7.8 2 17 6.7 3 18 5.9 4 19 . 5.2 5 20.... 21.... 22.... 23.... 24.... 25.... 26.... 27.... 28.... 29.... 30.... 31 23 9.6 7.0 6.1 5.4 5.4 5.1 11 17 7.4 9.6 4.9 6 4.9 7.... 4.3 8 4.0 9.... 4.0 10 3.8 11 3.6 12 3.3 13 3.1 14.... 15.... 2.9 2.7 2.5 Note. — Discharge estimated Nov. 27 to Dec. 5, and Dec. 18. Monthly discharge of South Forh of Kauhonahua Stream near Wahiawa, Oahu, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-ofl (total in acre-feet). Accu- racy. June 20-30. July August September . October November. December . . 23 5.1 43 2.0 35 .7 16 .9 18 .7 119 .6 63 2.5 8.34 3.72 2.85 2.00 36.5 16.8 The period. 211 513 229 170 123 2,170 1,030 4,450 ISLAND OF OAHU. 103 MISCELLANEOUS MEASUREMENTS. Measurements of streams on the island of Oahu at points other than regular gaging stations are listed below: Miscellaneoiis discharge measurements on Oahu in 1913. Date. Stream. Locality. height. Dis- charge. Mar. 27 Do.... Do..., Mar. 28 Apr. 4 Do. Do. Do... Apr. H Do!."! May 15 Do... Do.... May 30 Do.... Do.... Do.... June 2 June 3 June 4 July 1 Do.... Do.... July 2 Do.... Do.... Do.... Aug. 8 Aug. 15 Sept. 9 Sept. 12 Oct. 22 Oct. 31 Dec. 5 Jan. 25 Feb. 26 Mar. 29 Apr. 13 Jime 24 Feb. 26 Mar. 29 Apr. 13 Feb. 1 Aug. 8 Apr. 2 Apr. 14 May 23 Sept. 12 Nov. 10 Waialua artesian well, in flume Waialua artesian weU, ditch Hauula artesian weU Lung Do Y artesian well Drain from Young Hotel artesian weU. Alakea Street flood sewer , .do. .do. do Main Kahanaiki Kahanaiki ditch a Wong Leong's ditch 6 . Paumalu Gulch do Paumalu Stream. Walomao Stream. do do do Kalihi Sti'eam Artesian well, on Bishop estate land. Kahanaiki ditch a Branch Kahana Stream Main Branch Kahana Stream Branch Kahana Stream Waihee Stream c , Walanu Stream c Uwau Stream d Waiawa Stream Portal of tunnel do Wong Leong's ditch b Portal of tunnel do do Keaahala Spring « Pukele Stream / do do do do Waioma Stream / do do Waiahole Stream ....do Lulumaha Stream g do ....do ....do ....do Waialua do Hauula Honolulu do Alakea and Merchant Streets, Honolulu. Alakea and Queen Streets, Honolulu. Opposite Hawaii Electric Co. plant, Honolulu. 100 feet above outlet jHonolulu. Kailua Valley do do Three-fourths mile below in- take, Pupukea. Above intake, Pupukea Below Pupukeapipe, Pupukea, Above outlet of Kaau Crater.. 300 feet below outlet, Kaau Crater. Top of lower falls 900 feet elevation Upper Kalihi Valley Below Kamehameha School.. . Kailua VaUeyJ Weir No. 12 Kahana Valley . . . Weir No. 6 Kahana Valley Weir No. 2 Kahana Valley Upper Waiahole Valley Weir No. 2 Waianu Valley At weir, Waianu VaUey Above intake, Waiawa Valley. Waiahole do Kailua Valley Waiahole do do Kaneohe Below Mahoe Springs, Palolo . . do ....do ....do ....do Above Pukele, Palolo ....do ....do At Waiahole, near Waikane. . . ....do Near Honolulu ....do ....do ....do ....do Feet. 0.92 .82 1.92 .60 1.94 2.10 1.49 2.20 1.96 2.03 .62 .66 .64 L58 .74 1.10 1.12 1.80 1.08 1.60 1.66 1.61 1.49 1.71 Sec.-ft. 0.79 1.29 1.02 1.28 .60 .75 .59 4.25 5.36 1.00 .31 4.66 .13 .11 .08 .05 .27 .29 .41 2.36 1.88 .27 .74 5.91 .35 3.74 3.72 .48 2.80 25.5 26.0 4.22 31.7 25.8 22.4 .48 .50 .54 .62 19.2 1.01 .42 .62 17.8 28.8 43.4 .51 .62 .70 .60 1.78 o Diverts from Kahanaiki Stream. b Diverts from Kailua Stream. c Tributary to Waiahole Stream. <* Tributary to Waianu Stream. c Tributary to Kaneohe Stream. / Tributary to Palolo Stream. g Tributary to Nuuanu Stream. 104 WATER EESOUKGES OP HAWAII, 1913. ISLAND OF MAUI. lAO STREAM NEAR WAILUKU, MAUI. Location. — About 3 miles west of Wailuku and one-fourth mile below the forks of the stream. Records available. — ^May 7, 1910, to December 31, 1913. Gage. — Friez water-stage recorder. Control. — Fairly permanent. Discharge measurements. — ^Made by wading or from cable. Diversions. — None above station. Accviracy. — Records good. Discharge measurements of lao Stream near Wailuku, Maui, in 1913. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. Mar. 17 C.T.Bailey Feet. 2.86 4.08 Sec.-ft. 33.0 213 Dec. 4 C. T. Bailey Feet. 5.25 See.-ft. 758 Aug. 12 Bailey and Christiansen Daily discharge, in second-feet, of lao Stream near Wailuku, Maui, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 18 12 12 16 54 85 131 141 47 39 33 27 26 26 74 65 60 244 236 141 105 76 65 82 141 82 69 64 64 65 65 60 61 62 66 65 64 59 56 52 51 70 108 132 54 29 26 26 28 79 28 25 34 25 25 40 22 27 47 29 25 22 22 '"'76' 59 65 60 56 64 66 60 49 90 69 61 105 72 100 122 92 75 67 65 66 66 78 82 76 83 79 254 155 79 150 92 93 72 54 118 58 44 31 31 31 31 54 42 37 34 32 32 30 75 78 45 37 49 47 40 35 24 25 23 22 21 22 22 25 23 28 28 30 27 51 32 212 170 75 64 82 183 93 65 54 43 60 45 42 34 27 34 27 44 30 19 13 35 56 40 28 26 26 30 30 26 30 25 27 27 22 22 25 60 66 36 30 33 30 30 28 27 27 27 21 19 19 18 15 16 19 40 40 43 36 26 25 . 25 11 71 30 18 13 11 11 10 10 10 10 9 9 9 10 10 8 7 6 6 12 92 138 66 35 25 54 341 530 173 159 146 108 69 55 111 104 183 121 111 108 66 49 126 159 141 54 44 183 64 54 2 46 3 164 4 20 19 18 18 18 20 20 19 40 145 157 124 44 32 26 553 5 270 6 254 7 148 8 108 9 83 10 66 11 ""33s' 308 326 216 181 122 72 66 76 71 38 134 124 290 177 119 159 132 138 94 82 74 79 79 69 96 85 85 69 65 60 59 12 52 13 51 14 89 15 69 16 54 17 66 18 93 19 60 20 54 21 58 22 56 23 58 24 44 25 49 26 54 27 51 28 65 29 54 30 52 31 22 51 KOTE.— No record Jan. 1-3, 19-30; Apr. 5-12, 23-30; May 1, 3-10. ISLAN^D OP MAUI. 105 Monthly discharge of lao Stream near Wailuku, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. January 4-18, 31 . February March April 1-4, 13-22 . May 2, 11-31 June July August September October November December 157 244 132 338 290 254 118 212 66 71 530 553 The period. 46.3 77.5 52.1 134 106 85.2 46.3 55.0 30.9 18.8 121 95.9 1,470 4,300 3,200 3,720 4,620 5,070 2,850 3,380 1,840 1,160 7,200 5,900 44,700 MANIANIA DITCH NEAR WAILUKU, MAUI. Location. — About 2\ miles west of Wailuku and 800 feet below intake. Records available. — October 18, 1910, to September 30, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made from plank footbridge above 50 feet above gage. Accuracy. — Records fair. Discharge measurements of Maniania ditch near Wailuku, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Gage height. Dis- charge. Date. Gage height. Dis- charge. Mar. 17 Feet. 1.07 .74 Sec.-ft. 22.8 15.8 May 1 Feet. 1.56 Sec.-ft. 33.2 Apr. 8 Monthly discharge of Maniania ditch near Wailuku, Maui, for 1913. Month. Discharge in second-feet. Maximum. Miaimum. Mean. Run-off (total in acre-feet). Accu- racy. January... February. . March April May , June July , August September. 14 6.0 15 17 10 22 23 20 17 19.5 13.5 21.7 24.1 23.9 26.6 27.5 26.5 22.8 The period . 1,200 750 1,330 1,430 1,470 1,580 1,690 1,630 1,360 12,400 106 WATER EESOUKCES OP HAWAII^ 1913. SOUTH WAIEHU STREAM NEAR WAILUKU, MAUI. Location. — About 3 miles west of Wailuku and 300 feet above South Waiehu ditch intake. Records available. — March 19 to December 31, 1913. Gage. — Vertical staff. Control. — Shifting . Discharge measurements. — ^Made from footbridge or by wading. Diversions. — One small taro ditch, carrying about 0.2 second-foot at ordinary stages, diverts water above the gage. Accuracy. — Records for March, July, August, and October, good; for other months, poor. Discharge measurements of South Waiehu Stream, near Wailuhu, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Gage height. Dis- charge. Date. Gage height. Dis- charge. Mar. 18 Feet. 0.58 .76 Sec.-ft. 4.91 8.01 June 28 Feet. 0.54 .53 Sec.-ft. 3.02 Mar. 21 July 31 2.73 Daily discharge, in second-feet, of South Waiehu Stream near Wailuhu, Maui, for 1913. Day. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 3.8 20 3.8 21 3.8 22 8.8 23 3.8 24 3.8 25 3.8 26 . .. 3.8 27 3.8 28 6.0 29 3.8 30 5.1 31 3.8 3.8 4.2 3.8 4.2 3.8 3.8 3.8 3.8 3.8 3.8 30 14 49 5.6 17 29 58 38 4.4 3.8 4.4 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 4.4 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 116 128 92 17 4.7 4.2 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 6.8 10 5.6 3.8 3.8 3.8 3.8 4.2 3.8 3.8 3.8 3.8 3.8 3.8 4.7 3.8 4.7 4.7 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 3.8 62 3.8 3.8 4.7 2.4 2.8 3.0 3.0 3.0 3.0 2.8 2.8 3.0 2.8 5.1 4.7 4.2 3.8 3.8 3.4 3.0 2.6 6.0 5.1 4.7 4.7 4.7 4.4 3.4 2.6 3.4 6.0 3.6 4.7 5.4 3.4 6.0 7.4 3.4 4.7 4.9 5.4 4.7 5.6 5.8 7.7 12 3.4 5.6 5.4 14 4.9 3.8 3.8 3.8 5.1 3.8 4.0 4.0 4.0 4.0 5.1 4.7 4.7 4.0 10 3.6 92 6.5 3.6 3.6 3.8 20 6.0 3.8 3.8 4.7 3.8 4.4 3.8 3.8 5.1 11 11 5.1 4.2 4.2 3.4 4.2 3.8 4.7 4.7 4.7 4.9 4.9 4.9 6.3 6.3 7.1 4.4 5.6 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 5.1 4.2 4.7 5.6 6.0 6.5 4.0 6.5 3.8 4.0 4.0 4.0 5.6 8.8 58 5.1 4.0 4.0 76 137 58 5.1 5.1 5.1 4.7 4.7 4.7 4.9 42 48 8.2 6.3 4.9 5.1 6.8 5.1 6.0 4.4 4.2 4.2 4.7 7.1 7.7 76 177 185 143 44 8.0 5.6 4.9 5.1 5.1 4.2 78 10 9.4 9.1 6.5 6.8 6.0 6.3 4.9 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.7 5.1 ISLAND OF MAUI. 107 Monthly discharge of South Waiehu Stream near Wailuku, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Run-ofl (total in acre-feet). Accu- racy. March 19-31. April May June July August September... October November. . . December . . . 58 128 62 6 14 92 8. 137 185 3.8 3.8 3.8 3.8 2.4 3.4 3.4 3.8 4.0 4.2 4.45 11.2 15.1 5.87 3.80 5.45 8.27 5.03 18.3 27.5 The period. 115 666 928 349 234 335 492 309 1,090 1,690 6,210 SOUTH WAIEHU DITCH NEAR WAILUKU, MAUI. Location. — About 1^ miles northwest of Wailuku, one-fourth mile above Waihee canal crossing, in flume 60 feet below intake. Records available. — ^July 13, 1912, to December 31, 1913. Gage. — Vertical staff. Control. — Fairly permanent. Diversions. — Ditch diverts all low-water flow. Discharge measurements. — ^Made from 2 by 4 at gage. Accuracy. — Records good. Discharge measurements of South Waiehu ditch near Wailuhu, Maui, in 1912-13. Date. Hydrographer. Gage height. Dis- charge. Date. Hydrographer. Gage height. Dis- charge. 1912 July 13 July 16 Sept. 6 Nov. 21 J B Stewart Feet. 0.48 .45 .42 .48 Sec.-ft. 4.16 3.79 3.47 4.27 1913 Mar. 15 Mar. 19 Mar. 21 C. T. Bailey. . . . Feet. 0.72 .36 .50 Sec.-ft. 9 98 do do do do do 2.51 4.57 108 WATER EESOUECES OE HAWAII, 1913. Daily discharge, in second-feet, of South Waiehu ditch near Wailuhu, Maui, for 191S. Day. Jan. Feb. Mar.- Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 3.0 3.0 4.6 3.8 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 8.0 3.0 3.0 3.8 17 15 19 3.8 3.0 3.0 3.0 3.0 3.0 3.0 4.6 6.8 6.8 12 4.6 3.0 3.0 3.0 3.0 4.6 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 4.6 3.0 3.0 3.0 3.0 3.0 3.0 3.0 5.7 3.8 4.6 3.8 2.8 2.8 2.8 6.0 2.8 2.8 2.8 2.8 2.8 4.3 2.8 5.7 2.8 2.8 3.0 2.8 3.0 2.8 2.8 2.8 2.8 2.8 2.8 12 9.9 12 4.3 8.9 10 12 8.4 3.2 2.8 6.4 6.4 3.2 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 3.2 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 6.4 7.1 12 12 3.3 4.6 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 4.0 6.4 4.0 2.8 2.8 2.8 2.8 3.0 2.8 2.8 18 2.8 2.8- 2.8 3.3 2.8 3.3 3.3 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 7.3 2.8 2.8 3.3 3.2 4.6 2.6 2.6 2.6 2.6 2.8 2.8 2.6 2.6 2.8 3.2 3.0 3.3 3.3 3.3 3.0 2.6 6.0 3.3 2.8 2.5 2.5 3.0 2.8 2.7 2.8 3.5 3.2 3.3 3.2 2.8 3.3 3.6 2.6 3.2 3.0 3.3 3.2 3.3 4.3 4.1 7.8 2.6 3.5 3.5 9.4 3.2 2.6 2.6 2.6 3.3 2.6 2.7 2.7 2.7 2.7 3.0 3.0 3.0 2.7 6.8 2.5 15 4.6 2.5 2.5 2.6 9.4 3.0 2.6 2.6 2.9 2.6 2.9 2.4 2.4 3.0 4.0 6.3 3.3 2.8 2.8 ■ 2.4 2.7 2.6 2.9 2.9 2.8 2.9 3.0 3.0 3.0 3.0 3.5 3.2 2.8 5.9 3.0 3.0 2.8 2.8 2.8 2.8 2.8 3.0 2.8 3.0 2.8 2.8 2.9 3.0 3.2 2.7 3.2 2.8 2.8 2.8 2.8 2.8 2.8 2.7 2.7 3.2 5.0 7.3 3.2 2.8 2.8 5.7 10 9.9 4.6 2.9 3.0 3.0 3.0 3.0 3.0 3.2 8.1 7.3 6.3 4.1 3.3 3.3 4.1 3.3 4.0 2.9 2.8 2.9 3.0 4.6 2 5.0 3 7.5 4 13 5 10 6 13 7 9.9 8 5.3 9 3.6 10 3.2 11 3.3 12 3.3 13 14 2.8 8.6 15 6.8 16 6.4 17 6.1 18 4.3 19 4.4 20 4.0 21 4.1 22 3.2 23 3.0 24 3.0 25 3.0 26 .' 3.0 27 3.0 28 3.0 29 3.0 30 3.0 31 3.S Monthly discharge of South Waiehu ditch near Wailuhu, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Meaij. Run-ofl (total in acre-feet). Accu- racy. January February March April May Jime July August September October November December The year 4.6 19 , 6 12 12 7.3 5 9.4 15 5.9 10 13 3.0 3.0 2.8 2.8 2.8 2.8 2.5 2.6 2.4 2.7 2.8 2.8 3.08 5.32 3.40 4.92 3.93 3.02 3.04 3.54 3.56 3.00 4.33 5.15 19 3.83 189 295 209 293 242 180 187 218 212 184 258 317 2,780 ISLAND OF MAUI. 109 NOETH WAIEHU STREAM NEAR WAILUKXT, MAUI. Location. — One raile above Wathee canal crossing and about 2J miles northwest of Wailuku; 50 feet above uppermost diversion. Records available. — July 9, 1912, to December 31, 1913. Gage. — Vertical staff. Control. — Probably shifting. Discharge measurements. — ^Made by wading. Diversions. — None above station. Accuracy. — Records doubtful. Cooperation. — Station is maintained in cooperation with Wailuku Sugar Co. Discharge measurevients of North Waiehu Stream near Wailuku, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Gage height. Dis- charge. Date. Gage height. Dis- charge. Mar. 14 . Feet. 0.60 .59 Sec.-ft. 3.58 3.89 Julys Feet. 0.62 .60 Sec.-ft. 3.92 Apr. 10 Aug. 14 4.69 Daily discharge, in second-feet, of North Waiehu Stream near Wailuku, Maui, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 4.2 4.7 4.7 4.5 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.5 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 10 5.5 5.5 5.5 5.5 6.5 5.5 5.5 5.5 5.5 4.7 7.4 9.4 4.7 4.2 4.2 4.2 4.2 4.5 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 7.4 4.5 4.2 4.2 4.2 4.2 4.2 4.2 12 5.5 4.2 4.2 4.2 4.2 4.2 8.1 4.7 4.2 4.2 4.2 4.2 4.7 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 3.5 12 7.4 6.0 5.2 12 8.4 7.1 6.3 4.2 4.7 5.8 6.3 6.3 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 6.5 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.5 4.2 8.7 5.2 4.7 4.7 5.8 4.5 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.7 4.2 4.5 4.2 4.2 4.2 4.2 4.5 4.7 4.7 4.2 4.2 4.2 4.2 4.2 5.0 4.5 4.7 7.1 14 6.8 4.7 4.5 4.5 4.7 4.5 4.5 4.5 4.5 4.5 4.5 4.5 6.3 4.7 4.7 6.3 5.2 7.4 6.5 4.2 4.5 4.7 4.7 4.7 4.7 4.5 4.2 4.2 5.8 4.7 4.5 4.5 4.5 4.5 7.1 4.7 4.7 4.7 4.7 4.7 4.7 4.7 4.2 4.2 4.7 6.2 5.2 4.2 4.7 5.0 4.2 4.2 4.2 4.2 4.2 4.2 5.2 4.2 6.3 4.2 4.5 4.7 8.7 4.2 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 3.9 3.9 4.0 3.9 3.9 10 4.5 12 5.5 4.7 4.2 3.9 5.2 4.2 4.0 4.0 4.0 4.2 4.2 4.2 4.2 4.2 4.6 5.8 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.2 4.5 9.0 6.8 6.5 6.5 6.3 5.8 5.2 5.0 4.7 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.2 4.5 4.5 4.5 4.5 4.5 4.5 5.5 20 16 7.8 7.1 7.4 6.8 6.3 6.3 6.8 6.8 12 8.1 8.4 6.5 6.3 6.3 6.8 6.8 6.0 6.5 6.3 6.3 6.3 7.1 2 6.3 3 6.5 4 22 5 12 6 14 7 8.7 8 7.4 9 7.4 10 7.4 11 7.4 12 7.4 13 7.4 14 14 15 8.4 16 7.8 17 7.8 18 7.8 19 7.8 20 7.8 21 7.8 22 7.8 23 7.8 24 7.4 25 7.4 26 7.4 27 7.4 28 7.4 29 7.4 30 7.4 31 7.4 110 WATER EESOUECES OF HAWAII, 1913. Monthly discharge of North Waiehu Stream near Wailuku, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Run-ofiE (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 4.7 10 12 12 8.7 14 7.4 10 12 9.0 20 22 22 4.2 4.2 4.2 3.5 4.2 4.2 4.2 3.9 3.9 4.2 4.5 6.3 3.5 4.25 5.17 4.76 5.41 4.58 5.10 4.85 4.60 4.72 4.79 7.21 8.55 5.33 261 287 293 322 282 303 298 283 281 295 429 526 3,860 WAIHEE STREAM NEAR WAIHEE, MAUI. Location. — About 300 feet above Waihee canal intake, 3 miles west of Waihee, and 7 miles northwest of Wailuku. Records available. — April 1 to December 31, 1913. Gage. — Barrett & Lawrence water-stage recorder. Control. — Fairly permanent. Discharge measurements. — Made from footbridge or by wading. Diversions. — None above station. Accuracy. — Records very good except discharge December 5-31, which was estimated. Discharge measurements of Waihee Stream near Waihee, Maui, in 1913. [C. T. Bailey, hydrographer.] Apr. 2.. June 30 July 31. Gage height. Feet. 2.75 3.82 2.78 Dis- Sec.-ft. 42.2 260 45.9 Date. Aug. 13. Dec. 4... Gage height. Feet. 3.00 4.08 Dis- charge. Sec.-ft. 66.5 35.9 ISLAND OF MAUI. Ill Daily discharge, in second-feet, of Waihee Stream near Waihee, Maui, for 1913. Day. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 44 43 40 40 40 39 39 38 48 44 242 91 316 97 248 127 116 56 41 35 73 68 46 62 62 37 39 35 33 49 97 84 73 58 54 55 74 62 56 53 52 112 89 116 97 69 112 94 81 49 45 48 51 49 46 67 63 60 65 44 46 49 53 51 51 54 58 55 58 63 68 51 106 89 62 95 62 56 54 63 65 ■ 56 54 47 44 48 44 316 127 63 255 80 138 66 21 84 69 68 55 50 48 53 116 64 45 47 46 52 60 143 136 54 44 61 68 74 84 51 77 67 74 44 38 56 46 38 37 46 42 39 49 68 97 188 62 56 68 81 49 44 43 44 64 46 46 49 44 48 56 64 45 51 53 46 162 62 50 44 44 54 45 44 43 43 43 44 44 44 46 78 69 43 42 43 44 44 43 43 43 44 44 43 42 42 40 40 40 40 41 42 45 43 41 40 42 49 41 41 41 41 43 42 42 44 45 45 44 42 42 42 39 39 38 38 45 127 91 55 40 39 97 468 375 97 114 127 68 54 51 47 46 116 138 80 81 51 46 71 138 87 56 52 63 53 56 2 66 3 28 4... 584 5 248 6 97 7 57 8 57 9...^ 49 10 46 11 46 12 44 44 14 95 46 44 17 62 81 19 44 43 21 43 22 43 43 24 42 42 26 43 27 . . 44 45 29 45 46 31 45 Note. — Discharge Dec. 5-31 estimated by comparison with record on lao streaam. Monthly discharge of Waihee Stream near Waihee, Maui, for 1913. Month. Ajpril May June July August September. October... November. December., The period. Discharge in second-feet. Maximum. Minimum. Mean 316 116 316 143 188 162 49 468 584 76.3 68.1 76.6 68.4 66.7 50.8 41.7 98.8 74.5 Run-off (total iu acre-feet). 4,540 4,190 4,560 4,210 3,490 3,020 2,560 5,880 4,580 37,000 Accu- racy. 112 WATER KESOUECES OF HAWAII, 1913. SPRECKELS DITCH NEAR WAIHEE, MAUI. Location. — About 2 miles west of Waihee and about 500 feet below intake. Records available. — November 16, 1910, to September 30, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made by wading. Diversion. — Ditch, is second diversion from Waihee Stream. Accuracy. — Records fair. Discharge measurements of Spreckels ditch near Waihee, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Gage height. Dis- charge. Feet. 0.11 1.80 Sec.-ft. 0.51 68.9 Monthly discharge of Spreckels ditch near Waihee, Maui, for 1912-13. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. 1912. January.. February. March April June July August September. October November. December.. 0.0 1.0 7.2 7.2 1.8 .5 1.0 .0 1.0 1.0 1.6 1.6 2.24 18.4 31.4 35.7 13.9 9.04 16.8 10.2 2.90 10.7 19.1 12.8 The year. 82 15.2 1913. January.. February. March April June , July August September . 1.0 1.0 .5 .5 1.6 1.2 .9 1.4 .5 13.6 13.6 23.9 11.8 12.2 9.34 8.78 2.73 The period. 138 1,060 1,930 2,120 855 538 1,030 627 173 658 1,140 787 11, 100 605 755 836 1,420 726 726 574 540 162 6,340 Note.— Ditch dry, Jan. 15-18, 21-24, and Aug. 27-30, 1912. ISLAND OF MAUI. 113 KAHAKULOA STREAM AT KAHAKULOA, NEAR WAIHEE, MAUI. Location— About 13 miles northwest of Wailuku at trail bridge of Kahakuloa, below all diversions. Records available. — August 27, 1912, to March 31, 1913. Gage. — Staff gage on left bank, just below trail bridge. Control. — Probably permanent. Discharge measurements.^ — ^Made by wading. Accuracy. — Records good. Station discontinued March 31, 1913, and record continued at new station 3 miles above mouth of stream by water-stage recorder. Daily discharge, in second-feet, of Kahakuloa Stream at Kahakuloa, near Waihee, Maui, for 1913. Day. Jan. Feb. Mar. Day. Jan. Feb. Mar. Day. Jan. Feb. Mar. 1 6 6 10 6 5 5 5 5 5 5 3 3 3 3 3 137 36 26 6 5 5 5 5 5 5 5 18 8 10 5 11 5 5 21 18 10 8 6 4 3 3 3 3 3 3 4 10 6 83 39 10 5 5 5 5 20 9 11 5 5 5 21 3 5 5 5 5 5 5 3 3 3 3 8 6 6 6 18 7 5 5 5 2 12 22 25 3 13 33 7 4 14 24 5 5 . ... 15 25 10 6 16 26 .... 5 7 17 27 5 8 18 28 9 9 19 29 6 10 20 30 5 31 5 Monthly discharge of Kahakuloa Stream at Kahakuloa, near Waihee, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-ofE (total in acre-feet). Accu- racy. January . . February March 21 137 25 6.0 16.1 7.5 369 KAHAKULOA STREAM NEAR HONOKAHAU, MAUI. Location. — About 12 miles southeast of Honokahau and 3 miles above mouth of stream. Records available. — ^January 22 to August 31, 1913. Gage. — Stevens water-stage recorder. Control. — Fairly permanent. Discharge measurements. — Made from footbridge or by wading. Diversions. — None above station. Accuracy. — Records for January, June, and July, good; for other months, poor. Discharge measurements of Kahakuloa Stream near Honokahau, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Gage height. Dis- charge. Date. Gage height. Dis- charge. Jan. 23 Feet. 1.00 1.17 Sec.-ft. 1.65 3.57 May 21 Oct. 5 Feet. 1.10 1.10 Sec.-ft. 2.46 Mar. 9 2.65 97764°— WSP 373—15- 114 WATER EESOUECES OF HAWAII^ 1913. Daily discharge, in second-feet, of Kahakuloa Stream near Honokahau, Maui, for 1913. Day. Jan. Feb. Mar. Apr. May. Jiiiie. July. Aug. 1 2.4 2.0 1.6 1.6 8.2 38 2.2 2.6 3.0 3.4 8.7 4.1 4.5 4.9 5.3 5.7 6.0 6.4 6.8 7.2 3.7 2.5 2.3 2.2 8.2 3.1 2.2 2.1 2.0 2.0 1.9 2.0 1.8 1.8 7.2 3.0 4.0 2.3 2.1 2.0 2.0 2.3 ""i.'i 2.5 2.8 59 34 86 26 68 35 35 8.2 8.8 6.2 32 18 8.5 5.1 15 5.5 7.5 3.7 3.4 3.2 3.2 3.7 3.2 2.8 2.6 2.5 8.5 5.3 25 8.2 14 13 12 11 9.7 8.5 7.3 6.1 4.9 3.7 3.1 3.7 5.8 3.8 3.8 7.5 6.9 5.5 7.2 8.2 4.4 4.0 3.6 11 9.5 4.4 5.1 5.8 5.3 5.1 7.5 7.5 5.1 20 9.8 4.2 6.9 4.0 3.2 3.2 2.8 2.6 3.0 3.0 3.1 5.1 3.6 73 23 9.8 22 11 19 4.7 3.6 10 5.3 3.2 3.1 2.8 3.1 3.7 13 5.5 2.8 2.6 3.0 3.6 3.1 5.5 2.8 2.6 3.0 3.0 3.1 2.8 4.7 3.4 3.4 3.4 2.8 2.8 3.0 2 11 3 3.6 4 3.0 5 3.4 6 3.8 7 3.7 8 8.5 9 3.1 10 8.5 11 11 2.2 13 3.7 3.1 15 2.8 16 2.8 2.8 18 2.6 2.6 20 21 1.6 1.6 1.8 2.0 1.9 2.0 1.9 1.6 1.5 2.0 23 25 26 27 28 30 31 Note.— No record Mar. 15 to Apr. 7 and Aug. 20-31. Monthly discharge of Kahakuloa Stream near Honokahau, Maui, for 1913. Month. Discharge in second-feet. Run-ofl (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. January 22-31 .'. 2.0 38 7.2 86 25 73 19 11 1.5 1.6 1.8 1.7 2.5 2.6 2.6 2.2 1.79 5.21 2.60 20.7 6.94 9.14 4.73 4.48 36 289 72 944 427 544 291 169 A. February D. March 1-14 D. April8-30 D. May D June '. A. July A. August 1-19 D. The period 2,770 Note.— No record Mar. 15 to Apr. 7. Automatic gage out of order Aug. 20 to Dec. 31, 1913. ISLAND OF MAUI. 115 HONOKAHAU STREAM NEAE HONOKAHAU MAUI. Location. — On right bank, 1,000 feet above Honokahau ditch intake, about 6 miles southeast of Honokahau post office. Records available. — ^March 6 to December 31, 1913. Gage. — Stevens water-stage recorder. Control. — Fairly permanent. Discharge measurements. — Made from cable 400 feet below gage or by wading. Diversions. — None above station. Accuracy. — Records good. Discharge measurements of Honokahau Stream near Honokahau, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Gage height. Dis- charge. Date. G ge height. Dis- charge. Mar. 7 Feet. 1.19 1.07 1.20 Sec.-ft. 19.0 17.3 20.0 July 8 Feet. 1.21 1.18 1.11 Sec.-ft. 19.8 8 Aug. 22 19.1 May 21 Oct. 4 17 Daily discharge, in second-feet, of Honokahau Stream near Honokahau, Maui, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 35 21 19 17 18 17 17 17 26 19 183 155 248 106 200 125 129 61 30 32 62 44 61 ....... ""ii 29 22 73 43 46 24 21 20 24 25 21 24 47 "'"24" 22 20 24 29 23 45 33 29 27 25 21 20 20 21 22 24 28 28 27 33 43 22 68 75 28 62 28 21 20 19 18 19 20 22- 21 29 24 127 134 53 106 71 98 36 34 52 42 30 24 20 20 20 44 45 29 23 20 20 20 36 54 25 24 26 30 27 25 20 24 22 21 20 20 23 26 20 20 30 26 24 22 53 35 183 37 36 42 58 24 19 18 18 22 22 20 26 22 20 39 22 17 17 17 16 16 16 16 16 18 17 18 16 16 18 17 44 36 55 19 16 16 16 49 43 22 21 16 16 16 16 15 15 15 15 25 18 17 18 16 15 15 15 77 91 49 21 19 30 195 257 99 122 129 65 28 26 50 57 117 123 42 89 36 28 95 135 113 38 25 23 22 22 2 22 3 44 4 264 5 151 6 145 7 30 18 19 16 16 16 15 16 53 68 25 19 17 17 26 90 20 16 40 16 18 34 18 24 55 55 8 41 9 35 10 34 11 34 12 . .. 35 13 35 14 65 IS 46 16 32 17 46 18 83 19 32 20 28 21 29 22 27 23 26 24 26 25 26 26 26 27 25 28 25 29 25 30 25 31 25 Note.— No record Jan. 1 to Mar. 6, Apr. 24-27, May 10-15, 18-19, and Aug. 29 to Sept. 20. 116 WATEE EESOTJEGES OF HAWAII^ 1913. Monthly discharge of Honokdhau Stream near HonoTcahau, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. March 7-31 April 1-23, 28-30. May 1-9, 16-31... Jime July August 1-28 September 23-30. October November December 90 248 73 134 98 183 18 55 257 264 The period. 28.1 66.1 30.0 39.4 32.3 33.1 16.6 21.6 73.9 49.5 1,390 3,400 1,370 2,340 1,990 1,840 329 1,330 4,400 3,040 21,400 HONOKAHAU DITCH AT INTAKE, NEAR HONOKAHAU, MAUI. Location. — About 9 miles by trail above Honokaliau, 350 feet below ditch intake. Records available. — February 3, 1907, to September 6, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made from plank at gage. Diversion. — Ditch diverts total low flow of Honokahau Stream. Accuracy. — Records good. Cooperation. — Gage is the property of the Honolua Ranch Co. Discharge measurements of Honokahau ditch at intake near Honokahau, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Gage height. Dis- charge. Mar. 7 Feet. 1.88 1.88 Sec.-ft. 20.5 July 10 19.7 Monthly discharge of Honokahau ditch at intake, near Honokahau, Maui, for 1913. Month. January February March April May June July August September 1-6 . . . The period. Discharge in_ second-feet. Maximum. Minimum. 21.8 24.1 22.5 30.4 28.3 27.9 27.3 24.3 23.2 Run-off (total in acre-feet). 1,340 1,340 1,380 1,810 1,740 1,660 1,680 1,490 276 12, 700 Accu- racy. ISLAND OF MAUI. 117 HONOLUA STREAM NEAR HONOKAHAU, MAUI. Location. — About 2 miles south, of Honokahau and 300 feet above Honokabau ditch crossing. Kecords available. — March 12 to December 31, 1913. Gage. — Vertical staff. Control. — Probably shifting. Discharge measurements. — Made by wading. Diversions. — None above station. Accuracy. — Records for low and medium stages good; flood records are little more than estimates. Discharge measurements of Honolua Stream near Honokahau, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Mar. 12 May 20 May 22 height. Feet. 0.53 .81 .69 Dis- charge. Sec.-ft. 0.74 4.11 2.36 Date. July 10. Aug. 22. Gage height. Feet. 0.55 .46 Dis- charge. Sec.-ft. 1.45 .78 Daily discharge, in second-feet, of Honolua Stream near Honokahau, Maui, for 1913. Day. Mar. Apr. June. July. Aug. Sept. Oct. Nov. Dec. 0.8 .6 .5 12 15 5.6 2.2 1.4 .7 1.0 27 3.7 1.1 2.9 1.4 1.1 2.2 1.2 .8 3.2 3.0 1.2 1.1 .4 .4 .4 .4 .4 37 22 56 28 51 37 27 15 12 16 10 15 7.2 31 7.6 9.1 5.4 5.0 4.0 2.4 3.7 4.0 2.6 1.9 1.2 1.2 26 4.4 14 28 8.3 7.4 12 18 5.0 3.2 2.5 2.4 2.6 2.6 2.4 3.2 3.3 3.2 3.4 1.6 1.2 1.2 1.4 2.4 1.9 2.7 2.4 1.6 2.1 5.6 2.2 6.5 13 2.4 5.6 2.6 1.6 .9 .7 .6 .5 .5 .5 .5 .5 1.0 14 24 16 12 13 13 6.0 5.2 4.1 6.9 3.3 2.4 1.7 1.4 1.4 1.6 7.7 4.1 2.1 1.5 1.3 1.2 1.0 4.1 2.6 1.5 1.4 1.5 2.0 1.6 1.4 1.0 4.6 1.0 .7 2.4 2.1 43 4.4 5.4 14 1.4 5.4 6.0 1.5 11 2.6 2.1 1.5 1.3 .6 .6 .6 .6 2.2 1.4 1.0 0.4 .4 2.8 4.6 6.0 .6 .6 .6 5.2 1.2 1.2 .8 .7 .5 .5 .4 24 0.6 .7 24 4.4 3.1 1.5 1.2 40 17 11 9.6 8.2 6.2 3.7 3.4 3.0 3.0 38 69 3.8 3.0 2.2 1.7 3.6 30 54 15 3.4 1.9 1.4 1.7 1.5 1.5 85 55 51 6.9 11 3.8 3.0 3.0 3.0 2.8 25 8.5 5.4 39 6.0 6.9 5.2 4.3 4.8 3.6 3.3 3.0 2.8 2.6 2.6 2.2 2.1 2.1 118 WATER EESOURCES OF HAWAH^ 1913. Monthly discharge of Honolua Stream near Honohahau, Maui, far 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (in acre-feet). Accu- racy. March 12-31. April June July August September . October... November. December . The period. 27 0.5 5fi .4 28 1.2 24 .5 13 .8 43 .7 6 .4 24 .3 69 .6 85 1.5 4.22 13.7 5.69 4.27 3.17 3.94 1.12 1.94 12.2 11.6 168 815 350 254 195 242 67 119 726 713 3,650 HONOKAWAI STREAM NEAR LAHAINA, MAUI. Location. — Eight miles nortlieast of Lahaina, 500 feet below junction of Honokawai and Amalu streams. Records available. — ^May 13 to December 31, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made from footbridge or by wading. Diversions. — Most of tbe normal flow is diverted into Honokawai ditch half a mile above gage. Accuracy. — Low-flow records good; flood discharges only estimates. Discharge m.easurements of Honokawai Stream near Lahaina, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Gage height. Dis- charge. May 16 . - . .... . Feet. 1.23 .97 Sec.-ft. 1.06 May 23 .10 Monthly discharge of Honolatvai stream near Lahaina, Maui, for 1913. Month.' Discharge in second-feet. Maximum. Minimum. Mean, Run-off (total in acre-feet). Accu- racy. May 13-31. June July August September. October. .. November. December . 12 9.6 12 7.0. 2.2 10 18 21 0.2 .0 .0 .0 .0 .0 .0 .0 2.41 1.43 1.11 .66 .09 .48 3.76 1.65 90.6 85.1 68.2 40.6 5.5 29.5 224 101 The period. 644 Note.— No discharge during periods as follows: June 1; July 9, 11, 16, 17, 24-31; Aug. 1-9, 11, 18-27, 30; Sept. 1, 2, 4-17, 19-30; Oct. 1-5, 9-12, 15-25, 27-31; Nov. 1, 2, 6, 7, 14, IS, 23, 28-30; Deo. 1-3, 12-14, 16, 19-31. ISLAN^D OF MAUI. 119 HONOKAWAI DITCH NEAR LAHAINA, MAUI. Location. — ^Two miles above Pioneer Mill Co.'s power house, and about 7 miles northeast of Lahaina; 250 feet below junction with Amalu wooden flume and 1,000 feet below intake. Records available. — July 1, 1912, to December 31, 1913. Gage. — A graduated rod gage, which the observer places in the center of flume each time a reading is taken. Control. — Probably permanent. Discharge measurements. — Made in flume near gage. Diversion. — Ditch diverts all low-water flow from Honokawai and Amalu streams. Accuracy. — Records good except extremely high discharges. Cooperation.- — Station maintained in cooperation with Pioneer Mill Co. Discharge measurements of HonoJcawai ditch near Lahaina, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Dis- charge. Apr. 18. Aug. 21. Sec.-ft. 10.6 6.24 Daily discharge, in second-feet, of HonoJcawai ditch near Lahaina, Maui, for 1912-13. Day. July. Aug. Sept. Oct. Nov. Dec. Day. July. Aug. Sept. Oct. Nov. Dec. 1912. 1 . . . 7.9 7.9 8.6 7.5 8.6 9.3 6.7 17 10 7.9 6.7 11 7.2 6.7 6.5 6.7 6.5 6.5 6.5 6.6 6.5 7.5 7.5 13 16 7.9 8.2 7.9 8.6 18 6.5 18 7.2 7.5 6.8 6.8 14 6.7 7.4 6.5 6.5 6.2 6.2 6.2 6.2 13 6.8 6.7 6.5 7.2 6.8 6.2 6.8 6.5 6.5 8.9 7.5 7.2 12 9.3 7.0 6.5 6.2 6.0 5.9 6.2 6.2 6.4 22 8.9 8.2 6.5 6.2 6.2 6.0 8.9 12 20 6.7 5.9 5.9 11 13 6.5 6.0 5.9 5.9 5.9 7.2 7.2 1912. 16 17 7.5 6.5 6.5 6.5 12 8.2 7.0 12 6.8 6.5 6.5 6.8 7.2 6.7 6.7 6.8 14 7.9 6.7 6.5 6.5 6.5 8.6 6.8 6.5 6.5 13 9.1 6.7 9.6 8.2 7.2 6.2 6.2 6.2 6.2 6.4 7.2 6.8 6.2 6.2 6.2 6.2 6.2 6.7 9.1 10 6.4 6.4 6.2 6.2 6.0 8.6 20 10 8.4 6.5 14 15 17 6.5 11 22 22 22 23 11 8.7 14 8.6 9.1 6.8 6.2 6.2 5.9 6.2 5.9 5.8 6.5 2 6.2 3 . .. IS 5.9 4 19 17 5 . 20. 8.2 6 21 22 17 7 22 8 23 16 9 24 8.7 10 25 26 6.5 11 17 12 27 . ... 6.7 13 28 12 14 29 30 31 . 7.0 15 14 6.5 120 • WATER EESOUECES OF HAWAII, 1913. Daily discharge, in second-feet, of Honohawai ditch near Lahaina, Maui, for 1912-13 — Con. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1913. 1 6.8 6.4 17 6.2 5.8 5.8 5.8 8.2 8.6 10 6.5 5.9 23 23 23 7.7 6.2 6.0 6.2 5.8 5.6 6.6 5.6 5.6 5.6 5.6 5.6 5.3 5.0 5.0 5.4 5.3 5.0 5.0 5.0 4.9 10 6.2 17 5.6 5.0 5.2 5.0 5.0 5.0 6.5 6.2 5.3 22 17 5.9 5.9 5.3 5.0 5.0 12 5.8 5.2 5.0 5.0 5.0 6.0 5.0 4.9 4.9 4.9 4.9 4.9 4.9 4.9 4.8 4.8 4.8 10 13 5.9 5.6 5.0 5.0 12 21 5.6 6.0 12 5.2 5.3 11 5.3 8.9 14 15 6.5 5.6 6.3 6.2 5.0 5.0 4.9 6.8 5.0 20 22 22 21 23 22 21 20 8.2 8.4 8.6 6.7 8.6 9.6 8.9 7.2 9.6 8.2 8.6 6.4 12 8.6 10 6.5 6.5 5.3 5.0 6.2 5.0 5.0 6.6 12 8.0 8.2 3.8 4.8 6.2 7.0 5.0 5.8 6.3 5.3 5.4 7.5 7.2 6.9 6.9 5.9 5.3 5.0 5.0 4.9 4.9 5.6 5.0 6.0 6.2 6.6 6.8 6.8 6.8 6.3 7.6 8.6 6.7 6.6 6.2 5.6 5.2 5.0 5.0 5.0 5.0 5.4 5.6 6.8 6.9 11 17 7.9 9.6 9.6 8.9 8.0 8.6 8.6 8.2 7.5 6.2 5.6 5.3 5.3 7.2 7.5 7.5 6.2 5.4 5.3 5.8 7.9 6.2 6.2 7.0 6.6 6.2 5.8 5.3 5.0 5.6 5.0 5.0 5.0 6.0 5.0 5.0 5.0 5.2 7.9 6.3 6.8 5.0 7.9 5.2 23 7.4 10 9.6 11 8.2 5.3 6.0 5.0 5.0 5.0 5.0 5.0 5.3 6.0 10 11 7.2 5.9 13 5.3 5.0 7.9 5..6 5.2 5.0 5.0 5.3 6.6 5.3 5.2 5.9 5.3 5.0 6.3 6.2 9.1 12 9.1 6.3 6.0 6.0 5.0 5.0 4.8 4.8 4.8 4.8 5.2 5.3 5.3 5.2 5.3 5.4 5.0 7.9 7.7 15 6.8 5.0 5.3 6.0 11 10 6.4 5.3 5.0 5.0 5.0 4.9 6.0 6.0 5.0 5.2 9.1 8.4 5.3 5.0 5.0 6.0 6.0 5.0 5.0 16 14 6.9 6.3 6.2 18 18 16 16 19 13 6.5 6.2 8.6 14 16 16 8.6 16 7.4 6.2 12 16 16 12 6.2 5.9 6.3 6.8 2 5.3 3 5.0 4 11 6 6.2 6 7. a 7 6.6 8 5.0 9 6.5 10 6.8 11 5.9 12 5.8 13 5.6 14 5.9 IS 6.2 16 6.3 17 6.8 18 14 19 8.0 20 5.9 21 6.3 22 6.3 23 6.0 24 6.0 25 5.0 26 5.3 27 5.0 28. 5.0 29 5.0 30 6.0 31 5.0 Monthly discharge of Honohawai ditch near Lahaina, Maui, for 1912-lS. Month. Discharge in second-feet. Maximum. Minimum. Mean. Eun-oflf (total in acre-feet). Accu- racy. July August September. October November. December . . 1912. The period . January ... February. . . March April May June July August September. October November. December.. 1913. The year. 23 22 21 23 12 17 9.5 23 12 15 19 14 23 6.5 6.6 6.2 6.0 6.8 5.9 5.0 4.9 4.8 4.9 3.8 4.9 5.0 5.0 4.8 4.9 5.0 6.0 8.06 8.52 7.36 9.29 9.19 9.81 8.19 7.19 7.06 11.1 6.49 6.61 6.56 7.26 5.78 6.27 11.2 6.17 7.48 495 524 438 571 547 603 3,180 504 399 433 660 399 393 403 446 344 386 666 379 6,410 ISLAND OF MAUI. 121 KAHOMA DITCH AT WEIR, NEAR LAHAINA, MAUI. Location. — About 3J miles east of Lahaina, at portal of the lower of two development tumiels of Pioneer Mill Co. Records available. — August 1, 1911, to December 31, 1913. Gage.— Staff. Discharge measurements.^ — A 4-foot sharp-crested weir with end contractions; measured discharge from development tunnel and amount diverted by small pipe from stream. Measurements checked by current meter. Accuracy. — Records very good. Cooperation. — Records kept by Pioneer Mill Co. Discharge measurements of Kahoma ditch at weir, near Lahaina, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Dis- charge. Apr. 14. Aug. 19 . Sec.-ft. 7.54 3.79 Daily discharge, in second-feet, of Kahoma ditch at weir, near Lahaina, Maui, for 1913. Day. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Jan. Feb. Mar. Apr. May. Jime. July. Aug. Sept. Oct. Nov. 3.50 2.76 2.76 6.19 5.58 3.00 6.19 3.37 3.76 3.37 3.37 3.24 2.76 2.88 5.58 4.71 3.00 7.97 3.37 3.50 3.37 3.37 4.02 2.76 2.76 4.43 4.43 3.00 7.64 3.37 4.43 3.37 6.50 3.37 2.64 2.76 3.12 3.63 3.00 7.80 3.37 3.50 3.37 6.19 3.12 2.64 2.76 3.12 3.12 3.00 7.14 3.37 3.50 3.37 4.43 2.88 3.89 2.76 3.00 3.12 3.89 5.88 4.71 3.37 6.82 3.76 2.88 7.64 2.76 3.00 3.12 3.63 5.29 5.73 3.37 5.58 3.50 3.89 3.89 2.76 2.88 3.12 3.63 4.71 4.16 3.37 6.19 6.82 7.14 2.88 2.76 5.58 3.00 4.71 3.63 3.63 3.37 4.43 7.80 6.35 2.88 2.76 3.37 3.00 5.58 3.50 3.50 3.37 3.63 6.82 4.29 2.76 2.76 7.80 3.00 3.63 3.37 3.50 3.37 3.50 6.50 5.29 2.76 2.76 7.80 5.43 4.71 4.99 7.80 3.63 3.50 6.98 7.14 2.76 2.76 7.97 4.85 6.19 5.29 5.58 3.76 5.58 5.58 7.14 2.64 2.76 6.82 6.66 4.43 5.29 5.58 3.63 5.73 4.71 7.47 5.73 4.43 8.14 6.35 5.58 4.43 5.88 3.63 3.76 4.99 4.43 3.00 5.43 7.80 4.43 4.43 3.63 5.43 4.16 3.76 5.88 3.63 2.88 5.14 7.97 3.63 3.37 3.63 4.85 5.58 3.50 6.50 3.12 7.64 3.89 7.14 6.04 3.37 3.50 4.02 7.80 3.50 6.50 3.63 6.66 3.12 5.29 5.73 3.12 5.14 3.63 5.14 3.50 6.98 3.12 3.37 2.88 4.99 3.63 3.12 5.58 3.76 3.76 3.50 5.14 3.12 3.63 6.19 5.73 3.37 3.00 3.89 3.50 3.50 3.50 5.58 2.88 2.88 6.82 4.57 3.37 3.00 3.63 3.50 3.37 3.50 4.57 2.88 2.76 3.63 5.88 3.12 3.00 4.16 3.50 3.37 3.50 4.43 2.88 2.76 3.12 5.29 6.19 3.00 4.71 3.37 3.50 4.71 7.80 2.88 5.58 5.14 6.50 3.50 4.43 3.76 4.02 3.37 5.88 7.47 2.88 4.16 3.12 4.29 5.88 4.99 3.50 3.50 3.37 4.43 7.14 2.88 4.16 4.71 5.58 3.89 5.58 3.50 3.50 • 3.37 3.63 6.04 2.88 4.16 6.19 6.19 3.37 6.98 3.50 5.58 3.37 3.50 4.43 2.88 3.63 4.99 3.12 5.58 3.37 4.43 3.37 3.50 3.89 2.88 4.43 3.63 3.12 6.19 3.37 4.43 3.37 3.50 3.89 2.88 6.82 3.00 3.37 5.88 3.50 Dee. 3.76 3.76 3.76 7.47 6.50 6.19 4.57 3.89 3.50 3.50 3.37 3.37 3.37 3.37 3.37 3.37 3.37 6.50 4.71 3.89 3.37 3.37 3.37 3.37 3.37 3.37 3.37 3.24 3.24 3.24 3.24 122 WATEE EESOUECES OF HAW AH, 1913. Monthly discharge of Kahoma ditch at weir, near Lahaina, Maui, for 1913. Month. Discharge m second-feet. Run-off (total in acre-feet). Accu- Maximum. Minunum. Mean. racy. 7.47 7.64 6.82 8.14 6.66 6.98 7.97 7.80 7.80 6.82 7.80 7.47 2.88 2.64 2.76 2.88 3.00 3.00 3.37 3.37 3.37 3.37 3.37 3.24 3.92 3.75 3.79 5.49 4.15 4.14 4.69 4.32 3.80 4.08 5.58 3.94 241 208 233 327 255 246 288 266 226 251 332 242 A A A A May A A July A A A A A A 8.14 2.64 4.30 3,120 LAHAINALTJNA STREAM NEAR LAHAINA, MAUI. Location. — One-fourth mile above Lahainaluna Seminary, about IJ miles northeast of Lahaina, and 8 feet above Pioneer Mill Co.'s upper ditch intake. Previous to May 7, 200 feet downstream from present location. Records available. — August 1, 1911, to December 31, 1913. Gage. — Vertical staff; datum changed May 7, 1913. C ontrol. — Shifting . Disch.arge measurements. — Made by wading. Diversions. — Most of the normal flow of the stream is diverted into Lahainaluna ditch about 1 mile above the gage. Accuracy. — Records good except for flood discharges. Cooperation. — Station maintained in cooperation with Pioneer Mill Co. Discharge measurements of Lahainaluna Stream, near Lahaina, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Apr. 15 Apr. 17 May 7 a Gage height. Feet. 1.95 1.45 1.02 Dis- charge. Sec.-ft. 125 54.7 1.00 Date. May 12. May 16. Aug. 19. Sept. 30 height. Feet. 1.18 1.40 1.18 1.15 Dis- charge. Sec.-ft. 1.73 3.07 .96 .91 a Gage moved upstream 200 feet; new datum. ISLAND OP MAUI. 123 Daily discharge, in second-feet, of Lahainaluna Stream near Lahaina, Maui, for 1912-13. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1912. 1 2.2 2.3 1.8 1.8 2.0 1.6 1.6 2.2 2.0 1.6 1.8 1.8 1.6 1.6 1.6 1.6 1.6 1.5 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.2 1.2 1.2 1.3 1.3 1.2 1.2 1.2 1.1 1.1 1.2 1.2 1.3 1.3 1.3 12 12 8.6 1.6 1.3 1.1 1.1 1.0 1.2 1.1 1.1 1.2 1.2 1.2 1.2 1.2 1.3 1.3 1.5 1.2 2.5 2.3 1.5 1.5 1.4 1.3 1.3 1.3 2.0 1.3 1.3 1.3 1.2 1.2 1.2 1.2 1.2 11 46 124 55 8.0 3.9 3.6 3.5 100 6.8 1.8 1.3 1.3 1.3 1.3 1.3 1.4 1.4 22 1.4 1.4 1.3 1.3 1.3 1.3 1.3 1.4 1.3 8.0 7.0 1.4 1.5 1.4 1.4 1.3 3.6 1.4 1.3 1.3 1.5 3.6 3.9 2.0 1.8 1.6 3.1 2.3 4.6 2.5 22 3.6 3.1 1.5 1.5 1.5 10 6.4 1.6 2.7 1.5 1.5 1.3 1.3 1.2 1.2 1.0 1.0 1.4 5.1 6.8 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.2 1.2 1.2 1.5 1.4 2.2 1.4 1.4 1.3 4.3 8.0 1.4 1.3 2.6 1.4 1.9 4.7 1.4 3.2 10 7.0 11 6.6 5.6 32 16 46 20 8.8 7.2 3.5 3.2 3.1 8.0 1.8 1.6 1.9 1.8 1.5 1.5 1.5 3.1 1.6 2.8 8.8 3.9 2.0 1.8 1.5 1.8 2.4 2.2 1.6 1.4 1.4 1.3 1.3 1.3 2.7 1.4 78 44 85 12 88 15 18 5.6 2.4 2.4 2.4 2.0 3.6 1.7 6.4 1.8 1.9 2.2 1.6 1.6 1.8 3.4 1.4 2.9 4.4 5.1 1.5 4.2 1.5 1.5 1.5 1.4 1.3 1.3 1.3 1.3 1.3 1.3 2.7 1.5 6.4 2.8 1.8 2.7 1.5 3.6 19 4.4 1.6 1.5 1.5 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.3 1.3 1.7 3.0 32 12 3.9 3.5 4.6 5.5 2.9 1.9 1.9 1.9 3.4 2.0 2.8 2.0 1.7 1.6 1.6 1.6 1.5 1.4 1.3 1.3 10 1.1 1.1 1.1 2.5 1.4 1.3 1.3 1.3 1.5 1.8 2.0 1.8 1.3 1.5 1.8 8.0 1.5 1.6 5.1 1.5 1.5 1.3 1.3 1.3 1.3 1.6 1.6 1.6 1.6 1.6 2.4 2.7 2.3 4.1 7.9 1.7 5.5 6.0 1.8 1.7 1.7 1.5 1.5 1.4 1.4 1.4 1.4 1.4 1.8 2.3 3.9 6.2 21 3.7 20 2.2 1.6 2.2 3.9 2.0 1.1 1.5 1.1 7.6 1.5 1.5 1.3 2.2 1.4 1.2 1.1 1.3 1.1 1.1 1.0 1.3 1.3 1.3 3.6 1.4 1.0 2.0 1.1 1.1 1.1 1.0 13 27 6 3.4 26 6.0 3.9 2.6 1.9 2.0 1.9 4.8 6.3 2.8 2.3 1.9 1.9 1.9 2.0 2.3 1.9 2.0 4.4 2.2 2.3 2.0 2.0 1.6 1.5 1.5 1.5 1.1 1.1 1.1 1.1 1.1 1.0 1.0 1.4 2.5 4.6 8.0 3.1 1.0 1.0 3.5 2.0 1.8 .5 .5 .5 .5 2.0 1.0 .5 .5 .9 .5 1.1 1.8 2.5 2.2 1.6 1.6 1.6 1.6 1.6 3.2 2.0 1.7 1.6 2.0 1.7 66 2.0 4.0 2.2 9.8 2.3 .8 1.0 .9 .9 .9 .9 1.5 1.0 .8 .8 1.0 .8 .9 3.1 2.2 14 1.4 1.8 .7 16 5.8 .9 1.0 .5 .5 .5 .5 .5 .5 .5 .7 .7 .9 .8 .8 .8 .8 .8 .9 .9 .9 .9 1.8 7.2 0.7 .7 1.0 .9 .7 .6 .6 .7 .6 .7 1.4 .9 2.0 .9 .8 1.5 7.1 30 1.1 .7 .9 .9 1.0 .8 .8 .7 .7 .7 1.0 .8 3.6 2.8 .9 .5 .5 .7 .7 1.8 .7 .8 .8 .7 1.0 2.3 .7 .8 .7 .7 .7 .7 3.1 2.8 4.2 1.1 .6 8.0 7.0 2.5 1.3 3.2 78 0.9 .7 .9 .8 .7 8.6 1.0 15 1.2 .5 .6 .8 32 4.8 1.2 .6 .6 .7 .6 .7 .7 . 7 .7 .9 22 1.4 .7 .7 .6 .6 .6 2.0 .7 .7 .6 .8 .8 .7 1.6 132 3.9 5.1 2.3 1.5 1.0 1.0 3.1 5.6 6.4 4.2 3.9 4.2 2.5 2.8 .9 1.0 .7 .7 1.4 1.4 1.4 0.6 .6 22 20 1.0 1.0 2.9 4.8 57 36 12 6.3 4.0 1.4 1.4 12 17 50 18 2.2 1.6 1.4 1.3 9.8 11 23 4.5 1.7 1.5 2.2 2.5 2 . . 2 3 2.8 4 1.5 5 1.5 6 .8 7 3.1 8.. 1.0 9 1.0 10 1.0 11 1.0 12 .9 13 .9 14 .9 15 1.3 16 1.3 17 1.3 18 . . 1.0 19 2 5 20 2.0 21 16 22 . . 55 23 29 24 3.4 25 2.4 26 14 27 2.5 28 2.0 29 2.4 30 3.1 31 2.3 1913. 1 2.0 2 . . .. 1.7 3 1.2 4 24 5 4.0 6 2.9 7 2.3 8 2.1 9 2.0 10 1.7 11 1.4 12 . .. 1.5 13 1.6 14 1.6 15 1.6 16 1.6 1.6 18 12 19 2.4 2C 1.6 21 1.5 22 1.5 23 1.5 24 1.5 25 1.5 26 1.5 27 1.5 28 1.4 29 1.4 30 1.4 31 1.4 124 ' WATER EESOUECES OF HAWAII, 1913. Monthly discharge of Lahainaluna Stream near Lahaina, Maui, for 1912-13. Month. Discharge in second-feet. Maximum. Minimum. Mean. . Run-off (total in acre-feet). Accu- racy. 1912 January February March April May June July August September October November December The year 1913. January February March April May June July August September October November December The year 2.3 124 22 46 19 10 7.6 8.0 16 78 132 55 132 1.2 1.2 1.0 1.5 1.3 1.1 1.0 .5 .5 .5 .6 1.1 1.3 1.2 1.3 1.3 1.4 1.5 .6 1.2 1.57 13.4 3.36 7.23 2.88 2.09 1.74 1.66 2.21 4.32 6.50 5.24 4.31 2.16 2.60 2.17 13.1 3.44 3.82 4.61 3.93 2.06 3.31 10.9 2.80 771 207 430 177 124 107 102 132 266 387 322 3,120 133 145 133 778 212 227 283 242 123 204 649 172 4.56 2,070 LAHAINALUNA DITCH NEAR LAHAINA, MAUI. Location. — One and one-half miles east of Lahaina, 200 feet above intake for Lahai- naluna School power house. Records available. — ^May 6 to December 31, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made by wading. Diversions. — Ditch diverts nearly all low-water flow from Lahainaluna Stream. Accuracy. — Records good. Discharge measurements of Lahainaluna ditch near Lahaina, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. May 7., May 12. Aug. 19 Gage height. Feet. 0.80 .77 Discharge, Sec.-ft. 2.85 3.31 2.04 Date. Sept. 30. Oct. 3... Gage height. Feet. 0.72 .76 Dis- charge. Sec.-ft. 1.92 1.98 ISLAND OF MAUI. 125 Daily discharge, in second-feet, of Lahainaluna ditch near Lahainxi, Maui, for 1913. Day. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 2.7 2.7 3.0 2.7 2.9 3.2 4.3 4.6 5.4 5.5 4.3 4.3 5.4 4.0 4.0 3.6 2.9 2.9 2.9 2.9 2.9 2.7 3.0 3.4 4.0 4.6 4.3 5.7 4.0 4.9 5.2 5.4 4.3 4.6 5.5 4.9 4.0 2.9 2.6 2.4 2.4 4.0 4.6 4.3 3.2 2.9 2.7 2.6 2.7 3.4 2.9 3.6 3.7 3.4 2.7 2.2 2.1 2.5 2.7 2.6 2.6 2.6 2.7 2.4 2.4 2.4 4.0 4.3 4.0 3.2 4.0 2.9 7.4 4.9 5.2 5.0 5.8 2.9 2.9 2.4 2.4 2.2 2.1 2.0 3.0 2.1 2.4 2.6 2.6 2.9 2.1 4.8 2.9 2.6 2.9 1.9 2.1 2.1 2.1 2.0 2.0 2.4 3.2 3.2 3.3 2.9 2.4 3.4 5.5 6.8 4.6 3.7 2.9 1.9 1.9 2.1 1.8 1.9 2.0 1.9 2.1 1.6 2.1 1.5 1.6 2.1 1.6 4.9 3.7 6.1 3.6 3.2 3.4 2.9 4.8 4.0 2.1 2.6 2.4 2.1 2.0 2.1 1.5 1.4 1.4 2.0 4.0 3.4 2.2 2.1 1.6 1.6 2.1 1.9 2.0 6.3 5.2 2.6 2.5 1.9 6.1 7.1 4.0 4.0 2.6 1.4 2.4 2.1 7.4 8.3 10 9.7 6.0 6.1 5.2 4.6 7.1 8.0 8.5 7.1 3.4 2.9 3.2 2.6 2 ... 2 6 3 2.9 4 8.1 5 6.8 6 2.1 2.6 2.9 2.6 2.9 2.9 6.1 4.6 5.8 3.2 2.1 1.9 2.6 2.4 2.0 2.5 2.4 2.4 2.9 3.2 3.7 3.4 3.2 3.2 2.9 2.9 5.2 7 3.4 8 2.4 9.. 2.4 10 2.4 11 2.9 12 . 2.5 2.5 14 . 2.6 15 2.9 16 2.6 17 2.7 18 6.1 19 4.3 20 . 2.6 21 ; 2.6 22 2.7 23 2.6 24 2.9 2.6 26 '>5 27 2.6 28 2.6 29 . . 2.6 30 2.6 31 2.6 Monthly discharge of Lahainaluna ditch near Lahaina, Maui, for 1913. Month. Discharge in second-feet. Run-o£E (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. May 6.1 5.7 5.5 7.4 6.8 4.9 10 8.1 1.9 2.7 2.1 2.0 1.6 1.4 1.4 2.4 3.05 3.79 3.41 3.31 2.74 2.65 4.99 3.21 157 226 210 204 163 163 297 197 A. A. July A. A. September A. A. November A. December , . . . A. 1,620 126 WATER EESOUECES OF HAWAII^ 1913. KAUATJLA DITCH NEAR LAHAINA, MAUI. Location. — ^About 100 feet below intake which is uppermost on the stream, about 3 miles east of Lahaina. Records available. — October 16, 1911, to December 31, 1913. Gage. — Vertical staff. Discharge measurements. — Made in flume at gage. Control. — Probably permanent. Diversion. — Ditch diverts all low flow of Kauaula Stream. Accuracy. — Records good. Cooperation. — Station is maintained in cooperation with Pioneer Mill Co. Discharge measurements of Kauaula ditch near Lahaina, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Apr. 15. 29. height. Feet: 1.26 .92 Dis- charge. Sec.-ft. 14.7 10.5 Date. Aug. 19. height. Feet. 0.84 Dis- charge. Sec.-ft. 7.S Daily discharge, in second-feet, of Kauaula ditch near Lahaina, Maui, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 7.5 7.5 8.2 7.5 6.8 6.8 6.4 6.4 6.4 6.4 6.0 6.0 11.9 12.8 14.6 11.9 9.9 8.9 8.7 8.7 8.7 7.8 7.5 7.2 6.8 6.4 6.3 6.3 6.0 6.0 6.0 6.3 6.0 6.0 5.6 5.6 5.6 6.0 11.9 9.2 7.5 7.5 6.8 6.4 6.4 6.0 6.0 6.3 7.0 15.5 8.0 8.4 7.0 6.8 6.8 12.8 8.9 6.3 6.0 6.8 6.6 6.0 6.0 6.0 6.0 6.0 5.6 5.4 5.3 5.2 5.0 4.9 4.9 6.0 7.8 6.0 6.0 6.3 6.8 6.8 8.4 6.4 6.3 6.0 6.0 6.0 6.4 6.0 5.6 12.8 7.5 6.8 6.0 6.0 4.6 4.6 5.0 5.0 6.0 5.3 18.2 18.2 18.2 11.0 18.2 18.2 18.2 18.2 14.6 12.3 11.0 11.0 14.6 11.0 13.7 13.7 11.9 9.2 9.2 8.7 8.2 9.2 9.2 7.8 7.5 7.5 7.5 6.8 6.4 6.4 6.4 8.0 15.5 12.8 12.8 12.8 18.4 12.8 12.6 11.0 12.3 11.0 10.6 10.1 9.2 8.4 8.4 7.5 7.5 7.2 6.8 6.8 6.4 6.4 6.4 6.0 6.3 6.0 6.0 9.2 11.0 7.5 8.4 10.1 8.4 7.5 9.2 7.4 6.8 6.4 6.3 6.2 6.0 6.0 5.9 6.7 5.7 5.6 6.9 18.2 13.7 15.0 12.8 12.1 11.4 15.5 9.2 11.0 9.2 8.5 8.2 7.8 7.8 9.9 7.8 7.5 7.4 7.0 7.0 6.9 6.9 7.0 7.0 7.0 7.2 7.2 7.0 6.9 6.9 6.9 6.9 6.8 6.8 6.8 6.8 6.8 6.8 6.9 6.8 6.8 6.8 6.8 6.8 15.5 12.8 8.9 9.6 13.2 11.0 9.0 8.7 8.4 8.4 8.2 8.2 7.8 7.4 7.4 7.4 7.2 7.2 7.2 8.7 7.8 7.7 7.7 7.5 7.2 6.9 6.6 6.6 6.6 6.6 6.6 6.6 6.4 6.4 6.3 6.6 8.2 12.4 8.9 7.5 7.2 7.0 7.5 7.4 7.0 6.9 6.9 6.8 6.6 6.4 5.9 5.7 5.7 5.7 5.7 13.7 8.0 12.8 7.8 7.2 ■ 6.9 6.4 11.0 14.2 7.8 8.0 6.8 6.6 6.4 5.9 5.7 5.6 5.6 5.6 9.9 5.9 5.9 5.9 5.7 5.7 5.7 5.4 5.4 15.0 12.8 8.0 8.0 6.3 16.0 16.4 14.6 14.6 13.7 12.8 12.4 12.3 13.2 15.0 15.0 "'l'.h' 11.9 11.6 11.0 13.2 15,5 15.5 13.7 13.3 12.8 11.9 10.8 2 10.5 3 9.9 4 16.4 5 15.5 6 14.6 7 13.2 8 12.1 9 11.4 10 10.1 11 8.9 12 8.4 13 8.0 14 8.4 15 7.8 16 7.8 17 7.8 18 13.7 19 11.4 20 8.0 21 7.8 22 7.5 23 7.2 24 7.2 25 7.0 26 7.0 27 6.9 28 6.8 29 6.6 30 6.4 31 6.4 Note.— No discharge Nov. 19. ISLAND OF MAUI. Monthly discharge of Kauaula ditch near Lahaina, Maui, for 1913. 127 Month. Dischaxge in second-feet. Maximiani. Minimum. Mean Rxm-off (total in acre-feet). Accu- racy. January February March April May June July August September October November^ December The year 14.6 15.5 12.8 18.2 15.5 18.2 15.5 15.5 12.4 14.2 16.4 16.4 6.0 5.6 4.9 4.6 6.4 5.6 6.8 6.8 6.3 5.6 4.6 6.4 7.88 7.45 6.27 11.2 9.47 7.61 8.57 8.29 7.23 7.27 11.7 9.40 485 414 386 666 582 453 527 510 430 447 696 578 IS. 2 8.53 6,170 a Ditch was dry Nov. 19. Mean is for 29 days. LAIINIUPOKO STREAM NEAR LAHAINA, MAUI. Location. — ^About 175 feet above Pioneer Mill Co.'s ditch intake, 1 mile above storage reservoir, and about b\ miles southeast of Lahaina. Records available. — July 25, 1911, to December 31, 1913. Gage. — ^Vertical staff. Control. — ^Probably shifting. Discharge measurements. — ^Made by wading. Diversions. — None above station. Accuracy. — Records poor. Cooperation. — Station maintained in cooperation with Pioneer Mill Co. Discharge measurements of Launiupoko Stream near Lahaina, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Gage height. Dis- charge. Apr. 17 Feet. 0.84 .45 Sec.-ft. 6.05 Aug. 20 .94 Monthly discharge of Launiupoho Stream near Lahaina, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-off (total ui acre-feet). Accu- racy. January February March April May Jime July August September October November December The year 5.5 3.9 1.4 12 25 2.8 2.0 5.5 1.5 3.6 6.9 6.7 0.8 1.11 1.16 .83 2.86 2.99 1.02 .92 1.14 .82 1.06 2.12 1.08 68.2 64.4 51.0 170 184 60.7 56.6 70.1 48.8 65.2 126 66.4 1.43 1,030 128 WATER EESOURCES OP HAWAII, 1913. OLOWALU STREAM NEAR GLOW ALU, MAUI. Location. — About 600 feet above Olowalu Sugar Co.'s power house, about 1 mile north of Olowalu. Record available. — April 26 to December 31, 1913. Gage. — Vertical staff. Control. — Fairly permanent. Discharge measurements. — Made from footbridge or by wading. Diversions. — Water for power house diverted about 1| miles above gage; measured in tailrace called Olowalu ditch No. 1. Accuracy. — Records fair. Cooperation. — Station maintained in cooperation with Olowalu Sugar Co. Discharge measurements of Olowalu Stream near Olowalu, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Apr. 26 . May 15. height. Feet. 0.83 1.77 Dis- charge. Sec.-ft. 3.44 55.8 Date. Aug. 20. height. Feet. 0.50 Dis- charge. Sec.-ft. 0.10 Daily discharge, in second-feet, of Olowalu Stream near Olowalu, Maui, for 1913. Day. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec, 1 0.4 1.6 .4 .4 .2 0.4 .3 2.6 .4 .2 21 11 25 11 1.9 7.6 2.9 2.4 1.9 1.9 .3 0.2 .3 1 2 2 .4 3 32 18 6.3 .1 3 4 84 5 34 6 29 7 .2 .3 8.0 .3 4.0 .2 19 8 42 102 60 35 29 28 15 2.7 .3 5.3 16 40 38 7.6 2.4 .4 1.9 28 50 18 7.0 2.3 4.5 12 9 10 10 7 6 11 6 6 12 46 37 134 86 36 24 21 16 13 11 9.0 5.3 7.0 69 1.2 '167"" 5.3 1.8 .2 28 .5 2.6 7.3 11 18 4.5 5.6 77 13 39 1.1 .2 .2 .2 .2 .2 .2 .2 1.0 5 6 13 7.0 7.0 2.6 .4 .8 .2 2.4 .2 18 1.6 .1 5.0 14 5.6 15 .9 16 .2 17 1 18 4.0 12 19 3 20 .2 21 .1 22 7.0 1.1 .2 23 24 25 26 2.9 5.1 1.6 1.1 .6 27 5.6 5.9 126 11 28 29 30 31 Note.— No discharge for days for which figures are not given; water diverted above station at power house. ISLAND OF MAUI. 129 Monthly discharge of Olowalu Stream near Olowalu, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. April 27-30 . May , Jime July August September. October November. . December.. 5.1 134 126 25 77 4.0 7.0 102 84 (a) (a) (a) (a) (a) (a) (a) (a) 0.6 2.26 20.4 6:19 3.38 6.77 .15 .32 19.7 7.55 22.4 1,250 368 19. 1,170 464 The period . 3,930 o Stream dry. OLOWALU DITCH NO. 1 NEAR OLOWALU, MAUI. Location.— One mile above Olowalu, near Olowalu plantation power house, and about 7 miles east of Lahaina. Records available. — August 12, 1911, to December 31, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made in flume. Accuracy. — Records good. Cooperation. — Station maintained in cooperation with Olowalu Sugar Co. Discharge measurements of Olowalu ditch No. 1 near Olowalu, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Gage height. Dis- charge. Apr. 16.. Aug. 20. Feet. 0.38 Sec.-ft. 5.31 8.04 97764°— wsp 373—15- 130 WATER RESOURCES OF HAWAH^ 1913. Daily discharge, in second-feet, ofOlowalu ditch No. 1 near Olowalu, Maui, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. 4.5 4.5 5.5 6.0 8.0 4.5 10 5.0 4.5 3.9 3.9 4.5 4.0 5.5 5.5 . 8.5 4.5 10 4.5 4.5 4.0 4.0 4.5 4.0 5.0 5.0 8.0 5.5 10 4.5 4.5 4.0 4.8 4.0 4.0 4.5 4.0 8.0 4.5 8.5 4.5 4.5 4.0 5.5 4.5 4.0 4.5 4.0 7.0 4.5 8.0 4.5 4.5 4.0 4.8 4.5 6.0 4.5 4.0 6.0 4.5 7.5 4.5 4.5 4.9 4.8 4.5 8.0 4.5 4.0 6.0 4.5 5.5 4.5 4.5 4.0 4.8 4.5 5.5 4.5 4.0 5.5 4.5 5.5 4.5 4.0 5.5 8.0 4.5 4.0 4.5 4.0 5.5 4.5 5.5 4.5 4.0 4.3 4.8 4.5 4.5 4.0 4.5 5.5 4.5 5.5 5.0 4.0 4.0 3.8 4.0 5.0 4.0 9.5 6.0 4.0 5.5 4.5 4.0 3.9 3.8 4.0 4.5 4.0 4.5 5.5 4.5 7.0 6.0 4.0 3.8 3.0 10 4.5 4.0 4.5 10 5.5 8.0 4.5 4.0 6.5 4.0 7.5 4.5 6.0 9.5 8.0 4.5 8.0 8.0 4.0 8.0 4.0 4.5 4.5 6.0 11 4.5 5.0 7.0 8.0 4.0 5.2 6.0 5.0 4.5 7.5 6.0 7.0 4.5 7.0 8.0 4.0 4.3 9.5 4.5 4.5 7.5 4.5 10 4.5 5.5 7.5 5.0 4.0 11 4.0 5.5 5.5 4.0 9.5 4.0 5.5 8.0 8.0 4.0 11 4.0 8.0 5.0 6.0 9.0 4.0 6.0 8.0 6.0 4.0 11 3.5 7.0 4.5 11 6.0 4.0 7.5 7.5 5.0 3.9 9.5 3.0 5.5 5.0 11 5.5 4.0 7.0 7.0 4.5 3.8 11 4.5 4.5 7.5 7.5 5.5 4.0 5.5 7.0 4.5 4.0 11 4.5 4.0 6.0 5.0 5.5 4.5 6.0 6.0 4.5 6.8 11 4.5 3.5 5.0 6.0 5.5 5.5 6.0 5.5 4.0 7.5 11 4.5 7.0 5.0 8.0 5.5 5.5 5.5 5.5 4.0 6.0 13 4.0 5.0 4.5 8.5 5.5 5.5 5.5 5.0 4.0 5.5 13 4.0 4.0 5.0 8.5 5.0 8.0 5.5 5.0 4.0 5.2 12 4.0 4.5 6.0 8.5 5.5 8.5 5.5 4.5 4.0 5.2 11 4.0 4.5 8.0 5.5 9.5 5.0 4.5 4.0 5.2 11 4.0 5.0 8.0 5.0 9.5 4.5 4.5 4.0 4.8 11 4.5 8.0 5.0 4.5 7.0 5.5 Dec. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 11 11 11 15 13 11 11 9.5 7.5 6.8 5.5 5.5 4.9 5.2 5.8 7.5 8.0 11 8.0 8.0 8.0 6.8 6.8 6.0 5.5 5.5 5.5 5.5 5.5 5.4 5.2 Monthly discharge ofOlowalu ditch No. 1 near Olowalu, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-off (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 10 8.0 8.0 11 10 9.5 10 8.0 8.0 8.0 13 15 15 3.0 3.5 4.0 4.0 4.5 4.0 4.5 4.5 4.0 3.8 3.0 4.9 4.55 4.96 5.24 6.48 6.53 5.17 6.56 5.73 4.43 4.85 7.90 7.80 5.8 280 275 322 386 402 308 403 352 264 298 470 4,240 ISLAND OF MAUI. 131 WAIKAPU STREAM NEAR WAIKAPU, MAUI. Location. — One and one-half miles west of Waikapu and about 5 miles southwest of Wailuku; 500 feet below intake of Palolo ditch. Records available. — December 1, 1910, to December 31, 1913. Gage. — Inclined staff. Control. — Shifting. Discharge measurements. — ^Made by wading. Diversions. — Most of the normal flow diverted into the South Side Waikapu and the Palolo ditches. Accuracy. — Records poor on account of insuflficient rating. The following discharge measurement was made by C. T. Bailey: May 27, 1913: Gage height, 0.34 foot; discharge, 0.20 second-foot. Monthly discharge of Waikapu Stream near Waikapu, Maui, for 1913. Month. Discharge in second-feet. Run-oS (total in Maximum. Minimum. Mean. acre-feet). 0.3 0.2 0.20 12.3 50 .2 4.70 261 .3 .2 .21 12.9 81 .2 10.3 613 181 .2 8.94 550 27 .2 1.60 95.0 6.0 .2 .53 32.6 25 .2 3.05 188 .8 .2 .22 13.1 1.0 .2 .25 15.4 149 .2 9.30 553 178 .2 13.6 836 181 .2 4.40 3,180 Accu- racy. January February March April May June July August September October November December The year SOUTH SIDE WAIKAPU DITCH NEAR WAIKAPU, MAUI. Location. — One mile below ditch intake, 1| miles west of Waikapu, and about 5^ miles southwest of Wailuku. Records available. — November 21, 1910, to December 31, 1913. Gage. — Vertical staff. Control. — Fairly permanent. Discharge measurements. — Made from plank over ditch about 400 feet below gage. Accuracy. — Records good. Discharge measurements of South Side Waikapu ditch near Waikapu, Maui, in 1913. [C. T. Bailey, hydrographer.] Date. Apr. 9. May 27. Gage height. Feet. 0.57 .73 Dis- charge. ■..-ft. 3.47 6.29 Date. July 29. Nov. 5. Gage height. Feet. 0.00 .66 Dis- charge. Scc.-ft. 3. 78 4.86 132 WATER EESOUECES OF HAWAII^ 1913. Daily discharge, in second-feet, of South Side Waikapu ditch near WaiJcapu, Maui, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1. 3.5 4.1 4.5 3.9 3.5 3.1 3.1 2.9 2.8 2.8 2.8 2.8 4.1 4.5 4.5 3.5 3.1 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 3.5 2.8 2.8 2.8 2.8 2.8 10.1 5.9 11.0 7.1 5.0 5.1 4.2 3.5 3.5 3.5 3.6 3.5 10.4 6.5 9.0 6.5 5.7 5.6 4.2 7.6 7.3 5.7 5.6 4.8 4.2 4.2 4.1 3.9 3.9 4.2 4.2 3.9 3.9 3.9 3.9 3.9 3.9 4.4 4.5 5.1 4.4 4.1 3.6 3.5 5.1 4.2 3.9 3.9 3.6 3.5 5.0 4.1 3.5 5.0 4.2 4.1 3.9 3.6 3.5 *3.5 3.5 3.5 3.5 3.9 8.3 11.0 11.3 10.6 13.7 12.2 11.9 10.8 8.7 7.3 8.5 8.2 7.8 7.6 7.3 6.2 6.3 5.7 5.7 5.9 5.7 8.8 6.8 7.0 7.6 8.2 8.5 8.3 8.5 8.3 8.2 12.6 10.6 11.0 S.O 6.7 8.7 9.0 9.0 7.8 7.1 7.0 6.5 6.0 6.0 8.8 6.8 6.3 6.0 5.9 5.7 6.0 6.0 6.2 6.0 6.0 6.0 5.9 6.3 6.0 6.7 6.3 8.0 6.8 6.0 7.6 6.2 5.7 5.6 5.1 4.5 4.2 4.1 4.1 4.1 4.2 3.9 11.2 9.4 8.8 9.4 9.0 9.4 7.5 6.7 5.7 5.9 6.7 5.7 5.1 4.5 4.2 7.0 6.2 5.7 5.4 5.2 5.2 5.2 5.2 5.4 5.1 4.5 5.1 5.1 5.7 4.8 4.5 3.9 3.9 4.5 4.2 4.2 4.8 4.2 4.2 4.2 4.1 3.9 3.8 3.9 7.0 4.5 10.8 8.7 6.0 6.3 10.1 8.3 6.2 5.1 5.4 5.7 4.8 5.1 5.1 5.4 5.1 6.2 6.0 5.4 5.4 9.9 6.0 6.0 5.7 5.4 5.4 5.0 5.7 4.2 4.2 3.9 4.4 3.9 4.6 3.9 3.8 4.2 4.4 7.6 5.1 4.2 4.4 3.9 3.9 3.6 3.5 3.5 3.5 3.5 3.4 3.4 3.4 3.4 3.1 3.4 3.1 3.6 3.2 4.4 3.4 3.1 2.8 2.8 3.9 2.9 3.1 2.9 2.9 2.8 2.8 2.8 2.7 2.7 2.7 2.7 2.8 2.7 2.7 2.8 3.0 3.1 2.9 2.9 3.1 10.4 9.0 5.4 4.2 3.8 17.3 15.7 10.8 8.3 7.1 7.1 6.0 5.2 6.3 7.3 11.2 13.2 8.3 7.0 5.7 6.3 8.3 9.4 12.6 8.3 6.8 5.7 8.3 6 2 6.0 3 5.6 4. 14.5 5 8.5 6 6.0 7 4.0 8 4.2 9 .6 10 7.3 11 6.7 12 6.2 13 5.8 5.4 15 4.5 16 4.2 17 4.6 18 5.1 19 4.2 20. . . .. 3.9 21 3.8 22 2.8 23 2.8 24 2.8 25 2.8 26 2.8 27 2.7 28 2.7 29 2.7 30 2.5 31 2.5 Monthly discharge of South Side Waikapu ditch near Waikapu, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean- Run-ofl (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 4.5 11.0 6.1 13.7 12.6 11.2 9.4 10.8 7.6 4.4 17.3 14.5 17.3 2.8 2.8 3. 3.5 5.7 3.9 3.9 3.8 3.4 2.7 2.9 3.21 5.50 4.14 7.07 7.79 6.21 5.55 5.80 4.47 3.05 8.03 4.67 5.45 197 305 255 421 479 370 341 357 266 187 478 287 3,940 PALOLO DITCH NEAR WAIKAPU, MAUI. Location. — Two hundred feet below ditch intake, IJ miles west of Waikapu, and about 5^ miles southwest of Wailuku. Records available. — November 21, 1910, to December 31, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made by wading. Accuracy. — Records good. ISLAND OF MAUI. 133 Discharge measurements of Palolo ditch near Waihapu, Maui, in 191S. [C. T. Bailey, hydrographer.] Date. Gage height. Apr. 9. May 27. Feet. 0.81 Dis- Sec.-ft. 2.61 2.83 Date. July 29. Gage height. Feet. 0.80 Dis- Sec.-ft. 2.24 Daily discharge, in second-feet, of Palolo ditch near Waihapu, Maui, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 2.. 2.8 2.9 3.1 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.1 3.4 3.2 3.0 3.0 3.0 2.9 2.8 2.9 2.8 2.8 2.8 2.8 2.6 2.6 2.6 2.6 2.6 2.8 2.8 2.6 2.6 2.6 2.6 4.3 3.5 4.5 3.4 2.8 2.8 2.6 2.6 2.6 2.5 2.6 2.9 3.4 3.4 3.4 3.2 3.1 3.0 2.8 3.4 3.2 3.0 2.8 2.8 2.8 2.6 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.8 2.8 2.6 2.5 2.5 2.5 2.5 2.8 2.6 2.5 2.5 2.5 2.5 2.8 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.6 4.8 3.9 3.8 3.8 3.9 3.9 3.9 3.8 3.4 3.1 3.4 3.1 3.0 2.6 2.6 2.5 2.5 2.4 2.4 2.4 2.4 3.1 2.8 2.6 2.5 2.4 2.5 2.4 2.4 2.4 2.4 3.5 3.1 3.6 3.6 3.4 3.3 3.2 3.3 3.0 2.9 2.9 2.6 2.6 2.6 3.1 2.8 2.6 2.5 2.5 2.5 2.6 2.7 2.8 2.6 2.6 2.6 2.6 2.6 3.0 3.3 3.0 3.1 2.9 2.7 3.0 2.9 2.6 2.5 2.5 2.5 2.5 2.5 2.5 2.4 2.5 2.4 3.8 3.6 3.3 3.4 3.2 3.4 3.1 2.9 2.6 2.8 3.0 2.6 2.6 2.6 2.5 3.4 3.0 2.8 2.6 2.5 2.5 2.5 2.5 2.7 2.5 2.5 2.6 2.5 2.6 2.6 2.5 2.5 2.5 2.6 2.5 2.4 2.6 2.5 2.5 2.5 2.4 2.4 2.4 2.4 3.7 2.6 3.9 3.4 2.6 2.7 4.2 3.5 2.8 2.6 2.6 2.6 2.5 2.6 2.6 2.6 2.5 2.8 2.6 2.5 2.5 4.0 2.6 2.5 2.6 2.5 2.5 2.5 2.8 2.5 2.5 2.4 2.5 2.4 2.6 2.4 2.4 2.5 2.5 2.9 2.6 2.5 2.5 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.5 2.4 2.5 2.4 2.4 2.4 2.4 2.5 2.6 2.6 2.5 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.5 2.4 2.4 2.9 3.3 2.5 2.4 2.4 2.5 2.5 2.8 2.5 2.4 2.4 5.2 3.8 3.0 2.9 2.8 2.8 2.6 2.5 2.6 2.9 3.1 3.3 2.9 2.6 2.6 2.6 2.6 2.8 3.5 2.8 2.5 2.5 2.8 2.6 2.6 3 2.5 4 5 3.5 2.8 6 7 8 2.9 6.0 5.9 9 2.7 10 3.4 11 12 13 1.4 2.3 2.0 14 2.2 15 2.0 16 17 18 19 2.0 2.0 2.1 2.3 20 2.4 21 22.. 2.4 2.5 23 2.5 24 2.5 25 2.5 26 27 2.5 2.5 28 2.5 29 2.6 30 2.6 31.. 2.6 Monthly discharge of Palolo ditch near Wailulcu, Maui, for 1913. Month. Discharge in second-feet. Run-off (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. 3.4 4.5 2.8 4.8 3.6 3.8 3.4 4.2 2.9 3.3 5.2 6.0 2.6 2.5 2.5 2.4 2.4 2.4 2.5 2.4 2.4 2.4 2.4 1.4 2.91 3.04 2.57 3.01 2.81 2.79 2.70 2.78 2.49 2.48 2.87 2.69 179 169 158 179 173 166 166 171 148 152 171 165 A. Fehruary A. A. April A. A. June A. July A. August A. September A. October A. November A. A. The year 6.0 1.4 2.76 2,000 134 WATEK EESOUECES OF HAWAII, 1913. HAIPUAENA STREAM NEAR HUELO, MAUI (OLD STATION). Location. — About 7 miles by trail east of Huelo post ofl&ce, about 400 feet below point where Spreckels ditch joins the stream. Records available. — December 18, 1910, to September 30, 1913. Gage. — Vertical staff. Control. — Shifting. Discharge measurements. — Made by wading. Diversions. — Combined flow of stream and Spreckels ditch was measured. Accuracy. — Poor . Cooperation. — Station is maintained in cooperation with East Maui Ditch Co. Monthly discharge of Haipuaena Stream near Huelo, Maui, for 1913. [Old station.] Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-ofi (total in acre-feet). Accu- racy. January.. - February. . March April May June July August September. 100 65 136 79 72 56 9.0 8.5 4.5 14 14 10 7.0 5.5 8.0 27.7 20.6 19.4 46.8 23.8 24.6 24.7 25.2 17.8 1,700 1,140 1,190 2,780 1,460 1,460 1,520 1,550 1,060 The period . 13,900 HAIPUAENA STREAM NEAR HUELO, MAUI (nEW STATION). Location. — Seven miles east of Huelo post office, 200 feet above Spreckels ditch inflow. Records available. — October 19 to December 31, 1913. Gage. — Friez water-stage recorder. Control. — Probably permanent. Discharge measurements.— Made from footbridge or by wading. Diversions.— None above station. Accuracy. — Records very good. Discharge measurements of IIaipv£no Stream near Huelo, Maui, in 1913. [New station.] Date. Made by— Gage height. Discharge. Date. Made by— Gage height. Dis- charge. Oct. 27... Nov. 4. E. 0. Christiansen, do Feet. 0.42 1.38 2.46 Sec.-ft. 2.77 33.6 141 Nov. 12. Nov. 13. C. T. Bailey do Feet. 2.10 1.01 2.72 Sec.-ft. 81.0 14.9 Nov. 8. . . . .do Nov. 18. .do 161 ISLAND OF MATJI. 185 Daily discharge, in second-feet, of Eaipuaena Stream near Huelo, Maui, for 1913. Day. Oct. Nov. Dec. Day. Oct. Nov. Dec. Day. Oct. Nov. Dec. 1 4 15 71 32 10 7 14 100 150 62 7 7 11 174 85 61 17 20 13 9 11 28 68 19 11 14 28 41 138 136 52 8 8 14 37 23 12 18 33 11 8 21 4 4 3 3 3 3 3 3 3 3 3 39 27 15 83 31 42 21 12 10 8 7 2 12 22 6 3 13 23 6 4 14 24 5 5 15 25 5 6 16 26 5 7 17 27 4 8 18 28 4 9 19 20 4 4 29 4 10 30 4 31 4 Note. — Discharge interpolated Nov. 16 and 22. Monthly discharge of Haipuaena Streain near Huelo, Maui, for 1913. Month. Discharge in second-feet. Maximum. Mtoimuni. Mean. Run-ofi (total in. acre-feet). Accu- racy. October 19-31 November December 4 150 174 3.3 42.6 20.3 85 2,530 1,250 PUOHAKAMOA STREAM NEAR HUELO, MAUI (OLD STATION). Location. — About 6 miles by trail east of Hueio post office, immediately below point wliere Spreckels ditch falls into stream . Records available. — December 18, 1910, to June 18, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made by wading. Diversions. — ^Measurement made of combined flow of stream and Spreckels ditch. Accuracy. — Records poor. Cooperation. — Station maintained in cooperation with East Maui Ditch Co. Monthly discharge of Puohakamoa Stream near Huelo, Maui, for 1913. [Old station.] January.. February. March AprU May June 1-18. Month. The period. Discharge in second-feet. Maximum. Miaimum 106 169 489 209 177 100 Mean. 38.7 35.0 39.1 77.7 36.9 34.3 Run-off (total in acre-feet). 2,380 1,940 2,400 4,620 2,270 1,220 14,800 Accu- racy. 136 WATER EESOUECES OF HAWAII^ 1913. PUOHAKAMOA STREAM NEAR HUELO, MAUI (nEW STATION). Location. — Seven miles east of Huelo post office, 150 feet above Spreckels ditcli trail. Records available. — June 13 to December 31, 1913. Gage. — Barrett & Lawrence water-stage recorder. Control. — Fairly permanent. Discharge measurements. — Made from trail bridge or by wading. Diversions.— Kula pipe line diverts water at an elevation of 4,300 feet. Accuracy.— Low-water records good; records for high stages only approximate. Discharge measurements of Puohahamoa Stream near Huelo, Maui, in 1913. [New station.] Date. Made by— Gage height. Dis- charge. Date. Made by— Gage height. Dis- charge. June 19.. Oct. 27... C. T.Bailey E. 0. Christiansen. . Feet. 1.26 .94 Sec.-ft. 7.70 6.49 Nov. 12 . Nov. 13. C.T.Bailey do Feet. 3.18 2.40 Sec.-ft. 130 37.6 a Discharge is the diflerence between measured discharge of Spreckels ditch above and below Puoha- kamoa Stream. Daily discharge, in second-feet, of Puohahamoa Stream near Huelo, Maui, for 1913. [New station.] Day. June. July. Aug. Sept. Oct. Nov. Dec. 1 11 43 21 20 38 52 21 16 12 10 10 11 11 U 10 9.0 8.7 8.0 7.6 7.8 8.1 7.4 7.2 7.2 7.2 7.2 7.2 7.0 6.8 6.6 6.5 6.2 6.2 6.1 6.8 5.8 7.1 40 8.4 7.4 7.4 74 76 17 15 15 12 9.7 8.6 8.1 7.8 7.6 7.2 7.0 7.0 6.8 6.8 6.9 7.3 7.0 16 8.8 '"n" 24 22 10 8.7 7.8 7.4 7.0 6.7 6.5 6.5 6.5 6.4 6.1 6.5 6.0 5.8 6.2 6.2 15 27 37 12 8.5 8.2 7.6 17 11 9.1 8.0 7.4 7.2 7.0 6.8 6.9 6.6 6.4 6.3 6.2 6.2 6.2 6.2 6.1 6.0 6.0 6.6 15 128 68 16 11 13 226 305 153 79 129 47 22 20 66 100 267 233 92 68 28 31 173 91 114 57 26 21 16 14 2 .... 12 3 16 4 366 5 178 6 147 7 55 8 . 61 9 34 10 21 11 17 12 .J 16 13 14 53 24 16 10 8.7 8.1 7.8 7.4 7.1 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7 9.5 15 79 15 ; . . . 62 16 17 26 37 18 91 19 23 20 17 21 14 22 13 23 12 24 11 25 10 26 9 7 27 9.3 28 8.9 29 8.7 30 8.1 31.... 7.8 Note. — No record Sept. 1-16; recording instrument out of order. ISLAND OF MAUI. 137 Monthly discharge of Puohakamoa Stream near Huelo, Maui, for 1913. [New station.] Month. Discharge in second-feet. Maximum. Minimum. Mean, Run-off (total in acre-feet). Accu- racy. Juneia-30 July August September 17-30. October November December 53 52 76 24 37 305 366 7.0 6.5 5.8 6.1 5.8 6.6 7.8 11.5 13.4 13.9 9.90 9.31 87.4 45.1 The period. 410 824 855 275 572 5,200 2,770 10,900 ALO STREAM NEAR HUELO, MAUI. Location. — About 5 miles by trail east of Huelo post office, immediately below bridge where old Spreckels ditch, trail crosses stream. Records available. — December 18, 1910, to December 31, 1913. Gage. — Vertical staff. Control. — Affected by backwater from inflow of Spreckels ditch. Discharge raeasirrements. — Made by wading. Diversions. — None above station. Accuracy. — Records poor. Discharge measurements ofAlo Stream near Huelo, Maui, for 1913. [C. T. Bailey, hydrographer.] Date. Gage height. Dis- charge. Date. Gage height. Dis- charge. July 24... . Feet. 1.48 2.58 Sec.-ft. 1.45 31.9 Nov. 20 Feet. 2.11 Sec.-ft. 18.2 Nov.18 Monthly discharge of Alo Stream near Huelo, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 24 61 7.8 51 28 9.4 21 43 11 15 97 110 .5 1.7 1.2 1.2 .7 .5 .7 .4 .7 1.2 4.80 4.72 2.65 11.7 3.56 3.33 3.75 4.30 2.04 2.73 22.8 10.7 110 6.40 295 262 164 696 219 198 231 264 121 168 1,360 658 4,640 138 WATEE EESOUECES OF HAWAII^ 1913. WAIKAMOI STREAM NEAR HUELO, MAUI. Location.— Five hundred feet above Spreckels ditch intake and 5 miles east of Huelo post office. Records available. — December 18, 1910, to December 31, 1913. Gage. — Friez water-stage recorder installed October 14, 1913, at new datum; staff gage December 18, 1910, to October 13, 1913, Control. — Probably permanent. Discharge measurements. — Made from footbridge or by wading. Diversions. — None above station. Accuracy. — Records good. - Discharge measurements of Waihamoi Stream near Huelo, Maui, for 1913. Date. Made by— Gage height. Dis- charge. Date. Made by— Gage height. Dis- charge. July 24. . . Oct. 27a.. C.T.Bailey E.G. Christiansen, do Feet. 1.40 .35 1.49 Sec.-ft. 3.23 2.15 83.9 Nov.8... Nov. 13.. Nov. 2.. E.O.Christiansen. C.T.Bailey do Feet. 1.80 1.03 1.21 Sec-ft. li>3 26.2 53.4 a Water-stage recorder installed at new datum Oct. 14, 1913. Daily discharge, in second-feet, of Waihamoi Stream near Huelo, Maui, for 1913. Day. 1 2 3 4, 5 6 7, 8 9 10 11 12 13 14 15 16 17 18, 19 20 21 22 23 24 25 26 27 28 29 30 31 Jan. 10 8.4 7.8 7.0 6.2 5.7 5.0 8.8 9.0 11 6.4 7.8 22 18 21 14 10 8.4 7.6 6.4 4.0 6.0 11 4.9 4.7 4.4 4.1 3.8 3.3 3.1 3.3 Feb. 4.0 3.8 3.0 2.8 3.6 23 9.2 6.0 4.1 3.6 3.0 2.7 2.4 2.4 2.2 5.7 3.6 18 24 9.2 8.0 7.2 6.0 4.9 4.4 3.8 3.3 2.9 Mar. 2.6 2.4 2.2 2.0 1.8 2.0 3.3 2.6 4.1 2.8 1.9 1.0 5.0 8.0 5.0 5.0 3.6 13 14 7.4 5.7 7.6 5.8 4.9 11 5.8 28 47 Apr. 21 14 8.4 6.8 6.4 5.7 5.0 4.4 6.0 4.7 60 92 43 70 54 71 33 20 15 16 13 17 17 20 12 12 9.6 9.0 7.2 6.8 6.0 7.4 6.8 6.4 5.0 5.0 7.8 5.4 4.7 4.1 5.7 7.8 6.8 13 12 10 9.4 6.0 5.0 5.0 6.0 4.6 13 7.6 7.2 7.6 6.4 8.4 June. 6.5 4.7 4.7 3.0 6.0 4.7 4.6 4.4 6.2 9.6 6.6 15 15 14 12 3.0 6.2 5.4 5.0 4.4 3.8 3.6 3.3 3.1 5.4 5.4 8.8 12 8.2 18 July. 25 40 14 15 18 21 10 9.2 7.4 6.4 6.0 7.0 11 8.8 6.8 6.7 4.9 4.3 3.8 3.6 5.7 3.6 3.3 3.6 3.3 3.6 3.3 2.9 ,2.6 2.5 2.4 Aug. 2.2 1.9 2.0 1.6 1.4 2.7 4.6 9.6 5.4 7.6 6.8 42 16 14 31 11 9.2 7.6 6.8 6.2 5.7 4.6 3.8 3.8 3.1 3.3 6.4 5.6 3.8 3.0 Sept. 5.7 4.7 4.4 3.3 2.8 2.4 2.7 2.6 2.6 2.4 2.0 3.3 3.0 3.3 3.0 3.6 7.8 37 17 10 7.2 5.4 4.1 2.3 1.4 1.2 1.2 1.4 1.2 Oct. 6.2 5.2 4.0 4.2 3.8 4.0 3.2 2.8 2.7 2.5 2.7 2.7 2.7 2.3 2.0 2.1 Nov. 2. 12 163 67 16 12 250 106 36 104 30 18 19 143 108 188 163 58 35 20 22 186 55 64 36 21 17 12 Dec. 11 9.4 12 388 170 143 24 29 18 13 11 10 9.4 62 36 18 24 62 16 14 12 10 9.4 8.5 7.9 7.3 6.8 6.4 6.0 6.6 5.4 Note.— No record Oct. 1-14 and Nov. 7-8. ISLAND OF MAUI. 139 Monthly discharge of Waihamoi Stream near Huelo, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-off (total in Accu- racy. January . . February. March April Time July August September October 15-31 November 1-6, 9-30 December The period . 22 24 47 92 13 18 40 42 37 7.6 250 3.1 2.2 .8 4.4 4.1 3.0 2.4 1.4 .9 2.0 2.8 5.4 8.16 6.31 6.71 24.0 7.25 7.01 8.54 7.66 5.00 3.57 70.1 36.9 502 350 413 1,430 446 417 525 471 298 110 3,890 2,270 11,100 OOPUOLA STREAM NEAE HUELO, MAUI. Location. — About 2 miles by trail east of Huelo post office, about 400 feet above old Spreckels ditch crossing. Records available. — December 16, 1910, to December 31, 1913. Gage. — Vertical staff. Control. — Fairly permanent. Discharge measurements. — Made by wading. Diversions. — None above station. Accuracy. — Records poor on account of only one reading daily. Discharge measurements ofOopuola Stream near Huelo, Maui, for 1913. [C. T. Bailey, hydrographer.] Date. Gage height. Dis- charge. JimelO Feet. 1.01 2.29 Sec.-ft. 0.04 Nov. 12 24.0 140 WATER EESOUECES OF HAWAII, 1913. Daily discharge, in second-feet, of Oopuola Stream near Huelo, Maui, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 .. .. 3.4 5.0 4.8 3.4 2.2 .9 .8 12 8.1 12 12 41 70 30 34 3.9 2.0 5.0 8.5 12 10 1.4 0.8 0.8 .8 .8 .8 .8 .8 .8 .8 .8 .8 .8 .8 .8 .8 .8 1.6 2.3 2.0 1.1 .9 2.4 16 8.4 .9 1.2 1.1 .9 2.5 .9 .8 .7 16 15 1.2 8.1 6.4 3.6 .9 .9 1.0 .8 80 18 18 18 21 30 34 24 22 23 24 44 16 23 30 27 16 4.4 3.9 2.9 1.6 1.2 1.3 1.2 1.1. 1.1 .9 .8 .8 .9 1.1 1.2 1.0 1.0 11 6.4 5.3 4.0 2.7 1.4 1.2 1.1 1.0 1.6 9.8 18 10 .9 .8 .8 .8 0.8 .8 .8 1.3 .8 .8 .8 1.2 1.7 2.2 1.2 3.1 15 1.4 1.2 1.0 .9 .8 .8 .8 .8 .8 .8 .8 .8 .9 2.9 21 21 21 17 21 12 2.2 2.0 1.8 2.0 1.8 1.6 1.2 1.1 .9 1.0 1.2 1.1 1.0 .8 .8 .8 .8 .9 .7 .7 .7 .7 .7 .7 .7 .7 .7 .7 0.6 .6 .6 .6 .6 .7 3.9 1.2 1.0 .9 .8 6.4 6.4 6.7 34 5.3 3.4 1.4 1.2 .9 .9 .8 .8 .8 .7 .7 2.9 .8 .8 .7 .8 0.7 .7 .7 .7 .7 .7 .7 .7 .7 .7 .7 .7 .7 .7 .7 1.2 1.2 11 4.4 1.2 1.0 .8 .7 .7 .7 .7 .7 .7 .7 .7 0.7 .7 .7 .7 1.4 2.2 2.9 27 2.0 .8 .8 1.6 2.4 15 1.6 1.1 1.0 .8 . 7 .7 . 7 .7 .7 .7 .7 .7 .7 .7 .7 .7 .7 0.7 1.9 3.2 11 3.4 2.4 .8 67 42 18 25 27 15 10 8.5 9.2 10 67 12 9.0 18 11 14 16 12 12 14 14 11 7.9 4.8 2 8 8 7 2.0 3 12 4 15 6 32 6 35 2.9 10 5.4 .8 1.1 .9 .9 .9 .9 2.4 3.8 12 21 12 2.0 1.4 3.9 6.4 .8 .8 .8 .8 60 7 . .. 32 8 4.4 9 4.1 10 3.6 11 2.7 12 3.9 13 2.6 14 15 9.3 16 16 18 17 19 18 .. . . 21 19 4.4 20 3.4 21 2.6 22 1.9 23 1 1 2 1 8 8 9 8 8 8 8 1.8 24 1.8 25 1.5 26 1.2 27 1.2 28 1.1 29 1.0 30 .9 31 .9 Note.— Discharge estimated for days (usually Sundays) on which no gage heights were recorded. Monthly discharge of Oopuola Stream near Huelo, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean, Eun-off (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 9.37 4.60 1.80 17.8 2.97 3.61 2.58 2.84 1.23 2.34 15.8 9.24 576 259 111 1,060 183 215 159 175 73 144 937 567 6.15 4,460 ISLAND OP MAUI. 141 SPRECKELS DITCH AT GAGE NO. 1, NEAR HUELO, MAUI. Location. — ^About SJ miles by trail east of Huelo, about 20 feet above bridge wliich crosses ditch in Ulawina Gulch. Records available. — December 18, 1910, to September 30, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — ^Made by wading. Accuracy. — Records good. Cooperation. — Station maintained in cooperation with East Maui Ditch Co. The following discharge measurement was made by C. T. Bailey: June 19, 1913: Gage height, 0.40 foot; discharge, 5.94 second-feet. Monthly discharge of Spreckels ditch at gage No. 1, near Huelo, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-ofl (total in acre-feet). Accu- racy. January . . . February. . March April May June July August September. 4.1 3.6 1.6 6.0 5.5 5.1 3.4 2.4 3.7 13.4 0.1 29.90 5.8 10.1 11.0 13.5 12.0 8.05 The period . 824 561 609 1,540 621 655 830 738 479 6,860 SPRECKELS DITCH AT GAGE NO. 2, NEAR HUELO, MAUI. Location. — ^About 7| miles by trail east of Huelo post office and 100 feet above junction of ditch with Kolea Stream No. 2. Records available.^November 6, 1911, to September 30, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made from log across ditch near gage. Accuracy. — Records good. Cooperation. — Station is maintained in cooperation with East Maui Ditch Co. The following discharge measurement was made by C. T. Bailey: June 19, 1913: Gage height, 0.90 foot; discharge, 6.84 second-feet. Monthly discharge of Spreckels ditch at gage No. 2, near Huelo, Maui, for 1913. ' January . . . February . . March April May June July August September . Month. The period . Discharge in second-feet. Maximum. Minimum. Mean 13.1 8.9 9.3 22.6 10.8 12.9 12.5 12.4 7.5 Run-ofl (total in acre-feet). 494 572 1,340 664 768 769 762 446 6,620 Accu- racy. 142 WATER EESOUECES OP HAWAII, 1913. SPEECKELS DITCH AT GAGE NO. 3, NEAE HtJELO, MAUI. Location. — ^About 6f miles by trail east of Huelo and 400 feet above junction of ditch mth Haipuaena Stream. Records available. — December 18, 1910, to September 30, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made from log near gage. Accuracy. — Records good. Cooperation. — Station maintained in cooperation with East Maui Ditch Co. The following discharge measurement was made by C. T. Bailey: June 19, 1913: Gage height, 1.20 feet; discharge, 9.33 second-feet. % Monthly discharge of Spreckels ditch at gage No. 3, near Huelo, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean, Eun-off (total in acre-feet). Accu- racy. January... February.. March April May June July August September. 7.4 6.0 3.6 8.7 7.9 5.8 5.8 4.6 6.0 18.3 12.9 13.5 27.4 15.7 16.2 17.0 15.7 11.5 The period. 1,120 716 830 1,630 965 964 1,050 965 684 8,920 SPEECKELS DITCH AT GAGE NO. 4, NEAE HUELO, MAUI. Location. — About 6J miles by trail east of Huelo and about 250 feet above junction with small tributary of Puohakamoa Stream. Records available. — December 18, 1910, to September 30, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made from log at gage. Accuracy. — Records fair. Cooperation. — Station maintained in cooperation with East Maui Ditch Co. The following discharge measurement was made by C. T. Bailey: June 19, 1913: Gage height, 0.90 foot; discharge, 12.2 second-feet. Monthly discharge of Spreckels ditch at gage No. 4, near Huelo, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-ofl (total in acre-feet). Accu- racy. January . . February. March April May June July August. The period. 9.5 7.5 4.0 11.5 9.5 9.5 5.5 4.5 7.0 21.2 15.2 14.6 27.8 18.3 18.3 19.0 17.3 13.7 1,300 1,650 1,130 1,090 1,170 1,060 815 10,000 ISLAND OF MAUI. 143 SPRECKELS DITCH AT GAGE NO. 5, NEAR HUELO, MAUI, Location. — About 5 miles east of Huelo and about 500 feet above drop into Alo Stream. Records available. — November 6, 1911, to September 30, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made from plank at gage. Accuracy. — Records good. Cooperation. — Station maintained in cooperation with East Maui Ditch Co. The following discharge measurement was made by C. T. Bailey: June 4, 1913: Gage height, 1.10 feet; discharge, 21.6 second-feet. Monthly discharge of Sprechels ditch at gage No. 5, near Huelo, Maui, for 1913. Discharge in second-feet. Maximum. Minimum. Mean, Rim-ofl (total in acre-feet). Accu- racy. January... February. . March April May June July August September. The period . 33.7 24.6 24.3 43.4 30.3 28.2 31.5 30.4 21.7 2,070 1,370 1,490 2,580 1,860 1,680 1.940 1,870 1,290 16.200 SPRECKELS DITCH AT GAGE NO. 6, NEAR HUELO, MAUI. liocation. — About 3 J miles east of Huelo and 100 feet below Kolea Stream intake. Records available. — November 4, 1911, to June 30, 1913. Gage. — Vertical staff. Discharge measurements. — Made from log at gage. Control. — Probably permanent. Accuracy. — Records good. Cooperation. — Station maintained in cooperation with East Maui Ditch Co. The following discharge measurement was made by C. T. Bailey: June 14, 1913: Gage height, 1.35 feet; discharge, 44.5 second-feet. Monthly discharge of Sprecksls ditch at gage No. 6, near Huelo, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-off (total in acre-feet). Accu- racy. January . . February. March April May June 33.4 30.6 31.8 45.5 42.4 39.7 The period . 2,050 1,700 1,960 2,710 2,610 2,360 13,400 144 WATER EESOUECES OF HAWAII, 1913. SPRECKELS DITCH AT GAGE NO. 8, NEAR HUELO, MAUI. Location. — About 1 mile by trail east of Huelo and 250 feet above gate to storage reservoir. Records available. — ^November 4, 1911, to September 30, 1913. Gage. — Vertical staff. Control. — Probably permaneiit. Discharge measurements. — Made from plank. Accviracy. — Records fair. Discharge estimated for Sundays, when no gage record was obtained. Cooperation. — Station maintained in cooperation with East Maui Ditch Co. The following discharge measurement was made by C. T. Bailey: June 4, 1913: Gage height, 2.10 feet; discharge, 45.1 second-feet. Monthly discharge of Sprechels ditch at gage No. 8, near Huelo, Maui, for 1913. Dischai'ge in second-feet. Maximum. Minimum. Mean. Run-off (total in acre-feet). Accu- racy. January February. . March April May June July August September. The period . 5.2 1.9 16 22 33 32 13 17 22 17.5 22.9 34.1 51.3 45.4 43.9 40.6 38.1 29.8 1,080 1,270 2,100 3,OcO 2,790 2,610 2,500 2,340 1,770 19,500 NAILIILIHAELE STREAM NEAR HUELO, MAUI. liocation. — About 300 feet above New Hamakua ditch, 3 miles south of Huelo post office. Records available. — December 9, 1910, to December 31, 1912; October 8 to De- cember 31, 1913. Gage. — Barrett & Lawrence water stage recorder. Control. — Probably permanent. Discharge measurements. — Made from footbridge. Diversions. — None above station. Accuracy. — Records good. Discharge measurevients of Nailiilihaele Stream near Huelo, Maui, in 1913. Date. Made by— Gage height. Dis- charge. Date. Made by— height. Dis- charge. Oct. 2.... 9 E. 0. Christiansen. . do Feet. 0.86 1.17 1.58 Sec.-ft. 6.89 26.6 52.9 Nov.13.. IS.. C.T.Bailey do Feet. 1.70 2.38 3.30 Sec.-fi. 67.5 174 Nov. 3. do 19.. do 514 ISLAND OP MAUI. 145 Daily discharge, in second-feet, of Nailiilihaele Stream near Huelo, Maui, for 1913. Day. Oct. Nov. Dec. Day. Oct. Nov. Dec. 1 3.6 13 158 104 35 28 27 290 365 251 111 160 91 44 37 32 37 65 674 245 160 71 91 62 48 41 37 33 144 71 16 14 12 8.5 8.0 8.0 8.0 8.0 7.4 6.8 6.5 5.3 5.0 5.0 3.6 3.6 3.6 45 67 225 275 122 91 48 38 103 106 140 86 52 44 36 46 2 17 63 3 18 110 4 19 49 5 20 40 6 21... . 34 7 22 31 8 ... 156 32 15 14 12 49 42 18 23 . 27 9: 24 25 10 25 23 11 .... 26 18 12 27 13 13 28 13 14 29 12 15 30 12 31 11 Monthly discharge of Nailiilihaele Stream near Huelo, Maui, for 1913. Month. Discharge in second-feet. Run-off (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. October 8-31 156 365 674 3.6 3.6 11.0 18.8 106 75.4 895 6,310 4,640 A. A. December A. KAILUA SIREAM NEAR HUELO, MAUI, Location. — One mile south of Huelo post office and 800 feet above Spreckels ditch, at 1,250 feet elevation. Records available. — December 8, 1910, to December 31, 1912; June 17 to De- cember 31, 1913. Gage. — Barrett & Lawrence water-stage recorder October 1 to December 31; vertical staff June 17 to September 30. Control. — Probably permanent. Discharge measurements. — Made from footbridge or by wading. Diversions.— Old Hamakua ditch formerly diverted water above station, but that section of ditch is not used at present time. Accuracy. — Records good October 1 to December 31; poor remainder of period on account of uncertainty of gage heights. Discharge measurements of Kailua Stream near Huelo, Maui, in 1913. Date. Made by — Gage height. Dis- charge. Date. Made by— Gage height. Dis- charge. June 16.. Aug. 26 . . Oct. 2... C. T. Bailey E. 0. Christiansen, .do... Feet. 1.38 1.23 1.14 1.53 Sec-ft. 8.51 4.37 2.95 19.4 Nov. 3. 13. 18. E. 0. Christiansen. C. T. Bailey do Feet. 2.60 2.03 3.42 3.90 Sec-ft. 73.8 37.4 188 9... .. .do 19. do 270 97764°— wsp 373—15- -10 146 WATER EESOTJECES OF HAWAII, 1913. Daily discharge, in second-feet, of Kailua Stream near Huelo, Maui, for 1913. Day. June. July. Aug. Sept. Oct. Nov. Dec. 1 45 149 28 47 32 42 20 11 7.5 8.8 8.8 9.4 17 14 8.8 7.5 6.2 5.8 5.8 5.8 5.3 4.9 4.7 4.7 4.4 4.9 4.4 4.0 4.0 3.6 3.5 11 3.3 2.9 2.9 2.9 4.0 42 12 6.2 6.2 4.9 212 26 19 91 19 10 7.5 7.2 6.7 6.7 6.2 5.8 6.0 5.3 5.3 8.3 6.7 5.1 4.4 24 6.2 5.3 5.3 4.9 4.0 3.6 6.2 3.5 3.6 3.6 3.3 3.3 3.6 3.6 3.6 4.9 10 111 24 9.4 6.7 5.3 4.7 4.4 4.4 3.8 3.6 3.6 3.6 3.5 "■"ei"" 13 6.2 5.5 5.3 12 8.8 8.0 7.8 7.2 4.0 4.0 4.0 3.3 2.9 2.9 2.9 2.9 2.7 2.7 3.3 3.5 3.8 4.0 4.0 30 136 65 22 16 31 216 384 186 70 112 41 22 19 46 106 314 290 79 56 30 25 174 88 100 42 33 28 25 21 2 20 3 22 4 443 5 262 6 104 7 56 8 45 9 26 10 17 11 13 12 12 13 11 61 15 69 16 28 7.5 6.7 6.0 5.8 5.1 5.1 4.4 4.0 6.0 6.7 15 12 6.7 38 28 18 81 28 20 20 21 18 22 16 23 14 13 25 12 26 11 11 28 10 12 30 11 11 Note. — No record Oct. 1-7. Monthly discharge of Kailua Stream near Huelo, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-off (in acre-feet). Accu- racy. Jtme 17-30. . . July August September. . . October 8-31 November. . . December. . . 38 149 212 111 61 384 443 4.0 3.5 2.9 3.3 2.7 4.0 10.0 9.21 17.0 18.7 7.57 5.86 93.0 48.6 256 1,040 1,150 528 360 5,530 2,990 The period . 11,900 Note. — Water-stage recorder installed October 1. OANUI STREAM NEAR HUELO, MAUI. Location. — At New Hamakua ditch crossing, 1 mile soitth of Huelo post office. Records available. — December 7, 1910, to December 31, 1911; June 17 to December 31, 1913. Gage. — Vertical staff in two sections. Control. — Upper side of New Hamakua ditcb forms permanent control. Discharge measurements. — Made by wading. Diversions. — None above station. Accuracy. — Records fair. ISLAND OF MAUI. 147 Monthly discharge ofOanui Stream near Huelo, Maui, for 1913. Month. Discharge in second-feet. Maximum. Miaimum. Mean. Run-ofE (total in acre-feet). Accu- racy. June 17-30. July August September. October November.. December . . 3.5 3.5 3.5 3.5 3.5 3.0 3.5 4.46 4.98 5.00 3.75 3.95 12.4 9.87 The period . 124 306 307 223 243 738 607 2,550 HOOLAWANUI STREAM NEAR HUELO, MAUI. Location. — One-fourth mile east of Lupi and about 5 miles by trail from Huelo; 300 feet above crossing of New Hamakua ditch. Records available. — December 12, 1910, to December 31, 1913. Gage.^ — Vertical staff; datum lowered 0.20 foot June 6, 1913. Control. — Probably permanent. Discharge measurements. — Made by wading. Diversions. — None above station. Accuracy. — Records fair. Cooperation. — Station is maintained in cooperation with East Maui Ditch Co. Discharge measurements of Hoolawanui Stream, near Huelo, Maui, in 1913. Date. Made by— Gage height. Dis- charge. Date. Made by— Gage height. Dis- charge. June 5 Aug. 27 . . C. T. Bailey do Feet. 0.30 .34 Sec.-ft. 2.84 4.68 Oct. 2... Nov. 19 . E. 0. Christiansen. C. T. Bailey Feet. 0.24 1.02 Sec.-ft. 1.79 62.8 Daily discharge, in second feet, of Hoolawanui Stream near Hu^lo, Maui, for 1913. Day. 1 2 3 4, 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. 12 4 4 15 9 2.0 13 2.3 2.6 1.9 1.9 9 4 3 8 8 3.0 32 2.3 2.6 1.9 2.1 8 3 3 6 8 2.0 10 2.5 2.6 4.0 15 7 3 3 6 7 6.0 11 2.3 2.5 2.3 17 6 3 3 5 6 3.0 9.2 2.3 2.3 1.9 5 6 88 3 5 6 3.0 12 2.6 2.3 2.5 5.0 5 7 3 4 5 3.0 9.2 5.0 2.6 2.6 4.0 10 5 3 4 5 2.6 8.0 2.6 2.3 19 46 10 4 4 4 5 2.8 7.0 2.3 2.3 4.0 94 10 4 3 4 4 4.0 6.5 2.5 2.3 3.0 62 7 3 3 40 4 2.6 6.0 2.3 2.3 2.6 48 7 3 3 20 4 18 6.0 33 2.3 2.5 56 52 3 2 71 4 10 6.5 7.5 2.3 7.0 24 44 3 2 50 5 8.0 6.5 5.5 2.3 3.5 17 71 3 2 88 8 6.0 6.0 30 2.1 2.6 15 13 4 8 82 6 5.0 5.0 9.2 2.3 2.6 16 12 3 6 96 7 4.0 4.5 8.6 3.5 2.6 16 10 11 6 48 5 3.0 4.0 6.5 9.2 2.5 66 10 48 4 30 5 3.0 4.0 5.0 5.0 2.3 82 9 8 4 27 4 3.0 3.5 5.0 2.6 2.3 38 8 7 5 30 3 3.0 3.0 5.0 2.6 2.3 29 7 6 10 17 3 3.0 3.0 4.0 2.3 2.3 23 6 5 5 16 3 3.0 3.0 3.5 2.3 2.1 17 5 5 4 16 3 2.8 2.8 3.0 2.3 2.1 44 5 4 6 29 3 3.0 2.6 3.0 2.1 2.1 33 4 4 3 15 6 4.0 2.6 3.0 2.1 2.1 36 4 4 3 22 4 9.2 2.6 3.5 2.1 2.1 28 4 4 5 14 3 6.0 2.6 3.0 2.1 2.1 20 4 4 14 3 4.0 2.5 2.8 2.1 2.1 17 5 4 11 3 7.0 2.5 2.6 2.1 1.9 13 4 16 3 2.5 3.0 1.9 11 9.2 13 112 82 62 35 36 24 16 15 14 13 40 22 17 19 39 17 13 12 10 9.2 8.0 S.O 7.0 6.5 6.0 6.0 5.0 5.0 148 WATEE EESOTJBCES OF HAWAII, 1913. Monthly discharge of Hoolawanui Stream near Huelo, Maui, for 1913. Month. Discharge in second-feet. MaximuTn. Minimum. Mean. Run-ofl (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 71 88 16 96 9.0 18 32 33 9.2 19 94 112 112 4.0 3.0 2.0 4.0 3.0 2.0 2.5 2.3 2.1 1.9 1.9 5.0 12.1 9.04 4.39 26.5 4.90 4.63 6.44 5.67 2.68 3.12 29.7 22.3 10.9 744 502 270 1,580 301 276 396 349 159 192 1,770 1,370 7,910 HOOLAWALIILII STREAM NEAR HUELO, MAUI. Location. — ^About 400 feet above New Hamakua ditch, crossing, 1 J miles east of Lupi, and about 4 miles above Huelo post office. Records available. — April 5, 1911, to December 31, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made by wading. Diversions. — None above station. Accuracy. — Records good. Discharge measurements of Hoolawaliilii Stream near Huelo, Maui, in 1913. Date. Made by— Gage height. Dis- charge. Date. Made by— Gage height. Dif:- charge . June 6... Aug. 27.. C.T.Bailey E. O. Christiansen. Feet. 0.14 .16 Sec.-ft. 3.12 3.66 Oct. 2... Nov. 19. E. 0. Christiansen. C.T.BaUey Feet. 0.11 .51 Sec.-ft. 2.30 31.2 ISLAifD OF MAtJl. 149 Daily discharge, in second-feet, of Hoolawaliilii Stream near Huelo, Maui, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 7.0 5.7 4.9 4.1 3.4 3.4 3.0 5.7 5.7 5.7 4.9 4.1 26 28 28 22 8.8 6.3 5.3 4.9 4.1 4.1 3.4 3.4 3.4 3.4 3.4 2.6 2.6 2.2 2.2 2.2 2.2 2.2 1.8 2.6 36 24 3.4 3.4 2.6 2.6 2.2 2.2 2.2 2.2 2.2 2.2 5.7 23 3.4 3.0 2.6 2.2 2.2 1.8 1.8 1.8 1.8 1.8 1.6 1.6 1.6 1.6 1.8 1.6 2.2 1.6 1.4 1.4 1.4 1.4 1.4 1.4 4.5 3.4 3.8 2.2 2.6 2.6 4.9 2.6 2.2 2.6 1.8 1.8 3.0 2.6 2.6 9.5 8.2 3.4 2.6 2.6 2.6 2.2 2.2 1.8 2.6 1.8 32 10 34 22 37 34 43 26 14 12 13 11 8.2 7.6 16 10 8.2 5.7 5.3 4.1 4.1 3.8 3.8 3.4 3.4 3.4 3.0 2.6 2.6 2.2 1.8 1.8 1.8 2.2 3.0 2.6 2.6 2.6 1.8 1.8 1.6 1.4 1.4 1.6 1.4 2.6 1.8 i.e 1.4 1.4 1.4 1.4 1.3 1.3 2.2 1.4 1.4 1.4 1.4 1.4 1.8 1.4 4.5 5.7 5.3 4.9 3.4 3.4 1.8 1.6 1.6 1.6 1.6 1.6 1.6 1.8 1.8 5.3 4.9 3.4 7.6 8.2 16 8.2 8.2 8.2 9.5 7.0 5.7 5.7 4.9 4.9 4.1 4.9 4.5 4.1 4.1 3.8 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.0 3.0 2.6 2.6 2.6 2.6 2.6 2.6 2.6 2.6 2.2 2.6 4.5 2.6 2.6 3.0 2.6 23 5.7 4.9 11 7.0 4.9 4.9 4.5 4.1 4.5 4.1 4.1 3.4 3.4 3.4 3.8 3.4 3.4 3.4 4.1 3.0 3.0 3.4 3.0 2.6 2.6 3.0 3.0 3.4 2.6 2.6 2.6 3.0 2.6 2.6 2.6 3.4 5.7 3.8 3.4 3.0 3.0 3.0 2.6 2.6 2.6 2.6 2.6 2.6 2.6 2.2 2.2 4.5 2.6 2.6 3.0 3.4 9.5 4.1 3.4 2.6 2.6 7.0 3.8 3.4 3.4 3.4 3.0 3.0 3.0 3.0 2.6 2.6 2.6 2.6 2.6 2.6 2.2 2.2 2.2 2.2 2.2 2.2 4.9 5.7 4.1 3.4 3.0 21 30 23 21 37 19 14 11 11 9.5 23 32 21 16 13 11 16 15 21 17 13 11 9.5 8.2 2 7.6 3 8.2 4 41 5 . ... 39 6 36 7 26 8 24 9 16 10 11 11 8.8 12 8.8 13 8.2 14 16 15 11 16 8.2 17 8.8 18 16 19 8.2 20 8.2 21 7.6 22 . 7.0 23 5.7 24 . 5.3 25 4.9 26 4.5 27 4.5 28. 4.1 29 4.1 30 . 3.8 31 3.8 Monthly discharge of Hoolawaliilii Stream near Huelo, Maui, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-ofE (total in acre-feet). Accu- racy. January February March April May June July August September October November December The year 28 36 9.5 43 4.1 7.6 16 23 5.7 9.5 37 41 43 2.2 1.8 1.4 1.8 1.4 1.3 2.6 2.2 2.6 2.2 2.2 3.8 7.15 5.20 2.47 12.8 2.32 2.66 5.02 4.56 2.97 3.23 14.7 12.1 6.25 440 289 152 762 143 158 309 280 177 199 875 744 4,530 HONOPOU STREAM NEAR HUELO, MAUI. Location. — ^Three-fourtlis mile northwest of Lupi and about 3^ miles southwest of Huelo; 200 feet above New Hamakua ditch crossing. Records available. — December 10, 1910, to December 31, 1913. Gage. — Vertical staff. Control. — Probably permanent. Discharge measurements. — Made by wading. Diversions. — None above station. Accuracy. — Records good. Cooperation. — Station maintained in cooperation with East Maui Ditch Co. 150 WATER EESOtJECES OP HAWAII, 1913. Discharge measurements of Honopou Strearn near Huelo, Maui, in 1913. Date. Made by— Gage height. Discharge. Date. Made by— Gage height. Dis- charge. June 5... Aug. 27.. C.T.Bailey E. 0. Christiansen. Feet. 0.10 .20 Sec.-ft. 1.55 3.01 Nov. 19. C.T.Bailey Feet. 0.79 Sec.-ft. 19.5 Daily discharge, in second-feet, of Honopou Stream near Huelo, Maui, for 1912-13. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1912. 1 . 3.3 3.3 2.9 2.9 2.6 2.6 2.6 2.4 2.2 2.2 1.9 1.9 1.9 1.9 1.7 1.7 1.5 1.5 1.4 1.2 1.2 1.2 1.2 2.0 1.5 1.5 1.4 1.2 1.2 1.0 1.0 5.5 4.6 4.2 3.5 3.3 3.1 2.9 5.1 5.1 5.3 4.4 3.7 22 16 26 20 6.5 5.3 5.1 4.6 3.7 3.3 3.3 2.9 2.9 2.8 2.6 2.6 2.4 2.2 2.2 0.9 .9 .9 .9 .9 .8 .8 .9 1.9 1.2 1.2 1.2 3.3 2.0 1.4 1.2 1.0 .9 2.9 3.7 6.0 7.5 4.8 4.2 4.0 4.2 9.5 10 6.5 2.2 2.2 2.0 1.9 1.9 33 3.3 2.6 2.2 2.2 2.0 1.9 1.9 1.9 1.9 2.0 1.9 4.2 19 3.7 3.3 3.1 2.9 2.8 2.6 2.4 2.2 2.2 7.0 8.3 8.0 6.8 6.2 6.0 6.0 5.1 6.2 5.5 12 9.2 12 8.6 7.5 6.0 6.2 11 6.5 6.5 5.5 5.1 4.6 4.2 3.7 3.7 3.5 3.3 3.3 3.7 4.4 2.0 1.9 1.9 1.7 1.7 1.5 1.7 1.5 2.2 1.5 1.5 1.4 1.2 1.2 3.7 2.9 2.9 2.9 2.2 2.2 2.6 4.6 2.6 2.0 2.6 1.9 1.9 2.8 2.2 2.2 6.5 5.1 4.4 6.5 32 21 13 18 19 18 13 12 11 9.2 11 11 9.2 8.0 7.5 7.0 8.3 6.5 5.5 6.5 5.8 5.5 6.5 5.8 5.1 5.1 4.6 5.5 3.3 2.6 2.6 2.4 2.2 2.2 2.0 2.4 2.0 15 8.0 20 16 26 21 31 17 12 11 13 9.2 8.0 7.8 11 7.0 8.6 6.5 5.8 5.1 4.2 4.2 4.0 5.1 3.7 3.7 3.3 3.7 3.3 2.9 2.8 2.6 2.6 2.4 2.2 2.0 2.0 2.0 2.0 2.2 2.0 1.9 1.7 1.9 1.5 2.6 3.5 2.9 2.9 2.0 2.2 4.6 4.2 4.0 3.7 3.3 3.3 3.1 2.9 2.6 2.6 2.4 2.6 2.4 2.6 3.7 2.9 3.3 2.6 2.6 2.2 1.9 1.7 1.7 1.9 1.9 2.4 1.9 1.7 1.5 1.5 1.5 1.9 1.7 1.5 1.5 1.5 1.5 1.4 1.4 1.4 2.2 1.9 1.9 1.9 1.7 1.9 1.9 1.5 1.5 1.5 1.6 1.5 1.5 1.4 2.9 1.9 1.7 1.7 1.7 1.5 1.5 1.4 1.2 1.2 2.2 1.5 1.4 1.5 1.4 1.5 1.9 1.2 4.2 3.7 2.9 2.6 2.2 1.9 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.9 4.4 2.9 2.2 4.6 1.5 1.5 2.0 2.8 1.9 1.7 1.9 1.7 4.6 1.9 2.6 1.9 1.9 1.7 1.7 1.7 1.5 1.5 1.5 1.5 1.5 1.4 1.4 1.9 1.9 1.5 1.4 1.7 1.5 1.2 1.2 3.7 8.6 4.6 4.6 4.2 4.8 4.0 3.7 3.5 3.3 3.1 2.9 2.9 2.9 2.8 2.6 2.2 2.2 2.0 2.0 1.9 1.9 1.7 1.7 1.5 1.5 1.5 1.5 1.4 1.4 1.2 1.2 1.0 1.0 .9 .9 .9 .9 .9 .9 1.4 2.2 1.2 1.2 1.5 3.7 1.9 1.2 1.0 .9 .9 .9 1.9 .9 .9 .9 .8 .8 .8 .9 .9 .9 1.2 1.2 1.2 1.2 1.0 1.2 3.7 1.5 1.2 1.2 1.0 10 3.3 2.9 6.8 3.5 3.1 2.8 2.6 2.6 2.6 2.2 2.0 1.9 1.9 1.9 2.0 1.9 1.9 1.5 1.9 1.0 2.8 1.7 2.8 1.5 1.5 2.2 1.7 1.5 1.2 1.2 1.0 1.0 .9 .9 .9 .9 .9 .8 .9 .8 .8 .8 .8 .6 .6 .6 .6 .9 1.5 1.5 1.5 1.5 1.4 1.2 1.2 1.2 1.2 1.2 1.4 1.2 1.2 1.2 1.0 .9 1.2 1.9 3.3 2.0 1.2 1.2 1.0 .9 .9 .9 .9 .9 .9 .9 .9 1.0 1.5 .9 .6 .6 .6 .6 .6 .6 .6 .6 .6 .6 49 1.2 .9 .6 .6 .6 .6 2.9 3.5 3.3 2.6 2.2 2.4 10 12 4.2 5.1 8.3 0.9 .9 .9 .9 .9 1.2 1.4 5.3 1.9 1.5 1.2 1.2 3.7 2.2 1.5 1.4 1.2 1.2 1.2 1.0 1.0 1.0 1.0 .9 .9 .9 .9 .9 .9 .9 .9 5.3 4.2 7.2 4.2 3.3 3.3 2.9 2.6 19 8.6 7.0 5.1 4.6 4.2 .3.7 8.0 9.5 12 10 7.8 6.2 6.0 5.5 5.1 5.5 5.1 5.1 4.2 3.5 3.3 0.9 .9 2.9 3.5 2.2 2.2 1.9 17 22 20 16 24 11 11 9.8 8.3 7.5 14 22 15 15 10 9.2 12 14 15 13 11 8.6 8.0 4.2 2 13 3 25 4 12 5 7.8 6 7.0 7 7.2 8 6.5 9 4.6 10 5.1 11 4.6 12 4.2 13 . 3.7 14 3.7 15 3.5 16 3.5 17 4.2 18 ... 4.2 19 7.5 20 5.1 21 14 22 16 23.. .. 16 24 10 25 8.9 26 8.0 27 7.0 28 7.5 29 7.0 30 6.0 31 5.1 1913. 1 7 2 6.5 3 7 4 36 5 29 6 22 7 16 8 17 9 13 10 11 11 9 2 12 8.9 13 7 5 14 16 15 10 16 8.6 17 9 2 18 12 19 8 3 20 ... 7 2 21 6 5 22 6.0 23 5 5 24 5 1 25 5 1 26 4 6 27 4 2 28 3 7 29... 3 3 30 3 1 31 3 1 ISLAND OF MAUI. 151 Monthly discharge of Honopou Stream near Huelo, Maui, for 1912-13. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-oflE (total in acre-feet). Accu- racy. 1912 January February March April May June July August September October November December The year 1913 January February March April May June July August September October November December The year 3.3 10 12 32 5.1 2.9 4.6 3.7 2.8 49 19 25 49 26 33 6.5 31 4.6 4.6 8.6 10 3.3 5.3 24 36 3.3 4.4 1.5 1.4 1.2 2.6 3.5 0.6 2.2 1.9 1.2 2.0 1.5 1.2 1.2 1.0 3.1 1.87 2.95 6.31 10.0 2.77 1.68 1.79 1.17 1.18 3.85 6.07 7.81 3.95 6.04 4.12 2.31 9.54 2.62 2.06 2.83 2.42 1.26 1.35 10.9 10.1 115 170 388 595 170 100 110 71.9 70.2 237 361 480 371 229 142 568 161 123 174 149 75 83 649 621 36 0.9 4.62 3,340 MISCELLANEOUS ME ASUEEMENTS . Measurements of streams on the island of Maui at points other than regular gaging stations are listed below: Miscellaneous discharge measurements on Maui for 1913. Date. Stream. Locality. Gage height. Dis- charge. Mar. 15 South Waiehu Wailuku Feet. 0.60 .89 1.35 .81 4.80 4.65 2.30 2.80 .86 .25 Sec.-ft. 69 Apr. 9 9 Waikapu (North Fork)" Old shops below tunnel portal 300 feet above junction with South Fork. Olowalu 2.68 do 2.73 16 Olowalu 51.6 16 Olowalu ditch No. 2 do 16.9 Nailiihaele Huelo 2.16 7 New Hamakua ditch, Gage No. 5 do 42.4 7 New Hamakua ditch. Gage No. 4 do 37.0 7 New Hamakua ditch. Gage No. 3 do 31.6 7 New Hamakua ditch, Gage No. 1 do 34.3 7 New Hamakua ditch Halehaku Weir, Huelo Huelo 73.0 Halehaloi 2.63 July 21 21 Lower Springs Kalepo Gulch, near Kaupo . . .44 Uutier Serines do .22 21 Manawainui Below large springs, near Kaupo. Above large springs, near Kaupo. Near Kipahulu 2.03 21 do 1.22 July 22 22 Alelele .36 Oheo Wooden bridge near Kipahulu 1.17 22 Puaaluu do 2.24 22 Halalawe . . . ...do 1.86 22 do 1.29 22 Kaili . . do 1.88 23 Near Keanae 1.71 23 East Wailuaiki do 7.00 Sept. 30 30 At Intake near Lahaina 2.76 do . .... Above Intake near Lahaina . . 4.48 Apr. 14 Aug. 19 Kahoma 1.16 .62 9.21 do do .19 a Tributary to Waikapu Stream. 152 WATER EESOTJECES OP HAWAII^ 1913. Miscellaneous discharge measurements on Maui for 1913 — Continued. Date. Stream. Locality. Gage height. Dis- charge. Apr. IS 29 Kauaula Near Lahaina Feet. 1.35 .96 1.44 1.04 1.40 .72 1.15 1.38 .84 1.81 6.02 3.61 Sec.-ft. 63.4 do.o do 10.8 May 14 Aug. 19 Apr. 16 21 . ...do do 40.6 do do 8.84 Near Olowalu 72.8 do .... do 11.6 22 do.b do 11.8 May 15 Aug. 20 . .do do 36.6 do do 6.37 Near Huelo .29 Nov. 18 Near Keanae 554 20 do do 32 a New gage established May 15, 1913. * New datum; gage moved to better location. ISLAND OF HAWAII. GENERAL CONDITIONS. The perennial streams of the Island of Hawaii are mainly included in two groups, one comprising an area about 10 miles wide, in the Kohala and Hamakua districts, and the other an area about 16 miles wide in the Hilo district between the South Branch of Wailuku River on the southeast and Maulua Gulch on the northwest. The low water run-off from the Kohala and Hamakua districts is now practically all diverted into ditches serving the sugar lands of the north coast of the island. Only a small part of the mean run-o£F from the Hilo district is now being utilized, the greater part being allowed to waste into the sea. It has been proposed to construct a high-line canal at an elevation of about 2,700 feet and carry this water to serve either thesemiarid lands of Kau on the south side of the island, or the dry government lands in the vicinity of Waimea which are now being leased for cattle range. In September, 1911, a concession was sought, and later granted, by a promotor for the construction of what was generally known as the Kau ditch project, and at the request of the territorial officials the work of investigating the run-off of the Hilo district along the 2,700-foot contour was begun. In September, October, and Novem- ber, 1911, a foot trail was cut through the swamp and jungle from the South Branch of Wailuku River to the North Branch of Kawainui River, a distance of about 8 miles by trail. Staff gages were estab- lished on aU appreciable channels, whether of perennial discharge or not. Eighty-three stations were established and a camp was built about midway on the trail. Lack of funds prohibited further extension of the. work and the construction of bridges or cables across the large gulches with the result that the larger streams could not be crossed when in flood. The trail was merely a passage cut through the ISLAND OF HAWAII. 16S jungle, over and under logs, in and out of gulches, and, for the greater part, from a few inches to several feet deep in swamp muck. Two gage readers were employed who lived in the midway camp and who went over the trail once a day on an average of about four days in the week and read the gages — one man working south and the other north and return. The condition of the trail was such that about eight hours were necessary to cover the 8-mile trip. All supplies for the camp and work were packed in on men's backs from the end of the Kaiwiki homestead road, a distance of about 3^ miles. One day of the week was allowed the observers for packing in supplies, and one day for rest. Up until May, 1913, when funds became available for the construction of cableways across the larger gulches, many daily records were lost on account of the observers being unable to cross these gulches when in flood. On account of the flashy type of the streams it was found that two readings daily, within a few hours of each other, gave a very poor index of the daily mean gage heights of the streams. In the spring of 1913 it became apparent that the Kau ditch pro- ject would not soon be completed, and this fact, coupled with the high cost of obtaining the unsatisfactory and meager data on surface fluctuation, led to the suspension of the work until funds would be available to construct a dry trail across the entire district, to estab- hsh water-stage recorders on the larger streams, and to improve cross sections, controls, and other features. The work was sus- pended on July 18, 1913. Ten rain gages read at monthly and bimonthly periods were estab- lished at approximately 500-foot elevation intervals from sea level to 5,000 feet, the approximate elevation at which the wet, or forest, zone meets the arid lava slopes of Mauna Kea Mountain. Practi- cally all rainfall above the 5,000-foot contour is absorbed by the porous lava. Rainfall observations were terminated on June 30, 1913. HILO GROUP. STATIONS AT 2,700-FOOT LEVEL. Location. — On trail in forest back of Hilo, at approximately 2,700 feet above sea level. The trail is about 8 miles long and the camp, about midway on the trail, is reached by a foot trail 3^ miles long from the end of the Kaiwiki homestead road. The camp is about 7 miles west-northwest from Hilo. Beginning at the South Branch of Wailuku River, the stations are niunbered from 1 to 18 and from 25 to 87, including stations Nos. 12a and 86a, to the North Branch of Kawainui River. There are no stations niunbered 19 to 24. Records available.— Stations 1-12, October 6, 1911, to July 18, 1913. Station 12a, November 30, 1912, to July 18, 1913. Stations 13-18, 25-27, October 5, 1911, to July 18, 1913. Stations 28-41, September 28, 1911, to July 18, 1913. Stations 42^7, September 28, 1911, to July 18, 1913. Stations 48-50, September 31, 1911, to July 18, 1913. Stations 51-52, October 7, 1911, to July 18, 1913. Stations 154 WATER EESOUECES OF HAWAII, 1913. 53-65, October 10, 1911, to July 19, 1913. Stations 66-68, October 21, 1911, to July 18, 1913. Stations 69-74, November 13, 1911, to July 18, 1913. Stations 75-86, November 14, 1911, to July 18, 1913. Station 86a, November 18, 1912, to July 18, 1913. Station 87, November 14, 1911, to July 18, 1913. Drainage area. — About 75 square miles for all stations (may be in error 20 per cent). Gages. — Vertical staff read to nearest two-hundredths, twice daily, about 4 days in the week. Diversions. — All low-water run-off is diverted below the stations, but it is estimated that less than 20 per cent of the mean discharge is being utilized; no diversions above the stations. Accuracy. — At only 24 of the 83 stations maintained is the discharge sufficient to warrant current-meter measurements and ratings; mean discharge at each of the other 59 stations is one-half second-foot or less; the aggregate mean run-off of these 59 stations for the period January 1 to June 18, 1913, is estimated to have been only 4.2 second-feet. As the mean discharge of the 24 streams rated was 194.0 second-feet, the mean run-off for the 59 estimated stations was less than 2 per cent of the total. For these stations for which ratings have been made and results published rating curves are all fairly well defined for low and medium stages.. Discharge for days for which there are no gage-height records was esti- mated from daily rainfall records at camp near station No. 51. The total mean run-off for all stations for the period January 1 to July 18, 1913, was 198.2 second-feet. The minimum run-off, which was less than 6 second-feet, occurred in March. The maximum run-off of all stations probably exceeded 5,000 second-feet. Discharge measurements made at unrated stations on 2,700-foot level near JSilo, Hawaii, during the period Jan. 1 to July 18, 1913. [E. O. Christiansen, hydrographer.] Station No. Date. Gage height. Dis- charge. Station No. Date. Gage height. Dis- charge. 39 Apr. 24 May 16 Apr. 24 May 16 Apr. 23 May 4 ...do May 14 ...do ...do May 15 ...do ...do ...do ...do ...do Feet. 0.90 .96 .49 1.00 .93 2.38 2.28 2.22 2.24 2.28 2.23 2.26 2.28 2.30 2.32 2.34 Sec.-ft. 0.23 .44 .80 2.4 .83 1.22 .12 .06 .08 .11 .07 .10 .12 .12 .13 .18 60 o May 15 ...do....: ...do May 21 May 22 ...do May 23 May 24 May 29 May 30 May 31 Apr. 18 ..do Feet. 2.36 2.38 2.39 2.19 2.18 2.17 2.16 2.14 2.24 2.20 2.25 1.22 .81 .99 .90 Sec.-fj. 0.21 41 55 .23 .25 49 .04 .03 50 a .03 .03 .02 .07 .05 .08 1.03 59 .77 70 ...do 1.19 73 ...do . .48 a All measurements on station No. 50 made by the Yolumetric method. Discharge measurements of station No. 1 at 2,700-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Dis- charge. Apr. 29. May 24. Sec.-ft. 6.5 ISLAND OF HAWAII. 155 Monthly discharge of station No. 1 at 2,700-foot level near Silo, Hawaii, for 191S. Month. Discharge in second-feet. Maximum. Minimum. Mean, Run-off (total in acre-feet). Accu- racy. January . . February. March April May June July 1-18. 160 28 146 60 (o) (o) ,1 .4 .6 9.0 19.4 3.63 .07 18.6 5.14 25.9 29.5 1,190 130 1 1,110 316 1,540 1,050 The period . 5,340 a No flow. Discharge measurements of station No. 3 at 2,700-foot level near Eilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 29 Feet. 0.40 .11 Sec.-ft. 7.02 May 24 3.16 Monthly discharge of station No. 3 at 2,700-foot level near Hilo, Hawaii, for 1913. Discharge in second-feet. Maximum. Minimum. Run-off (total in acre-feet). Accu- racy. January . . February. March April May June July 1-18. 15 5.5 5.8 68 11 53 32 (a) (a) 7.0 4.7 2.5 2.9 2.7 10.0 .75 1.74 13.4 4.70 11.8 13.4 615 42 107 797 289 702 477 The period . 3,030 oNo flow. Discharge measurements of station No. 12 at 2,700-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 29 Feet. 1.18 .99 Sec.-ft. 7.5 May 24 .' 2.8 156 WATER EESOtJECES OF HAWAIi, l9lS. Monthly discharge of station No. 12 at 2,700-foot level near Hilo, Hawaii, for 19lS. January.. February. March April May June July 1-18. Tlie period . Month. Discharge in second-feet. Maximum. Minimum. 34 2.8 6.1 63 6.1 57 53 2.8 .3 .3 3.0 2.0 2.3 2.2 12.5 1.03 1.47 12.0 3.48 10.9 13.3 Run-ofl (total in acre-feet). 769 57 90 714 214 649 474 2,970 Accu- racy. Discharge measurements of station No. IS at2J00-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 29 Feet. 1.05 .74 Sec.-ft. 9.2 May 24 2.25 Monthly discharge of station No. 13 at 2,700-foot level near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean, Run-off (total in acre-feet). Accu- racy. January. . February. March April May Jime July 1-18. 38 3.9 11 54 9.4 47 44 (a) 4.5 .2 5.1 2.1 3.2 1.9 12.8 1.09 2.94 12.8 4.62 11.3 13.6 787 60 181 762 284 672 483 The period. 3,230 o No flow. Discharge measurements of station No. 15 at 2,700-foot level near Hilo, Hawaii, in 1911 [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 29. May 24.. Feet. 1.26 1.10 Sec.-ft. 3.4 .64 ISLAND OP HAWAII. 157 Monthly discharge of station No. 15 at 2,700-foot level near JSilo, Hawaii, for 191S. Month. Discharge in second-feet. Run-off (total in acre-feet). Accu- Maximum. Minimum. Mean. January 17 .5 4.0 58 3.3 25 29 0.7 .2 (a) 1.4 .7 .8 .6 5.78 .37 .74 9.57 1.31 4.70 6.69 355 20 46 569 81 280 238 D. February D. March D. D. May June D. D. July 1-18 D. 1,590 a No flow. Discharge measurements of station No. 27 at 2,700-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 24 Feet. 1.63 1.81 Sec.-ft. 4.1 May 16 '- 8.4 Monthly discharge of station No. 27 at 2,700-foot level near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. Run-off (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. 30 2.3 4.0 48 6.2 41 38 2.3 .4 .2 2.9 1.2 1.8 1.8 7.93 1.00 1.62 8.61 2.70 8.33 1.02 488 56 100 512 166 496 365 D. D. D. D. D June D. July 1-18 D. The period 2,180 Discharge measurements of station No. 28 at 2,700-foot level near Hilo, Hawaii, in 1913. fE. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 24 Feet. 0.90 1.85 Sec.-ft. 10.0 May 16 41.5 Monthly discharge of station No. 28 at 2,700-foot level near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. Run-off (total in acre-feet). Accu- Maximum. Minimum. Mean. 176 6.0 9.8 181 14 135 90 8.0 .1 (») 2.0 .4 1.0 .3 60.7 2.45 1.27 26.5 3.06 19.7 22.0 3,730 136 78 1,580 188 1,170 785 D. D. D. D. D. D. July 1-18 D. 7,670 a No flow. 158 WATEE RESOURCES OF HAWAII^ 1913. Discharge measurements of station No. 31 at 2,700-foot level near JSilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. height. Dis- charge. Apr. 24 Feet. 0.80 1.05 Sec.-ft. 4.76 May 16 9.44 Monthly discharge of station No. 31 at 2, 700 foot level near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. Run-off (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. 52 2.6 17 115 8.5 34 50 2.6 .2 (a) 3.2 1.1 1.7 .9 14.0 .76 2.23 18.0 2.94 8.05 11.2 861 42 137 1,070 181 479 402 D. D. March D. April D. D. June D. July 1-18 D. The period ^3,170 a No flow. Discharge measurements of station No. 34 at 2,700-foot level near Hilo, Hawaii, in 1918. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 24 Feet. 1.07 1.14 Sec.-ft. 0.90 May 16 1.90 Monthly discharge of station No. 34 at 2,700-foot level near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean, Run-off (total in acre-feet). Accu- racy. January.. February. March . - . April May June July 1-18. 16 .6 2.6 24 1.3 7.1 10 0.2 .2 .2 .6 .3 .4 .3 2.51 .27 .47 3.63 .63 1.35 2.12 154 15.0 28.9 216 38.7 80.3 75.6 The period. 608 Discharge measurements of station No. 46 at 2,700-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. height. Dis- charge. Apr. 24. May 15. Feet. 1.62 1.72 Sec.-ft. 9.6 13.6 ISLAND OF HAWAII. 159 Monthly discharge of station No. 46 at 2,700-foot level near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. Kun-ofl (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. 195 4.4 16 188 46 104 82 5.8 (o) 3.0 4.4 2.5 56.4 1.49 2.85 32.4 9.47 21.7 25.4 3,470 83 175 1,930 582 1,290 907 D. February D. D. April . D. D. D. July 1-18 D. The period 8,440 a. No flow. Discharge measurements of station No. 47 at 2,700 foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- Apr. 24. May 15. Feet. 1.8 1.8 Sec-ft. 3.6 3.0 Monthly discharge of station No. 47 at 2, 700 foot level near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. Maximiun. Minimum. Mean Run-off (total in acre-feet). Accu- racy. January.. February. March April May Jime July 1-18. The period . 42 1.3 7.0 25 5.3 15 17 1.9 10.6 .3 .68 .2 1.44 2.1 5.51 1.2 2.35 1.4 5.00 1.7 6.29 652 38 328 144 Discharge measurements of station No. 52 at 2,700 foot level near Hilo, Hawaii, in 1913. [E. 0. Christiansen, hydrographer.] Date. Gage height. Dis- Apr. 23. May 21. Feet. 1.06 .81 Sec-ft. 21.2 11.8 160 WATER EESOUECES OF HAWAII, 1913. Monthly discharge of station No. 52 at 2,700-foot level near JSilo, Hawaii, for 191S. Month. Discharge in second-feet. Maximum. Minimum. Mean Run-ofl (total in acre-feet). Accu- racy. January . . February. March April May June July 1-18. 582 7.6 48 219 74 342 155 6.2 1.1 .4 16 6.6 8.9 7.4 3.57 10.1 50.1 17.8 52.6 49.5 5,770 198 621 2,980 1,090 3,130 1,760 The period . 15, 500 Discharge measurements of station No. 54 at 2, 700 foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 18 Feet. 0.89 Sec.-fi. 1.63 Monthly discharge of station No. 54 at 2, 700 foot level near Hilo, Hawaii, for 1913. Month. January . . February. March April May June July 1-18 . The period. Discharge in second-feet. Maximum. Minimum. Mean. 44 .5 (a) 13 (a) 28 3.4 14 18 (a) 7.39 .13 1.32 5.88 .80 2.67 3.50 Run-ofl (total in acre-feet). 454 7 81 350 49 159 125 1,230 Accu- racy. o No flow. Discharge measurements of station No. 62 at 2, 700 foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 18 Feet. 1.39 1.09 Sec.-ft. 8.6 May 22 2.2 Monthly discharge of station No. 62 at 2, 700 foot level near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-off (in acre-feet). Accu- racy. January.. February. March April May June July 1-18. 128 2.2 39 100 14 42 61 (a) (a) 5.3 1.5 1.8 1.3 24.6 9.95 4.67 20.5 3.82 11.0 14.2 The period. 1,510 553 287 1,220 235 655 505 4,960 a No flow. ISLAND OF HAWAII. 161 Discharge measurements of station No. 68 at 2,700-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr 18. . . Feet. 1.58 .98 Sec.-ft. 11 May 22 3 1 Monthly discharge of station No. 68 at 2,700-foot level near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Eun-oflE (in acre-feet). Accu- racy. January. . February. March April May June July 1-18. .5 7.2 2.2 3.0 2.1 15.3 1.76 5.37 17.3 6.02 11.5 13.3 941 98 330 1,030 370 684 474 The period. 3,930 Discharge measurements of station No. 69 at 2,700-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 18 Feet. 0.84 .70 Sec.-ft. 4.3 May 22 1.2 Monthly discharge of station No. 69 at 2,700-foot level near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Run-off (total in acre-feet). Accu- racy. January . . February. March April May June July 1-18. 11 1.7 10 22 3.8 10 17 0.6 .3 .2 2.8 .8 1.2 1.1 5.25 .60 1.85 7.13 1.68 3.70 4.65 323 33 114 424 103 220 166 The period. 1,380 Discharge measurements of station No. 74 at 2,700-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 18 Feet. 2.06 1.71 Sec.-ft. 12.5 May 22 4.0 97764°— wsp 373—15- -11 162 WATER RESOURCES OF HAWAII^ 1913. Monthly discharge of station No. 74 at 2,700-foot level near Hilo, Hawaii, for 191S. Month. Discharge in second-feet. Run-ofE (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. 46 4.7 23 52 24 62 56 2.9 .8 .4 1.1 3.1 4.1 3.1 18.2 2.00 5.46 16.9 7.80 14.1 16.5 1,120 111 336 1,010 480 839 589 D. D. D. r> D. D. July 1-18 D. 4,480 Discharge measurements of station No. 76 at 2,700-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 23 Feet. 1.01 Sec.-ft. 1.86 Monthly discharge of station No. 76 at 2,700-foot level near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-oflE (total in acre-feet). Accu- racy. January.. February. March AprU May June July 1-18. 10 1.0 7.8 9.3 2.0 8.7 15 0.6 .3 .2 1.0 .6 .7 .5 3.90 1.15 2.60 1.96 2.32 240 26.6 70.7 155 60.3 117 82.8 The period . 752 Discharge measurements of station No. 79 at 2,700-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 23 Feet. 0.93 Sec.-ft. 0.83 ISLAN^D OP HAWAII. 163 Monthly discharge of station No. 79 at 2,700-fooi level near Hilo, Hawaii, for WIS. Month. Discharge in second-feet. Maximum. MiniTnuTn , Mean, Run-off (total in acre-feet). Accu- racy. January... February. March April May June. July 1-18. 2.5 .2 2.3 3.2 .9 2.4 3.7 0.2 .1 .1 .1 .2 .2 .2 1.06 .15 .37 1.08 .37 .75 .93 65.2 8.3 22.8 64.3 22.8 44.6 33.2 The period. 261 Discharge measurements of station No. 80 at 2, 700 foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. height. Dis- Apr. 23. May 22. Feet. 1.22 .87 Sec.-ft. 1.71 .52 Monthly discharge of station No. 80 at 2, 700 foot level near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean, Run-ofl (total in acre-feet). Accu- racy. January.. Pebruary. March April May June July 1-18. 3.6 .6 3.7 4.0 1.6 3.6 4.5 8i 0.5 1.0 .4 .5 .4 2.04 .38 .67 2.30 .81 1.52 1.81 125 21.1 41.2 137 49.8 90.4 64.5 The period. 529 a No flow. Discharge measureTuents of station No. 81 at 2,700-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr. 23 Feet. 1.00 .69 Sec.-ft. 4.1 May 23 1.9 164 WATEE RESOURCES OF HAWAII^ 1913. Monthly discharge of station No. 8t at 2,700-foot level near Eih, Hawaii, for 1913. Month. Discharge in second-feet. Run-off (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. 12 1.4 11 15 7.0 21 38 1.0 .2 .1 3.3 1.0 1.3 3.3 5.98 .59 2.19 7.01 2.44 7.80 11.2 368 33 135 417 150 464 399 D. D D. D D. D. July 1-18 D. 1,970 Discharge measurements of station No. 85 at 2,700-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr 23 Feet. 0.88 .79 Sec.-ft. 1.90 May 23 .77 Monthly discharge of station No. 85 at 2,700-foot level near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. ,ximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. January.. February. March April May June July 1-18. 6.9 3.0 7.5 13 2.8 7.3 14 1.7 .7 1.6 .5 4.07 1.37 2.09 4.78 1.06 2.37 3.68 250 76 129 284 65 141 131 The period. 1,080 Discharge measurements of station No. 86 at 2,700-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Apr.23 Feet. 1.70 1.56 Sec.-ft. 5.1 May 23 1.6 ISLAND OF HAWAII. 165 Monthly discharge of station No. 86 at 2,700-foot level near Eilo, Hawaii, for 1913. Discharge in second-feet. Run-off (total in acre-feet). Accu- Maximum. Minimum. Mean. racy. 12 3.2 12 19 9.3 19 20 2.3 .5 .1 4.0 1.4 1.7 1.7 6.93 1.68 2.81 8.07 2.76 5.66 6.79 426 88 173 480 170 337 242 D. February . D. D. D. May D. June. D. July 1-18 D. 1,920 Discharge 'measurements of station No. 87 at 2,700-foot level near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage hei^t. Dis- charge. April 23 Feet. 1.30 1.04 Sec.-ft. 1.39 May 23 .91 Monthly discharge of station No. 87 at 2,700-foot level near Hilo, Hawaii, for 1913. Month. January . . February. March April May June July 1-18. The period. Discharge in second-feet. Maximum. Minimum. Mean 5.5 2.2 4.7 7.9 3.8 8.1 10 0.7 .4 .3 1.8 .7 1.0 .9 2.80 .74 1.19 3.77 1.61 2.93 3.52 Run-off (total in acre-feet). 172 41 73 224 99 174 126 909 Accu- racy. 166 WATER RESOURCES OF HAWAII, 1913. WAILUKU RIVER NEAR HILO, HAWAn. Location. — ^About 1^ miles west of Hilo, a short distance above Hilo Electric Light Co. intake. Records available.— March 21, 1911, to July 21, 1913. Gage. — Barrett & Lawrence water-stage recorder. Control. — Probably slightly shifting. Discharge measurements. — Made from cable. Accuracy. — Records good for January and June; for other months only fair. Discharge measurements of Wailuku River near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrograplier.] Date. Gage height. Dis- charge. Date. Gage height. Dis- charge. Jan. 9 Feet. 8.00 5.50 5.23 6.04 6.25 Sec.-ft. 703 55.4 32.5 209 254 May 6 Feet. 5.68 5.64 7.55 6.00 7.54 Sec.-ft. 157 Mar.7 May 20 152 Mar. 13 June 17 523 Apr. 7 June 25 ; 1'97 Apr. 26 July7 567 Daily discharge, in second-feet, of Wailuku River near Hilo, Hawaii, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. 1 484 364 325 265 225 195 187 1,290 1,040 1,250 3,350 1,170 2,100 3,090 3,700 1,620 1,200 814 1,630 1,450 1,400 1,180 700 525 418 347 283 236 203 172 145 127 116 104 91 87 84 89 84 78 69 64 60 62 48 44 58 84 62 50 48 44 38 38 35 34 34 33 54 88 93 84 71 66 62 122 98 84 70 69 53 107 104 57 41 43 95 127 80 59 140 166 84 66 55 50 203 219 145 568 350 323 228 165 133 201 216 148 171 187 140 611 1,620 3,110 834 630 484 378 314 264 254 269 236 203 276 246 348 273 228 211 190 250 306 254 187 165 134 116 112 106 94 85 82 103 139 426 250 326 200 160 121 98 84 84 84 82 79 78 79 78 78 94 84 100 97 87 76 72 78 80 76 69 73 9,400 6,140 3,110 1,260 568 403 314 254 203 176 158 219 203 180 139 127 152 187 700 2 657 3 568 4 .. 479 5 364 6 855 7 .. 614 8 426 9 316 10.. 264 11.. 222 12 206 13 206 14 162 15 139 16 117 17 107 18 97 19 88 20 85 21 101 22 . . 23 24 . . 25 26 27 . . 28 29. . 30 31 ISLAND OF HAW An. 167 Monthly discharge of Wailuku River near Hilo, Hawaii, for 1913. Montli. Discharge in second-feet. Maximum. Minimum. Mean Run-off (total in acre-feet). Accu- racy. January.. February. March April May June July 1-21. 3,700 127 568 3,110 426 9,400 855 145 33 41 133 78 69 85 1,010 64.6 109 432 149 806 322 62,100 3,590 6,700 25, 700 9,160 48,000 13,400 The period. 169,000 HONOLII RIVER AT KATWIKI, NEAR HILO, HAWAII. Location. — About one-half mile north of Kaiwiki and 6 miles west of Hilo. Records available. — ^June 1, 1911, to March 24, 1913. Gage. — Barrett & Lawrence water-stage recorder. Control. — Probably slightly shifting. Discharge measurements. — Made from footbridge. Accuracy. — Records good. Discharge measurements of Honolii River at Kaiwiki, near Hilo, Hawaii, in 1913. [E. O. Christiansen, hydrographer.] Date. Gage height. Dis- charge. Jan. 31 Feet. 5.10 5.11 Sec.-ft. 18.1 Mav31 19.4 Daily discharge, in second-feet, of Honolii River at Kaiwiki, near Hilo, Hawaii, for 1913. Day. Jan. Feb. Mar. Day. Jan. Feb. Mar. 1 153 86 79 56 43 42 48 430 315 299 724 196 512 840 660 16 15 12 11 11 16 30 17 13 11 11 11 10 8.6 8.6 3.4 3.4 3.0 3.0 2.8 2.8 8.6 6.2 3.8 2.8 2.4 2.0 1.8 2.0 18 16 238 182 155 358 318 268 202 108 83 65 48 38 32 27 24 17 18 40 18 14 11 9.4 9.0 7.0 7.0 7.0 5.0 3.0 3.0 12 2 17 30 3 18 86 4 19 110 5 20 37 6 21 23 7 22 103 8 23 80 9 24 35 10 25 11 26 12 .... 27 ... 13 28 14 29 15 30 31 Monthly discharge of Honolii River at Kaiwiki, near Hilo, Hawaii, for 1913. Month. Discharge in second-feet. Maximum. Minimum. Mean. Run-off (total in acre-feet). January . . . February . . March 1-24 842 50 110 17 3.0 1.8 214 12.6 24.2 13,200 700 1,150 168 WATEE KESOUKCBS OF HAWAII, 1913. HAMAKUA GROUP. HAMAKITA DITCH AT MAIN WEIR, PUUALALA, NEAR WAIMEA, HAWAII. Location. — Near head of ditch in Lalakea tract, adjacent to forest reserve and close to Kaala Mountain and Pacific Sugar Mill fence. This ditch diverts all run-off from upper headwaters of Waipio. Records available. — ^January 1 to December 31, 1913. Gage. — ^Water-stage recorder. Discharge. — Measured by weir consisting of two 5-foot panels, sharp crested, and with good BtilUng basin above. Discharge, in million gallons per day, of Hamakua ditch at main weir, at Puualala Waimea, Hawaii, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 . 3.35 2.11 4.21 2.89 2.53 1.45 1.04 .85 1.04 3.70 2.66 1.67 23.0 24.6 18.8 6.38 2.84 1.56 1.26 .95 .74 1.11 .95 .68 .68 .40 .46 .55 .37 .30 .24 1.07 .87 .44 .32 .24 12.1 11.0 2.66 1.45 .83 .65 .52 .39 4.26 4.89 1.46 7.49 10.9 20.6 10.4 10.2 8.62 3.54 1.55 2.58 13.8 3.12 1.37 0.96 .68 .54 .39 .32 .26 .26 .20 .18 .18 .13 .13 .04 5.61 2.34 5.78 8.78 4.43 4.97 2.94 11.9 16.7 4.78 3.37 4.06 2.40 4.43 24.6 11.1 13.9 16.2 8.42 7.62 3.86 6.72 3.42 5.09 8.37 2.80 9.15 8.02 20.5 24.9 22.9 15.6 10.4 10.6 10.5 10.7 8.41 5.03 4.36 5.74 7.46 5.95 8.01 4.65 7.22 8.02 3.82 2.58 2.21 3.84 6.25 5.54 2.94 1.56 .93 .64 .61 .52 .44 6.21 11.1 3.72 12.0 17.0 10.7 12.8 17.9 6.59 2.64 1.53 1.42 1.57 2.68 20.3 13.6 18.3 13.7 6.22 3.60 2.09 6.24 7.70 2.55 1.53 1.14 1.75 4.45 4.96 7.32 3.99 12.7 25.2 20.5 24.8 16.9 12.5 4.45 2.90 2.25 1.62 1.37 6.43 8.64 3.94 6.67 23.4 27.5 23.4 22.3 18.3 16.5 12.7 13.4 8.78 26.8 20.9 18.5 8.55 6.91 9.86 16.2 16.8 13.8 8.93 8.73 12.7 11.0 5.16 6.08 10.1 15.7 6.47 3.70 3.40 6.45 2.84 5.28 3.04 1.68 1.45 1.05 11.8 11.0 2.73 1.39 .85 .64 .64 1.31 1.45 7.51 21.3 21.2 11.3 19.0 6.85 2.77 1.57 1.08 .83 .92 1.45 .95 1.16 1.14 .68 .62 1.20 2.74 10.7 5.04 2.66 9.14 10.2 5.76 2.30 1.79 16.2 5.75 2.50 12.2 7.36 11.6 9.53 3.61 3.52 1.69 3.87 14.8 9.65 5.27 2.79 1.32 .68 .52 .61 .60 .30 .26 .32 .30 0.37 .30 .22 .18 .15 .23 .32 .99 1.32 .74 .37 .13 .13 .71 2.88 6.26 1.71 .60 .24 1.60 2.50 1.34 1.87 .95 .37 .15 .86 .56 '29 .'2"" 22.7 8.51 3.24 1.68 .98 18.7 20.6 16.1 22.1 17.1 10.0 6.32 18.5 24.9 30.0 15.0 12.3 13.5 13.2 9.60 14.1 14.6 12.5 10.3 3.90 2.00 1.68 1.25 2 .95 3 1.08 4 5.06 5 25.3 6 . 19.8 7 9.33 8 4.55 9 3.50 10 2.27 11 1.60 12 1.91 13 1.47 14 4.11 15 24.6 16 17.1 17 14 8 18 13 5 19. . . . 6 56 20 3 21 21 2 03 22 1 56 23 13 3 24 4 13 25 1 79 26 1 25 27 85 28 70 29 52 30 40 31 .30 Note.— No discharge Oct. 29 to Nov. 2. Monthly discharge of Hamakua ditch at main weir, Puualala, Waimea, Hawaii, for 1913. Month. Discharge in million gallons per day. Run-off (total in Maximum. Minimum. Mean. acre-feet). January 24.6 20.6 24.6 24.9 20.3 27.5 26.8 21.3 16.2 6.26 30.0 25.3 0.24 .24 .04 2.58 .44 1.14 1.45 .62 .26 .13 .98 .30 3.66 4.90 4.92 8.69 6.74 9.70 10.3 4.93 4.90 1.00 13.3 6.09 348 February 422 March 468 April 800 May 641 June 893 July 980 August 469 September 451 Octoberl-28 86 November 3-30 1,140 579 December The period 7,300 ISLAND OF HAWAII. 169 NEW HAMAKUA DITCH AT MAIN WEIR NEAR ETJKTJIHAELE, HAWAII. Location. — Near head of ditcli, about 500 feet south of office of Hawaiian Irrigation Co. (Ltd.), at Kukuihaele. Records available. — ^July 18, 1910, to December 31, 1913. Gage. — Water-stage recorder. Discharge. — ^Measured by weir consisting of six 5-foot panels, sharp crested, and with a good stilKng basin above. Discharge measurements made in ditch below weir have checked weir discharge to within 2 per cent. Diversion.- — Ditch diverts all run-off from headwaters of Waipio basin below the upper Hamakua ditch. Cooperation. — Daily-discharge record furnished by the Hawaiian Irrigation Co. (Ltd.). Discharge, in million gallons per day, of New Hamakua ditch at main weir, Kukuihaele, Hawaii, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 32.3 30.5 31.1 30.9 30.7 29.9 29.3 28.7 28.7 30.3 29.5 28.7 33.6 34.8 34.8 34.6 32.1 30.5 29.9 28.7 29.0 29.5 29.0 28.1 27.9 26.4 26.6 26.9 26.1 26.0 25.7 27.1 27.3 25.5 26.0 25.9 31.5 34.9 30.0 27.9 26.6 26.7 26.6 25.8 27.9 29.6 26.9 29.4 33.9 35.0 34.1 34.3 34.2 29.8 28.3 27.0 33.0 28.6 27.4 26.7 26.3 26.0 26.0 25.9 25.6 25.5 25.3 25.4 24.8 24.8 24.7 24.6 26.2 26.1 26.9 32.5 28.2 27.9 26.1 29.7 37.0 30.2 27.5 29.8 27.1 27.2 35.7 35.8 34.7 36.1 34.6 33.1 30.7 31.5 29.6 29.1 32.8 28.9 31.3 32.9 34.1 34.9 34.7 34.1 34.8 34.8 34.7 34.1 34.1 33.7 33.3 34.7 34.1 33.4 32.6 32.3 33.9 34.0 31.5 30.2 29.1 32.3 34.0 32.1 29.7 27.9 27.3 26.8 26.2 26.2 25.6 27.9 33.4 29.1 31.3 33.0 35.4 33.7 34.6 32.7 29.1 27.3 28.3 28.5 27.9 35.2 35.2 34.6 34.6 31.3 29.9 28.7 30.7 32.9 29.3 27.5 26.9 27.5 28.9 28.9 29.9 27.5 30.4 34.1 34.4 34.4 34.4 34.2 32.3 30.3 29.4 28.3 27.7 29.7 33.1 29.2 29.3 34.6 34.4 34.4 34.2 41.4 42.2 38.5 38.9 33.4 42.0 42.0 42.0 38.9 36.6 36.5 42.2 42.0 40.9 36.1 44.2 38.7 38.8 33.6 34.4 36.3 40.1 34.9 31.7 30.7 33.0 30.0 31.1 29.7 28.8 28.0 26.0 32.3 37.2 30.4 27.5 26.7 26.2 27.6 28.1 28.1 31.6 43.5 51.7 41.4 52.1 37.2 32.5 30.3 29.0 28.9 12.9 29.2 28.5 29.0 28.3 27.7 27.7 27.9 30.1 34.7 31.9 28.6 32.7 41.5 34.0 30.4 29.4 42.7 34.2 30.8 39.2 35.9 38.5 38.1 31.0 29.8 28.4 28.8 43.1 38.9 31.7 29.4 27.8 27.0 26.2 26.0 25.8 25.8 25.6 25.5 25.5 25.7 25.2 25.0 24.9 24.8 25.3 25.1 25.1 25.2 24.6 24.6 24.6 24.6 26.0 28.5 30.9 27.0 25.4 24.3 26.1 29.1 26.3 26.8 25.9 24.8 24.2 24.6 24.8 24.2 23.9 23.9 23.9 23.7 43.8 41.5 38.2 33.4 30.9 29.7 34.7 34.2 33.9 34.2 34.0 34.2 33.6 34.7 34.7 33.8 34.2 34.4 34.3 34.0 34.9 34.6 34.0 34.1 34.4 33.8 32.0 31.2 30 6 2 30.2 3 30 1 4 32 1 5 34.2 6 33.7 7 34 8 34 9 34.0 10 34 11 32 7 12 33.3 13 32 2 14 32.2 15 34.4 16 34.8 17 34 2 18 34.0 19 34.0 20 34.2 21 33.1 22 32.1 23 34.0 24 33.5 25 32.0 26 31.3 27 30.9 28 30.5 29 30.1 30 29.6 31 29.0 170 Monthly WATER RESOURCES OP HAWAII, 1913. 'e of New Hamakua ditch at main weir, near Kuhuihaele, Hawaii, for 1913. Montli. Discharge in million gallons per day. Run-off (total in acre-feet). Maximum. Minimum.. Mean. 34.8 25.7 29.7 2,830 35.0 25.5 29.3 2,520 37.0 24.6 28.3 2,692 34.9 28.9 33.0 3,040 35.4 26.2 30.7 2,920 34.6 26.9 30.9 2,840 44.2 28.0 36.7 3,490 52.1 12.9 31.5 3,000 43.1 25.5 31.7 2,920 30.9 23.9 25.5 2,430 43.8 23.7 33.8 3,110 34.8 29.0 32.5 3,090 52.1 12.9 31.1 34,900 Accu- racy. January February March April May June July August September October November December The year KOHALA GROUP. EOHALA DITCH NEAR EOHALA, HAWAII. Location of -weirs. — The Kohala Ditch Co. (Ltd.) maintains three weirs which measure the discharge carried by the Kohala ditch. The Awini weir is on the southeast side of the east branch of Honokanenui Gulch at an elevation of 1,880 feet. The Niulii weir is about 3J miles south of Niulii, Kohala district, at an elevation of 1,000 feet, and about 5 miles below the Awini weir. The Hawi weir is about IJ miles south of the Hawi mill near the lower end of the ditch. Records available.^ — Daily records at Awini and Niulii weirs kept by Kohala Ditch Co. July 1, 1907, to December 31, 1913. No record of flow at Hawi weir, which has been used mainly as a check on deliveries of water between Niulii and Hawi. The Niulii weir measures the amount of water shown by the Awini weir and also the inflow from the Honokanenui. The record for the Honokenenui is derived by subtracting the flow at the Awini weir from the flow at the Niulii weir. Gages.^ — Vertical staffs graduated to hundredths. Discharge ineasiirenients.— Each weir consists of three 5-foot panels with end contractions, sharp-beveled steel crest, and with very slight velocity of approach. Diversion. — Ditch diverts and delivers to the plantations on the north coast of Hawaii all low-water run-off between the Honokane Gulch and the northwest point of the island below the 2,000-foot contour. Cooperation. — Daily-discharge record furnished by Kohala Ditch Co. (Ltd.). ISLAHD OF HAWAII. Ill Discharge, in million gallons per day, of Kohala ditch at Awini weir, near Kohala, Hawaii, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. 1 12.5 11.0 11.0 10.5 11.0 10.5 8.8 9.8 10.5 12.5 10.5 10.5 20.7 20.7 20.7 13.0 12.5 11.0 9.8 9.8 8.4 8.4 7.9 7.9 5.2 5.2 5.2 4.8 4.8 4.8 4.8 9.3 9.8 7.9 6.2 4.4 10.5 14.1 9.8 7.9 4.4 4.4 3.3 3.3 9.3 8.4 6.6 11.0 11.5 14.1 11.5 8.8 8.8 8.4 6 6 6.6 14.1 8.4 6.6 4.8 4.0 3.3 3.7 3.7 3.7 3.7 3.7 3.3 3.0 2.7 2.7 2.4 2.4 2.7 2.7 2.7 3.3 3.3 3.3 7.5 12.5 7.9 4 8 4.0 4.0 3.3 12.0 10.5 7.5 12.5 12.5 11.5 8.4 6.2 6.2 7.5 9.3 6.2 5.2 7.5 12.5 15.7 15.7 15.7 15.7 15.7 14.6 15.7 14.6 14.6 12.5 11.5 12.0 9.8 10.5 9.8 14.6 13.0 10.5 9.3 7.5 8.8 8.8 7.5 7.5 7.0 6.6 5.2 4.4 4.4 4.4 6.6 15.7 15.7 15.7 14.6 14.6 11.5 10.5 8.8 7.5 6.2 4.4 4.0 4.0 12.0 15.7 12.0 13.6 10.5 7.5 2.3 ""2."i' 6.2 6.2 4.0 4.8 5.8 5.8 5.8 5.2 5.2 20.7 20.7 20.7 16.3 13.6 9.8 9.3 6.6 6.6 5.2 4.8 5.2 4.8 4.8 14.6 20.7 20.7 20.7 16.9 19.5 16.9 14.6 12.5 20.7 20.7 16.9 14.6 12.0 10.5 14.6 16.9 14.6 14.6 12.5 10.5 8.4 8.4 7.5 6.6 7.9 7.5 6.6 5.8 6.2 5.8 5.8 5.2 4.4 4.4 3.3 4.4 8.4 6.2 5; 8 5.2 4.0 4.0 3.3 4.0 4.0 16.9 20.7 20.7 16.9 15.2 12.5 7.5 5.8 4.8 4.8 4.0 3.3 2.7 4.0 2.1 2.1 2.1 2.1 5.8 5.8 5.2 3.7 4.8 4.8 3.7 3.0 6.2 6.2 5.2 6.2 7.9 7.0 7.9 6.2 4.8 4.0 3.7 7.9 11.5 7.0 5.2 4.4 3.3 2.7 1.8 1.8 1.8 1.2 1.2 1.2 0.9 .9 .9 .9 .5 .5 .5 1.5 1.2 2.1 1.5 .9 .7 .5 .5 1.5 1.2 .9 .7 .5 .5 .5 .5 .5 .5 .5 .3 .2 "ii'.h 18.3 13.6 10.5 7.0 5.2 20.1 20.1 20.1 20.1 15.2 12.0 10.5 12.0 20.1 20.1 20.1 16.3 20.1 14.6 13.6 13.6 12.5 12.5 11.0 9.8 8.4 7.5 6.6 2 9.8 3 9.8 4 10.5 5 20.7 6 20.7 7 20.7 8 20.7 9 20.1 10 19.5 11 16.9 12 14.1 13 12.5 14 11.5 15 20.7 16 20.7 20.7 18 20.7 16.9 20 14.1 21 12.5 10.5 23 15.7 24 14.1 25 . .. 12.5 26 10.5 9.8 28 7.9 6.6 30 6.2 31 6 2 Note.— No record June 2, Oct. 29 to Nov. 2. Monthly discharge of Kohala ditch at Awini weir, near Kohala, Hawaii, for 1913. Month. Discharge in million gallons per per day. Maximum. Minimum. Mean, Run-ofE (total in acre-feet). January February March April May June 1,3-30 July August September October 1-28... November 3-30. December 20.7 14.1 12.5 15.7 15.7 20.7 20.7 20.7 11.5 2.1 20.1 20.7 The period. 4.8 3.3 2.4 5.2 4.0 2.1 4.4 2.1 1.2 .2 5.2 6.2 10.1 8.39 4.89 11.5 9.14 9.63 11.3 6.85 4.72 .80 14.2 14.2 961 721 465 1,060 870 857 1,080 652 435 69 1,220 1,340 9,730 172 WATER EESOUECES OF HAWAII, 1913. Discharge, in million gallons 'per day, of Kohala ditch at Nuilii weir, near Kohala, Hawaii, for 1913. Day. Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dee. 1 12.8 12.6 12.6 11.6 12.6 11.5 9.9 10.6 12.3 13.6 10.6 11.5 5.5 6.8 6.8 13.1 11.9 11.8 10.6 10.6 10.4 10.4 10.1 10.1 10.6 10.6 10.6 9.9 9.9 9.9 9.9 11.1 11.4 10.1 10.6 10.8 13.9 13.3 11.4 10.1 10.3 10.3 9.2 9.9 10.3 10.4 10.6 12.6 13.8 13.3 13.0 12.3 12.3 11.2 9.9 9.9 13.3 11.2 10.6 9.2 9.2 8.5 8.9 8.9 8.9 8.9 8.9 8.5 8.2 7.9 7.9 7.5 7.5 7.9 7.9 7.9 8.5 8.6 8.5 10.5 14.9 10.1 9.9 9.2 9.2 9.2 13.3 13.1 12.1 15.8 12.8 12.1 11.2 11.8 11.8 11.3 11.1 9.6 9.5 11.3 13.6 11.7 11.7 11.7 11.7 11.7 12.8 11.7 12.8 12.8 13.6 12.1 12.4 12.2 12.3 12.2 12.8 13.1 12.3 12.7 11.3 13.1 13.1 11.3 11.3 11.0 10.6 10.6 10.3 10.3 10.3 13.0 11.7 11.7 11.7 12.8 12.8 16.0 16.9 14.8 12.9 10.3 10.3 9.2 9.2 12.4 11.7 12.4 13.9 11.5 10.5 6.3 ""4.'6' 11.1 11.1 9.9 9.9 10.0 10.0 10.0 9.5 9.6 6.8 6.8 6.8 11.1 13.9 10.6 10.3 9.1 10.6 11.3 9.9 11.3 11.0 9.9 9.8 6.8 6.8 6.8 10.6 8.0 10.6 12.8 14.9 6.8 6.8 10.6 12.8 12.4 11.5 12.8 10.6 12.8 12.8 10.3 11.5 13.6 12.8 12.1 12.2 14.0 14.5 13.0 10.7 12.6 11.5 11.5 12.1 11.3 11.3 9.9 10.2 12.0 11.8 11.5 10.6 9.2 9.2 9.2 9.2 9.2 10.6 6.8 6.8 10.6 12.3 12.8 12.1 10.7 9.9 9.9 9.2 9.2 9.2 9.2 9.1 8.5 8.5 9.1 10.0 10.0 9.5 8.2 8.5 8.5 8.2 8.2 10.3 11.1 10.6 11.1 14.0 11.7 11.6 9.6 8.5 7.8 7.5 14.0 16.0 10.2 8.8 8.1 7.2 7.2 6.9 7.5 6.9 6.5 7.4 7.4 6.8 6.3 6.3 6.8 7.3 7.3 6.7 7.1 7.4 14.4 8.4 9.0 8.0 7.3 7.3 6.2 6.5 6.8 7.1 7.3 7.3 7.3 7.3 8.2 8.2 6.7 6.8 7.0 6.6 6.6 6.6 6.0 6.0 14.7 9.1 13.9 10.6 9.5 8.1 6.1 7.4 7.4 7.4 12.3 13.3 11.6 11.6 7.4 7.4 7.4 11.1 7.4 12.8 13.9 13.9 14.9 14.9 16.5 13.8 12.8 11.3 9.9 2 13.0 3 12.2 4 13.1 5 6.8 6 6.8 7 6.8 8 6.8 9 . . .. 7.4 10 8.0 11 10.6 12 13.3 13 14.9 14 16.0 15 6.8 6.8 17 6.8 18 19 6.8 10.6 20 13.3 21 22 14.9 15.6 23.. . 11.7 24 13.3 25 12.8 26 13.1 27 12.2 28 11.6 29.. 11.4 30 11.1 31 11.1 Note. — ^No discharge June 2. Monthly discharge of Kohala ditch at Nuilii weir, near Kohala, Hawaii, for 1913. Month. Discharge ia million gallons per day. Maximum. Minimum. Mean. Run-off (total in acre-feet). January February March April May June 1, 3-30 July August September October November December The period (364 days) 13.6 13.9 15.8 13.6 16.9 13.9 14.9 12.8 16.0 14.4 16.6 15.6 15.8 5.5 9.2 7.6 9.6 9.2 4.0 6.8 6.8 6.5 6.2 6.0 6.8 4.0 10.7 11.3 9.53 12.0 11.9 9.34 11.7 9.89 9.30 7.38 10.7 10.8 10. < 1,020 971 907 1,100 1,130 831 1,110 941 856 702 985 1,030 11,600 ISLAND OF HAWAII. 173 KEHENA DITCH AT HONOKANE MAUKA, NEAR NORTH KOHALA, HAWAU. Location of weirs. — On 22 streams in Kehena district, beginning at head of Hono- kane Gulcli and extending northeast about 8 miles in Kohala Mountains, at elevation of 4,200 to 3,000 feet. Records available.— April 1, 1912, to March 31, 1913. Gages. — Vertical staffs; read once daily. Discharge. — Determined by means of sharp-crested weirs with end contractions. Diversion. — Ditch diverts most of the water above 2,000-foot contour. Cooperation.- — Daily-discharge record furnished by Kohala Ditch Co. (Ltd.). Cortibined daily discharge, in million gallons per day {weirs 1 to 22), of 22 streams supply- ing Kehena ditch at JSonokane Mauka, North Kohala, Hawaii, Apr. 1, 1912, to Mar. 31, 1913. Day. Apr. May. Jvine. July. Aug. Sept. Oct. Nov. Dec. Jan. Feb. Mar 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29- 30. 31. 34.23 18.65 54.24 57.50 25.03 14.76 119. 37 35.19 41.60 28.50 16.86 19.93 24.98 9.39 12.18 6.64 13.27 3.82 2.04 1.44 3.38 5.06 6.94 27.08 13.86 31.01 13.25 7.23 5.95 12.66 5.23 15.10 7.62 10.81 19.96 26.53 5.36 21.26 11.77 5.06 2.19 .97 .99 .92 .53 .53 2.39 1.26 6.05 6.11 18.91 3.89 1.54 1.14 5.86 1.65 14.35 10.02 3.93 4.70 1.84 0.83 .57 .28 .11 .09 .03 .03 1.45 16.20 11.32 20.22 6.36 10.68 4.78 3.38 22.26 13.94 6.58 23.12 8.87 13.22 4.09 2.97 22.09 4.30 1.77 5.35 1.63 1.17 7.44 2.96 4.03 5.20 3.72 5.37 3.77 28.23 4.36 11.68 3.05 4.57 3.71 1.60 9.04 2.02 .73 1.42 .92 .55 .37 .24 .64 4.52 32.66 3.51 2.79 3.33 1.46 .78 .44 .26 0.18 .19 .23 .17 .15 .14 1.29 .87 22.99 20.62 10.50 18.50 19.83 16.82 27.82 5.10 3.04 2.42 7.69 2.64 1.54 .75 .28 .15 .07 .03 .14 4.90 3.96 1.27 .70 0.76 33.71 84.81 170. 34 9.33 3.80 23. 61 5.24 2.34 1.12 .77 .62 .49 .52 .54 5.90 2.50 5.42 1.50 .59 .33 .05 .05 .05 .03 .03 13.30 7.24 2.25 4.99 3.31 .93 .31 .17 .11 .10 .40 .22 .16 7.20 3.48 1.48 2.86 1.25 7.58 1.55 3.75 1.34 25.67 33.89 6.37 3.99 62.69 19.43 23.46 6.39 10.56 9.95 2.73 1.87 1.11 1.77 1.68 1.24 1.10 21.51 105. 51 26.86 11.95 49.26 7.94 3.03 41.31 93.77 70.51 39.60 12.19 13.50 9.02 12.20 5.83 3.06 1.72 1.52 1.32 7.67 2.57 25.78 7.41 2.90 2.00 1.55 1.26 3.05 10.84 4.34 22.16 3.29 1.93 1.53 1.50 1.28 .74 .92 1.09 6.52 2.28 12.86 46.28 21.87 5.67 10.78 5.08 2.89 6.09 6.14 6.30 2.47 1.86 1.50 2.76 1.56 1.04 .82 1.06 2.06 9.28 3.54 2.05 10.41 27.97 20.71 5.10 2.36 1.54 0.50 .63 .46 .31 .30 1.22 5.09 2.33 1.07 .42 .28 .16 .51 2.22 1.06 5.86 7.45 24.81 7.87 5.86 6.38 3.51 1.27 3.99 11.18 4.60 2.01 0.89 .71 .57 .43 .33 .29 .24 .19 .18 .17 .17 .17 .17 .14 .14 .13 2.82 2.62 8.20 3.54 8.42 26.49 7.11 3.81 1.23 1.07 1.46 37.46 20.86 7.00 18.24 Combined monthly discharge of weirs Nos. 1 to 22, Kehena ditch, at Honokane Mauka, North Kohala, Hawaii, Apr. 1, 1912, to Mar. 31, 1913. Month. Discharge in mHllon gallons per day. Run-off (total in Maximum. Minimum. Mean. acre-feet). April 119.37 26.53 23.12 32.66 27.82 170. 34 62.89 105. 51 46.28 27.97 24.81 37.46 1.44 .53 .03 .24 .03 .03 .10 1.10 .74 .12 .16 .13 22.2 7.05 7.17 4.77 5.65 12.3 7.88 18.8 7.33 3.32 3.65 5.01 2,040 671 May June 660 July 454 August 538 September •. 1,130 October 750 November 1,730 December 697 January 316 February 314 March 477 The year 170. 34 .03 8.74 9,780 174 WATER EESOUECES OP HAWAII, 1913. MISCELI ANEOUS MEASUREMENTS. Measurements of streams on the island of Hawaii at points other than regular gaging stations are listed below: Miscellaneous discharge measureTnents on Hawaii for 1913. Date. Stream. Locality. Gage height. Dis- charge. Apr. 14 May 28 June 3 July 10 Apr. 14 May 28 June 3 July 10 June 21 24 July 12 Mar. 20 June 28 July 9 June 27 July 9 June 28 May 8 July 8 May 10 July 8 May 10 July 9 11 11 11 12 Jan. 8 Mar. 20 June 27 July 9 Jan. 26 PukUiae do do do Pohakunanaka do do do Upper Springs Hilo Water Supply. Small Springs do Hanawai do do Aleamai do Large spring Maili do Waipahoehoe do Kapue do Makoewai Honomu Kapahehe Waste from large spring Kawainui do do do Waipio do Near Hilo do do do do do do do Piihonua, near Hilo. do do Near Papaikou do do do do Piihonua, near Hilo. Near Hilo do Near Papaikou do do do Near Honomu do do Piihonua, near Hilo. Near Pepeekeo do do do Below Waima Below Woiawa Feet. -4.61 -4.76 -4.50 -4.62 -3.35 -3.42 -3.27 -3.33 .62 .36 .45 .51 -3.25 - .15 - .44 -3.10 -2.40 -4.24 3.02 - .69 .36 4.00 .98 («) (a) .35 .79 Sec.-ft. 27.5 n.8 29.0 28.1 5.60 3.10 7.85 4.90 2.09 .74 .75 9.9 17.3 28.0 16.6 16.2 2.54 33.5 10.5 23.7 62.6 30.6 52.8 6.94 10.8 12.4 .19 491 16 27 48 55 19 a Staff gage washed out by flood. RAIN GAGING. The rainfall of the Hawaiian Islands is extremely variable, ranging from a few inches at several low-level, leeward localities to more tlian 600 inches per annum, usually at elevations above 2,000 feet and on the windward sides of the islands. Valleys lying on the same sides of the islands and within a few miles of each other may have a varia- tion in mean annual precipitation of several hundred per cent. The rainfall may also vary greatly in the same valley for different eleva- tions. As a rule the zones of heaviest precipitation are on the windward sides of the islands, 2,000 to 3,000 feet above sea level. Generally the daily raia gages maintained by the United States Weather Bureau are located at low levels. Lack of funds and the absence of inhabitants at high-level localities have prevented the maintenance of Weather Bureau stations at high levels, although in a number of cases daily records are furnished that bureau by occu- pants and caretakers of mountain houses and ranches. The data furnished by the Weather Bureau are therefore generally of little value in their relation to stream run-off. KAIN GAGING. 175 When high levels have been accessible and funds available high- level rain gages, which are read monthly and bimonthly, have been established by this ofl&ce and some valuable records obtained. To determine the precipitation of the Territory accurately would require the installation of thousands of gages and the construction of hun- dreds of miles of trails. Acknowledgment for cooperation in furnishing rainfall data is due the following: Kauai — Kekaha Sugar Co., Makee Sugar Co., Hawaiian Sugar Co., Grove Farm Plantation, W. F. Sanborn of Princeville Ranch, Kauai Electric Co., and J. McClellan — Oahu, C. C. Bitting, F. Meyer, and Hawaii Preserving Co.; Maui — Wailuku Sugar Co., Honolulu Ranch, Hawaiian Commercial & Sugar Co., Maui Board of Supervisors, Pioneer Mill Co., and Olowalu Sugar Co.; Hawaii — Hawaii Mill Co., P. W. P. Bluett, W. S. May, C. F. Clark, C. R. Wil- lard, Alex. Valentine, Honokaa Sugar Co., Pacific Sugar Mill, Hawaiian Irrigation Co., and Kukaiau Ranch Co. The tables on pages 180-185 show the precipitation at stations main- tained by the Geological Survey and precipitation data furnished from private sources which are not included in United States Weather Bureau records, to which those interested in further data are referred. Rainfall stations in Hawaii. 1. Kokee, on mesa one-half mile above Knudsen's camp near head of Kokee Stream and about 19 miles north of Waimea; 3,550 feet above sea level. 2. Puu Lua, near wagon road from Kekaha to Halemanu, about 12 miles north of Waimea; 3.500 feet above sea level. 3. Lehuamakanoi, about 22 miles by road and trail north of Waimea; 3,932 feet- above sea level. 4. Paukahana, about 21 miles north of Waimea by road and trail; 3,723 feet above sea level. 5. Waiakoali, a,bout 22 miles by road via Halemanu north of Waimea; 3,450 feet above sea level. 6. Kilohana, near Alakai swamp, about 23 miles by road and trail north-northeast of Waimea; 4,023 feet above sea level. 7. Mohihi, on ridge at head of Mohihi Valley and about 23 miles by road and trail northeast of Waimea; 3,500 feet above sea level. 8. Mohihi- Koaie divide, on ridge about 24 miles by road and trail north of Waimea; 3,950 feet above sea level. 9. Waialae, near Kaholuamanu; 14 miles by road and trail north of Waimea, near Waialae gaging station; 3,600 feet above sea level. 10. Hukipo, 3 miles northwest of Waimea; 400 feet above sea level; records furnished by Kekaha Sugar Co. 11. PaU trail, one-half mile mauka of Kekaha ditch where trail crosses and about 2 miles mauka from Waimea; 850 feet above sea level; records fm-nished by Kekaha Sugar Co. 12. Camp No. 7, about 2 miles northeast of Waimea; 150 feet above sea level; records furnished by Hawaiian Sugar Co. 13. Waimea, in Mr. J. McClellan's yard; 10 feet above sea level; Mr. McClellan aids in obtaining record. 176 WATER EESOURCES OP HAWAII, 1913. 14. Kaholuamanu, about 12 miles by road and trail northeast of Waimea; 3,650 feet above sea level. 15. Kabana, near Halekua camp, on ridge about .16 miles by road and trail via Kabo- luamanue from Waimea; 3,750 feet above sea level. 16. Keanakua, near Halekua camp, on ridge about 16 miles by road and trail nortb- northeast of Waimea; 4,450 feet above sea level. 17. Olokele mauka, on ridge on left side of Olokele Stream above intake of Olokele ditch, and about 18 miles by road and trail from Waimea; 2,100 feet above sea level; records furnished by Hawaiian Sugar Co. 18. Waialeale, on summit of ridge at headwaters of Hanapepe, Wainiha, Hanalei, and Olokele streams, and North and South Forks of Wailua River; about 25 miles by road and trail northeast of Wa.unea; 5,075 feet above sea level. 19. Camp No. 2, about 2 miles northwest of Hanapepe and 7 miles southeast of Waimea; 250 feet above sea level; records furnished by Hawaiian Sugar Co. 20. Hanapepe Valley, on left bank of Hanapepe ditch, 3 miles above Koula, and about 8 miles north of Eleele; 530 feet above sea level; records furnished by Hawaiian Sugar Co. 21. Hiloa-Manawaiopuna divide, on ridge between east and west branches of Hana- pepe Stream, about 10 miles northeast of Eleele; 2,080 feet above sea level. 22. Aakukui, near plantation camp, about 5 miles southwest of Lihue; 350 feet above sea level; records furnished by Grove farm. 23. Waiahi, on South Wailua River, near Lihue Electric Co.'s power plant, 7 miles from Lihue; 600 feet above sea level. 24. Hanahanapuni, on ridge near Kauai Electric Co.'s power line, about 10 miles northwest of Lihue; 911 feet above sea level. 25. North Wailua, near Waialeale Pali, in North Kailua Valley, about 15 miles by road and trail northwest of Lihue; 1,250 feet above sea level. 26. Pohakupili, on top of narrow ridge about 6 miles west of Kealia; 2,590 feet above sea level. 27. Puu Eu, on ridge about 6^ miles west of Kealia; 2,748 feet above sea level. 28. Kaneha, at gate tender's house near the mauka Kaneha reservoir, and about 5 miles northwest of Kealia; 800 feet above sea level; records furnished by Makee Sugar Co. 29. Summit Camp (Wainiha ridge), Hanalei; about 30 feet southwest of house at Summit Camp on power line; 6 miles from Kapaka; 1,900 feet above sea level; gage read by employee of Kauai Electric Co. 30. Kapaka, at Lineman's camp, about 50 feet north of house, and 5 miles south of Hanalei; 635 feet above sea level; gage read by employee of Kauai Electric Co. 31. About 40 feet north of Sanborn's residence, 2 miles from Hanalei; 105 feet above sea level; records furnished by Princeville ranch. 32. About 50 feet below Kauai Electric Co.'s power house, at taibace, 7 miles west of Hanalei; 125 feet above sea level; records furnished by Kauai Electric Co. 33. Intake of Wainiha Power Co.'s canal, 6 miles back of Hanalei; 700 feet above sea level; records furnished by Kauai Electric Co. 1. Nuuanu Pali, on the water reservation, near the Pali road, about 200 yards toward Honolulu from top of the Pali; 1,200 feet above sea level. 2. Summit of Konahuanui, southeast of Nuuanu Pali, about 6 miles in air line northeast of Honolulu; 3,100 feet above sea level. 3. Near summit of Mount Olympus, back of Manoa Valley, about 6J miles in air line northeast of Honolulu ; 2,400 feet above sea level. 4. Waiomao, on the property of C. C. Bitting, lot No. 8, Palolo Valley, Honolulu; 600 feet above sea level; records furnished by C. C. Bitting. EAIN GAGING. 177 Kaau crater, on trail from Mount Olympus, a short distance before it l(!ads down the ridge into Palolo Valley and about 3 J miles north of Kaimuki car line; 1,700 feet above sea level. On the ridge between the Waiahole and Waiawa portals of the Waiahole Water Co.'s tunnel, near "Waiahole, Waikane, Oahu; 2,150 feet above sea level. Makaha, near Waianae, on property of Waianae plantation; 1,300 feet above sea level; records furnished by F. Meyer, manager Waianae plantation. About 150 yards downstream on left bank of North Fork of Kaukonahua stream from Waialua Agricultm'al Co.'s ditch intake, on trail 8 miles north of Wahiawa; 1,200 feet above sea level. Near the office of the Hawaiian Preserving Co., Wahiawa; 940 feet above sea level; records are furnished by Hawaiian Preserving Co. 1. In H. B. Penhallow'syard, Wailuku; 390 feet above sea level; records furnished by Wailuku Sugar Co. 2. Yard at Wailuku Sugar Co.'s office, Wailuku; 175 feet above sea level; records furnished by Wailuku Sugar Co. 3. Right bank of lao Stream at the gaging station, 20 feet from the north anchorage of the cable; 3 miles west of Wailuku; 830 feefc above sea level. 4. lao Valley on small plateau or tableland between north and south branches of lao Stream, about 1 mile above the junction; about 4 miles west of Wailuku; 1,500 feet above sea level. 5. About 1,000 feet below small cave in lao Valley, on ridge between north and south branches of lao Stream; about 5^ miles west of Wailuku; 1,720 feet above sea level. 6. Waiehu, at T. Burlem's house on old Spreckels ditch just south of South Waiehu Gulch, 2 miles northwest of Wailuku; 200 feet above sea level; records furnished by Hawaiian Commercial & Sugar Co. 7. Waihee, on roof of building formerly used as plantation office; 3 J miles from Wailuku; 125 feet above sea level; records furnished by Wailuku Sugar Co. 8. Waihee Gulch, on right bank of the stream, about 100 feet below lower develop- ment tunnel; about 5J miles from mouth of gulch and 3 miles above intake of Waihee canal and the Waihee gaging station; 1,500 feet above sea level. 9. Rim of extinct crater of Mount Eke; 14 miles by trail from Honokahau; 4,500 feet above sea level. 10. Honokahau Gulch at ditchman's house on left bank of stream, 150 feet below ditch intake; about 8 miles from Honokahau; 800 feet above sea level; records fm'nished by Honolua Ranch Co. 11. Camp on ridge between Honokahau and Kahakuloa gulches beside trail leading to top of Mount Eke; about 12 miles from Honokahavi; 2,300 feet above sea level. 12. Honokahau ditch about one-half mile south of Honokahua Gulch and about 4 miles from Honokahau; 760 feet above sea level; records furnished by Honolua Ranch Co. 13. Honokawai Gulch at junction with Amalu Stream; on trestle supporting Hono- kawai flume about 1,000 feet below intake; about 3|- miles from Kaanapali and 7^- miles from Lahaina; 1,500 feet above sea level; records furnished by Pioneer Mill Co. 14. West slope of Puu Kukui, about one-half mile south of Honokawai Gulch; about 4-| miles east of Kaanapali and 8^ miles from Lahaina; 2,500 feet above sea level; records furnished by Pioneer Mill Co. 15. West slope of Puu Kukui at top of left bank of Honokawai Gulch; about 6 miles east of Kaanapali and 10 miles from Lahaina; 5,000 feet above sea level; records furnished by the Pioneer Mill Co. 97764°— wsp 373—15 12 178 WATER EESOUECES OF HAWAII, 1913. 16. Olowalu Sugar Co.'s mill in Olowalu; 10 feet above sea level; records furnislied by Olowalu. Sugar Co. 17. Olowalu Gulch (mauka) on right bank of Olowalu Stream about 3 J miles north of Olowalu; 600 feet above sea level; records furnished by Olowalu Sugar Co. 18. Waikapu Gulch, on left bank of the South Branch of Waikapu Stream, about 4 miles by trail from Waikapu and 6 miles from Wailuku; 1,535 feet above sea level. 19. Olinda, on Kula pipe line; 4 miles east of Makawao; 4,000 feet above sea level; records furnished by Board of Supervisors, County of Maui. 20. Waikamoi Gulch, on Kula pipe line at reservoir; 3 miles from Olinda and 7 miles from Makawao; 4,200 feet above sea level; records furnished by Board of Super- visors, County of Maui. 21. Puohakamoa, on Kula pipe line about 1,000 feet below intake at Puohakamoa Gulch; 4 miles east of Olinda and 8 miles from Makawao; 4,300 feet above sea level; records furnished by Board of Supervisors, County of Maui. 22. Camp No. 1 of Hawaiian Commercial & Sugar Co., near Spreckelsville, 5 miles east of Kahului; 50 feet above sea level; records furnished by Hawaiian Commer- cial & Sugar Co. 23. Camp No. 7 of Hawaiian Commercial & Sugar Co., near Kihei, about 5 miles south of Puunene; 50 feet above sea level; records furnished by Hawaiian Commercial & Sugar Co. 24. Puunene, at Hawaiian Commercial & Sugar Co.'s office; 50 feet above sea level; records furnished by Hawaiian Commercial & Sugar Co. 1. Near flume at camp No. 8 of Waiakea plantation, near Waiakea; 1,500 feet above sea level; records furnished by Waiakea Plantation Co. 2. Camp No. 6, at plantation camp back of Waiakea; 800 feet above sea level; records furnished by Waiakea plantation. 3. United States Engineer's office at Hilo breakwater, Hilo; 15 feet above sea level; records furnished by United States Engineers' office. 4. Piihonua, at office and store of Hawaii Mill Co., near Hilo; 915 feet above sea level; records fiurnished by Hawaii Mill Co. 5. Hilo, in rear of J. T. Lewis's residence, Waianuenue Street; 60 feet above sea level. 6. Station No. 1, about 50 feet in rear of Alex. Valentine's house at Wainaku camp of Hilo Sugar Co.; 200 feet above sea level; records June 30 to November 30 furnished by Alex. Valentine, of Hilo Sugar Co. 7. Station No. 2, at Antone Mogordo's blacksmith shop near Kaiwiki road, and about 1 mile above the Wainaku camp of the Hilo Sugar Co. ; 1,000 feet above sea level. 8. Station No. 3, near Kaiwiki, on trail from mauka end of Kaiwiki road to 2,700-foot camp, and about 600 feet above end of road; at lower edge of timber; 1,500 feet above sea level. 9. Station No. 4, on trail from mauka end of Kaiwiki road to 2,700-foot camp, in timber belt; 2,000 feet above sea level. 10. Station No. 5, about 3J miles above Kaiwiki,' near Hilo; 2,650 feet above sea level. 11. Station No. 6, at camp, on east slope of Mauna Kea, in heavy timber belt; 3,000 feet above sea level. 12. Station No. 7, on east slope of Mauna Kea, in heavy timber belt; 3,500 feet above sea level. 1 Gage originally located at elevation of 2,500 feet by H. R. Schulz; later moved to elevation of 2,650 feet; thought to be 2,500 feet by C. H, Pierce, July 1, 1911, WATER RESOURCES OF HAWAII, 1913. 179 13. Station No. 8, on east slope of Mauna Kea, in heavy timber belt; 4,000 feet above sea level. 14. Station No. 9, on eaet slope of Mauna Kea, in heavy timber belt; 4,500 feet above sea level. 15. Station No. 10, on east slope of Mauna Kea, in heavy timber belt; 5,000 feet above sea level. 16. Umikoa, on property of Kukaiau Ranch Co. (Ltd.), near ranch house; 3,400 feet above sea level; records furnished by Kukaiau Ranch Co. (Ltd.). 17. Puukihe, on top of Kihe hill on the side of Mauna Kea, about 10 miles south oi Kukaiau; 7,822 feet above sea level; records furnished by Kukaiau Ranch Co. (Ltd.). 18. Reservoir No. 13, on land of Honokaa Sugar Co., near Honokaa; 1,480 feet above sea level; records furnished by the civil engineers' office of Honokaa Sugar Co. and Pacific Sugar Mill. 19. Near Honokaa, at office of civil engineers for Pacific Sugar MQl and Honokaa Sugar Co.; 1,120 feet above sea level; records furnished by civil engineers. 20. Ahualoa homesteads, at ditch tender's house, near the Parker ranch, Honokaa; 2,551 feet above sea level; records furnished by civil engineers' office of Honokaa Sugar Co. and Pacific Sugar Mill. 21. Waima, in Waipio Valley along the line of lower Hamakua ditch, near Kukuihaele; 980 feet above sea level; records furnished by Hawaiian Irrigation Co. 22. Lower Koiawe, near the line of the lower Hamakua ditch in Waipio Valley near Kukuihaele; 1,000 feet above sea level; records fiu-nished by Hawaiian Irriga- tion Co. 23. Upper Koiawe, along the line of the upper Hamakua ditch, Waipio Valley, near Kukuihaele; 3,350 feet above sea level; records furnished by Hawaiian Irriga- tion Co. 24. Alakahi- Waipio, in Waipio Valley, Kohala Mountains, along the line of the lower Hamakua ditch, near Kukuihaele; 1,030 feet above sea level; records furnished by Hawaiian Sugar Co. 25. Alakahi- Waipio, in Waipio Valley, Kohala Mountains, near the line of the upper Hamakua ditch; 3,870 feet above sea level; records furnished by Hawaiian Irrigation Co. 26. Lower Kawabiui, in Waipio Valley, near the line of the lower Hamakua ditch, near Kukuihaele; 1,040 feet above sea level; records furnished by Hawaiian Irrigation Co. 27. Upper Kawainui, in the Kohala Mountains, near the line of the upper Hamakua ditch, near Kukuihaele; 4,080 feet above sea level; records furnished by Hawaiian Irrigation Co. 28. Honokane mauka; in the Kohala Mountains, near the intake of the Kehena ditch, near Kohala; 3,800 feet above sea level; records fiu'nished by Kohala Ditch Co. 29. Kaaiihuhu, on property of W. S. May, about 3 miles northwest of Hawi; 1,400 feet above sea level; records furnished by W. S. May. 180 WATER RBSOUECES OF HAWAII, 1913. w a * fe s-^ CD CO CO CO O CO CO CO CO N W (M N -* CO CD CD CO C<» IM CO CD CO CD CO CD CO N OCO OCO _ i-H CO-* cocooooooooootMoi cnco 00 »0 tH t^ CO CO CO 00 O 00 OiC^I ■* •* CO t^ C~ T-l 00 00 00 .-I r-IlN iraoOOCO iO0 050 I-H l-H •* Ttl (N rH O U3 (N Ot-H rH 05 00 IM iO Oi »o »o OOO s ?s s s oo T-IO 00 00 00 ■* Tt* «3 05 lO i-H OOO CO C> : >. >. >. >. „ .. „ . - ■53^c3S : C3 ^ ■ o '.qo 'K '.yot>0 « S,-i ri'SS'S S)5 » MS SrfS5 £ Si's 5 £ci5 ,g ' I ^02 .' ^012 d 2.g .' ; ^oa-? prr, : ■ ■ 'o :o M 00 : :o So COCOCOcOr-l 05 03 05 05T— ( r-HCO I-H OS COCO ^ O O-i T-HCO _r' »o ~ 5r-lO HOii-H 5.-I05 -00 - COCOCO ci d d o » 00 OS O T-1 OS CO 00 00 o o o OS s- s lO s oo lO N CO >o s £ 8 lO t^ OS S5 8 CO g s§ (N 02 lO CO s ^ s OS CO s Tfl 00 ^ U3 o ^ CO §§ g3 s c5 o CO lO I>- o CO l:~ U5 s l> r- lO O CO s? ■* OS OS o ;:; in IN (N § 00 g s o 00 I> CO- O CO § s S g OS r- OS ■* 00 CO >> "C !aoo _ S !i< ^ CO ^ c-s w- ■ —> 5 fl •- 'S <: ecjcs-HgHo!^ M CQ Ph 3 c3 . |o P, CQ S CO CO CO .-I CO CO OT|! 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(N (M CO tH cq^'^coc^icococ^ ICCO 00 »0 (^ 03 OOIM 1-H CDco" N N CO lO ■* 05 O lO 0>0 CO lo CD cq -* coco T-l T-i r-t 1-1 IN 1-1 Ol CO cq -* CO "3 CO CO -*i.-^ ■* Oco 1QOOOOO(N(N •* (NCqc003»Or--ioif50"3lOCO O "3 00 i-l OS CD ,-1^ ,-l,^i__ICMCCI lO lO CO lO CO CO CO »0 -^il OCDOOOO^C0 iH iH 00 03 00 iOCO 00 coco < N 1-1 CO IOCS 00 <3l COtH •* CO i-lt~ CD tA 00-* ■* 1-c "OO 05 i^J^ coco CO O lOCN (N(N00COCO(N C<1 CDCD40<0;DCDOO»0*OOCO ~"o *^ O CDC^ O 00 c^ooooococococq0 ' CO CO CO i-< CO CO CO ^o'ddodgoooo" IP S : : : : :« fi 1^ p ofcrH ;c5 o O OS fi ft 5JOcocoJ2m 0> "^ 1-1 -^ '"' — I H . 3 Z '^ t-s 1-5 ^ ^i; i-T o> .^i-T^^T-i ^ '"'o I-T « I-T CO J2 P 3S en ^' P M P ^- m ^ O 03 ^ V ^ 7-1 1-1 03 03-2 -^0^2 03 S '-' ■ " »-< " s p «^ O i-H iCO"^ ow Occ^ (D « ffl >"• tc OS 2 -MOO il^sSiz; 1-^ ' ^\ 03 03 ca 3 S "* "3 'S BSSg c3^ C3^ •°gs .2^ J i-iiNconH'iocDi^odoiSggci) ^ ft^g S a '^ onnooooriori S^ "^ <" » O i-< o * 1-H ® fto? ■-fa I ws I o o ] a a ; o o o o o o c c c c "en » Oi-< o^ a a .2 » •2. 42- ft^ .S "-1 .2 '"' S o ^ ■q.3 2.2.2.2 03 03 c3 03 ■■S'-S'5'5'S-5 3 3 «c5o6 > « ^3 mmui W Bh pel _g OO ^g o6 ^ w, 03 . 03 ., C3 CO p p <^ CO** »0 CD ^- 00 03 O i-( C^ CO ■* IC CO P P MM CD t-^ 00 ai C^ CN W C^» 184 WATER RESOURCES OF HAWAII, 1913. Maximum precipitation, in inches, at rainfall stations maintained during 1913. Kauai. - Month. 13. Waimea. 20. Hanapepe Val- ley near Koula, 29. Summit camp, Hanalei. 30. Kapaka. Rainfall. Maxi- mum in 24 hours. Rainfall. Maxi- mum in 24 hours. Rainfall. Maxi- mum in 24 hours. RatofaU. Maxi- mum in 24 hours. 1.20 1.96 .21 4.51 2.95 1.23 .37 .78 6.10 2.18 .09 0.70 .73 .19 2.32 2.75 .81 .11 .15 3.81 1.73 .06 9.08 3.54 5.05 11.26 9.42 10.92 7.73 10.44 3.66 14.18 25.61 .69 1.74 .65 .66 2.19 2.98 4.50 1.28 1.96 .72 2.63 4.97 .29 17.92 8.93 15.49 17.04 21.47 14.47 12.27 11.91 8.95 13.80 31.16 7.81 2.21 2.65 2.46 2.24 7.00 4.62 1.62 1.09 1.69 1.39 3.82 2.55 9.82 7.84 11.57 7.43 10.46 8.53 9.03 7.67 5.08 6.93 19.10 9.49 1.42 2.00 1 83 1.36 2.30 1.78 July 1.22 .86 .68 October 1.58 2.87 3.62 For 1913 Estimated evapora- 21.58 2.00 3.81 111. 58 2.00 4.97 181. 22 2.00 7.00 112.95 2.00 3.62 23.58 113.58 183.22 114.95 Kauai. Oahu. Month. 32. Powerhouse near Wainiha. 33. Intake of Wainiha canal. 7. Makahanear Waianae. 9. Hawaiian Pre- serving Co. 8.39 10.50 12.41 10.51 5.22 5.44 6.92 7.21 3.16 5.22 17.34 8.65 2.76 2.85 2.75 1.61 1.43 .99 1.97 .81 .81 1.77 1.89 4.39 6.91 6.01 27.99 13.68 7.25 10.22 11.83 9.54 5.20 9.18 28.03 8.81 1.69 1.05 9.40 2.61 1.55 1.65 2.60 1.16 1.47 3.35 4.90 3.18 5.95 3.43 6.26 3.94 13.62 6.69 1.39 4.02 4.22 8.80 7.78 12.41 1.64 1.30 4.00 1.90 6.40 3.00 .64 2.60 2.60 4.70 2.21 9.14 February 2.32 4.00 5.32 2.36 3.57 3.61 4.76 5.78 .82 0.59 .51 May 1.76 July 1.00 August .85 .37 October 1.30 November. 1.27 .32 For 1913 Estimated evapora- tion 100.96 2.00 4.39 144.65 2.00 9.40 78.41 2.00 9.14 32.44 2.00 1.76 102. 96 146. 65 80.41 34.44 Month. Hawaii. 4. Piihonua. 18. Reservoir No. 13. 19. Near Honokaa. 20. Ahualoa home- steads. January. . . February . March April , June July August September. October November. December. . 11.61 18.08 10.77 15.19 12.50 12.95 6.16 6.54 43.14 9.16 For 1913 Estimated evapora- tion 146.1 2.0 1.96 1.95 3.20 6.00 1.76 2.40 1.10 1.71 6.00 2.07 3.48 9.31 3.15 3.19 3.98 2.40 1.82 4.46 5.05 .63 16.83 17.42 .00 71.62 2.00 73.62 1.27 3.00 1.16 1.16 1.12 1.25 .45 .85 1.85 .12 3.62 6.00 2.96 6.54 2.80 7.95 4.62 2.32 1.77 4.36 2.86 .50 17.63 21.67 6.00 75.98 2.00 77.98 0.80 2.00 .82 1.73 1.80 1.68 .93 1.08 .70 .25 3.35 9.20 2.03 3.72 1.98 6.68 6.20 3.02 2.42 4.28 2.81 .59 25.78 16.95 9.20 75.46 2.00 77.46 0.54 .72 .72 1.47 1.75 .77 1.05 .66 .80 .14 7.06 6.37 7.06 EAIIT GAGING. 185 Maximum 'precipitation, in inches, at rainfall stations maintained during 1913— Contd. Hawaii. Month. 21. Waima. 22. Lower Koiawe. 23. Upper Koiawe. 24. Alakahi-Waipio, lower. January 4.45 4.44 4.67 6.77 6.58 7.41 4.37 4.86 3.96 1.49 18.13 14.04 1.14 1.22 .75 1.36 .95 1.55 1.10 .90 .96 .40 4.20 4.30 5.39 7.61 9.49 12.35 12.98 15.45 8.45 9.58 9.62 2.97 33.83 25.29 1 57 1.58 March 1 83 5.92 5.09 6.33 3.62 4.06 2.96 .67 19.82 11.23 1.20 .95 1.50 1.00 1.30 .88 .25 5.20 6.20 7.60 10.10 13.50 5.08 9.00 3.38 2.63 22.76 8.93 1.00 2.00 2.10 .60 1.70 .57 .65 4.55 2.35 3.10 May. . . 1 75 June 2.89 July 1.75 1 74 September 3.52 October .49 6 92 December 9 25 For 1913 Estimated evapora- tion 59.70 2.00 6.20 81.17 2.00 4.30 82.98 2.00 4.55 153.0 6.0 9.25 61.7 83.17 85.0 159.0 Month. Hawaii. 25. Alakahi-Wai- pio, upper. 26. Lower Kawai- nui. 27. Upper Kawai- nui. 29. Kaauhuhu. January February March April May June July August September October November December For 1913 Estimated evapora tion 4.87 9.15 9.55 19.72 10.42 16.97 13.30 1L72 7.28 4.27 41.30 .14.85 163.4 6.0 169.4 1.60 1.65 2.10 3.65 2.01 2.60 2.21 2.30 1.40 .60 8.50 4.55 8.50 131. 87 2.00 133.9 0.97 1.22 1.40 1.60 1.15 2.20 1.20 1.80 1.50 .45 8.00 11.03 10.41 11.39 15.73 28.82 14.64 24.54 20.92 18.46 13.75 6.17 56.62 18.86 11.03 240.3 6.0 246.3 3.90 L75 3.63 4.50 2.10 3.05 3.63 3.32 3.15 .73 13.32 5.87 2.60 4.71 2.29 6.39 3.72 6.56 4.00 3.34 2.51 2.01 11.53 10.10 13.32 59.76 2.00 1.17 .66 .45 L32 .89 1.26 1.90 .98 L02 ,45 2.02 L94 2.02 Precipitation at rainfall stations maintained on Hawaii during 1911 and 1912. Month. 16. Kukaiau ranch. 17. Puukihe. 1911 1912 1912 Inches. 12.49 43.44 3.30 11.74 9.49 3.24 2.53 3.69 3.77 3.39 4.72 5.71 Inches. 22.04 10.61 13.15 1.93 .11 .67 1.42 1.47 4.55 6.53 1.51 Inches. June July September December Year a 107. 5 O64.0 6 38.7 o Two inches should be added for estimated evaporation. 6 Includes 6 inches estimated evaporation. INDEX. A. Page. Acre-foot, definition of. 15 Akulikuli Spring near Kealia, Kauai 60-61 AIo Stream near Huelo, Maui 137 Anahola ditch at Kiokala, near Kealia, Kauai 64-65 Anahola River above dam at Kiokala, near Kealia, Kauai 63-64 Appropriation, character and purpose of 7-8 Austin, H. A. R., work of 22 Authority for work 7-8 B. Bailey, C. T., work of 22 Bitting, C. C, cooperation of 175 Bluett, P. W. P. , cooperation of 175 Bridge station, definition of 14 C. Cable station, definition of 14 Christiansen, E. O., work of 22 Clark, C. F., cooperation of 175 Computations, accuracy of 21 methods of obtaining 17-20 Conservation fund, levying of 7-8 Cooperation, terms of 8-9 Cross-section, determination of 11 Current-meter, description of 11 D. Definition of terms 15-16 Discharge, methods of computing 17-20 Discharge measurements, accuracy of 20-21 tables of, explanation of 21 Division of work 22 Dort, J. C, work of 22 Dort, S. W., work of 22 E. East Branch or Fork. See name of main stream. East Maui, list of stations on 25-26 Eleele, Kauai, Hanapepe River near 37-38 Hanapepe ditch near 40-41 Hiloa ditch near 38-40 Equivalents, convenient 15 G. Gages, method of installation 14 Gaging stations, classes of 10 kinds used 13-14 list of 22-27 records of 27-151 Gallons per minute, definition of 15 Goo, E. E., work of 22 Goo, R. M. S., work of 22 Grove Farm Plantation, cooperation of 175 H. Page. Halpuaena Stream near Huelo, Maui (old and new stations) 134-135 Halekua Stream near Waimea, Kauai 32-33 Hamakua ditch at main weir, Puualala, near Waimea, Hawaii 168 Hamakua group, Hawaii, stream-flow meas- urements on 168-170 Hanalei, Kauai, Kuna ditch near 68-69 Hanalei River near Hanalei, Kauai 67-68 Hanamaulu ditch near Lihue, Kauai 48-49 Hanamaulu River at Kapaia near Lthue 45-46 Hanapepe ditch near Eleele, Kauai 40-41 near Hanapepe, Kauai 41-42 Hanapepe River at Koula, near Eleele, Kauai 37-38 Hardy, W. v., work of 22 Hawaii, conditions in various districts of. 152-153 list of stations on 26-27 miscellaneous measurements on 174 rainfall stations on 178-179 stream-flow records on 153-174 table showing precipitation on 183 Hawaii Mill Co. , cooperation of 175 Hawaii Preserving Co., cooperation of 175 Hawaiian Commercial & Sugar Co., coopera- tion of. 175 Hawaiian Irrigation Co. , cooperation of 175 Hawaiian Sugar Co., cooperation of. . ^ 175 Hilo, Hawaii, Honolii River at Kaiwiki, near. 167 stations at 2,700-foot level, near 153-165 Wailuku River near 166-167 HUoa ditch near Eleele, Kauai 38-40 Honokaa Sugar Co., cooperation of 175 Honokahau, Maui, Honolua Stream near . . 117-118 Kahakuloa Stream near 113-114 Honokahau ditch at intake, near Honokahau, Maui 116 Honokahau Stream near Honokahau, Maul 115-116 Honokawal ditch near Lahaina, Maui 119-120 Honokawai Stream near Lahaina, Maui 118 Honolii River at Kaiwiki, near Hilo, Hawaii. 167 Honolua Stream near Honokahau, Maui. . . 117-118 Honolulu, Oahu, East Branch of Manoa Stream at upper Manoa Valley, near 82-83 Kahuawai Spring near 79 Kalihi Stream at Kioi Pool, near 74 Lulumaha ditch at upper Nuuanu reser- voir, near 76-77 Manoa Stream near 80-82 Nuuanu Stream at Luakaha weirin upper Nuuanu Valley, near 75 below reservoir No. 2 wasteway, near 75-76 187 188 INDEX. Honolulu, Oahu, Pauoa Stream at upper Pauoa Valley, near 78-79 Waiomao Stream at upper Palolo Valley, near 85-86 West Branch of Manoa Stream at upper Manoa Valley, near 84^85 Honolulu Ranch, cooperation of 175 Honopou Stream near Huelo, Maul 149-151 HoolawaliiUi Stream near Huelo, Maui 148-149 Hoolawanui Stream near Huelo, Maul 147-148 Huelo, Maui, Alo Stream near 137 Haipuaena Stream near (old and n^w stations) 134-135 Honopou Stream near 149-151 HoolawaliiUi Stream near 148-149 Hoolawanui Stream near 147-148 Kailua Stream near 145-146 Nailiilihaele Stream near 144-145 Oanul Stream near 146-147 Oopuola Stream near 139-140 Puohakamoa Stream near (old and new stations) 135-137 Spreckels ditch near 141-144 Waikamoi Stream near 138-139 Huleia River near Lihue, Kauai 43-44 I. lao Stream near Wailuku, Maui 104-105 Integration method, use of 12-13 Investigations, authority tor 7-8 scope of 3 K. Kaehulua Stream at Kuhinoa weir, near Kealia, Kauai 57-58 Kaehulua Stream, North Fork, at Kainahola weir, near Kealia, Kauai 58-59 Kaehulua Stream, South Fork, at Waina- muamu weir, near Kealia, Kauai. 56-57 Kahakuloa Stream near Honokahua, Maui. .113-114 at Kahakuloa, near Waihee, Maui 113 KahanaJki Stream, North Branch, in Kailua Valley, near Kailua, Oahu 96-97 Kahanaiki Stream, South Branch, in Kailua Valley, near Kailua, Oahu 96 Kaheaku, John, work of 22 Kahoma ditchat weir, near Lahaina,Maui. 121-122 Kahuawai Spring at upper Pauoa Valley, near Honolulu, Oahu 79 Kailua, Oahu, Kaimi Stream in Kailua Val- ley , near 91-92 Kamakalepo Stream in Kailua Valley, near 93-94 Makawao Stream in Kailua Valley, near. 89-90 North Branch of Kahanaiki Stream in Kailua Valley, near 96-97 Pohakea Stream in Kailua Valley, near. 94-95 South Branch of Kahanaiki Stream in Kailua Valley, near 96 Kailua Stream near Huelo, Maui 145-146 Kaimi Stream in Kailua Valley, near Kailua, Oahu 91-92 Kainahola weir near Kealia, Kauai, North Fork of Kaehulua Stream at 58-59 Kaiwiki near Hilo, Hawaii, Honolii River at 167 Kalihi Stream at Kioi Pool, near Honolulu, Oahu 74 Kalihiwai River near Kilauea, Kauai 65-66 Kamakalepo Stream in Kailua Valley, near Kailua, Oahu 93-94 Kanaha ditch near Lihue, Kauai 51-53 Kaneha ditch near Kealia, Kauai 62-63 Kapaa River near Kealia, Kauai 59-60 Kapahi ditch at Kapahi, near Kealia, Kauai. 61-62 . Kapaia near Lihue, Kauai, Hanamaulu River at 45-46 Kauai, list of stations on 22-23 miscellaneous measurements on 73 rainfall stations on 175-176 stream-flow records on 27-73 table showing precipitation on 180-181 Kauai Electric Co. , cooperation of 175 Kauaula ditch near Lahaina, Maui 126-127 Kaukonahua Stream, Left Branch of North Fork, near Wahiawa, Oahu.... 100-101 Right Branch of North Fork, near Wah- iawa, Oahu 99-100 South Fork, near Wahiawa, Oahu 102 Kawaikoi Stream near Waimea, Kauai 28-29 Kealia, Kauai, Akulikuli Spring near 60-61 Anahola ditch at Kiokala, near 64-65 Anahola River above dam at Kiokala, near .-.:.. 63-64 Kaehulua Stream at Kuhinoa weir, near. 57-58 Kaneha ditch near 62-63 Kapaa River near 59-60 Kapahi ditch at Kapahi, near 61-62 Konohiki Stream at Makakualele weir (mauka), near 55-56 North Fork of Keahulua Stream at Kai- nahola weir, near 58-59 South Fork of Kaehulua Stream at Wai- namuamu weir, neat 56-57 Kehena ditch at Honokane Mauka, near North Kohala, Hawaii 173 Kekaha Sugar Co., cooperation of 175 Kennedy, H. M., work of 22 KUauea, Kauai, Kalihiwai River near 65-66 Kimble, Howard, work of 22 Kioi Pool near Honolulu, Oahu, K!alihi Stream at 74 Kiokala, near Kealia, Kauai, Anahola ditch at 64-65 Anahola River above dam at 63-64 Kohala ditch near Kohala, Hawaii 170-172 Kohala group, Hawaii, stream-flow records for 170-172 Konohiki Stream at Makakualele weir (mauka), near Kealia, Kauai 55-56 Koula, Kauai, Hanapepe ditch at 40-41 Hanapepe River at 37-38 Kuhinoa weir near Kealia, Kauai, Kaehulua Stream at 57-58 Kukaiau Ranch Co. , cooperation of 175 Kukuihaele, Hawaii, New Hamakua ditch at main weir near 169-170 Kuna ditch near Hanalei, Kauai 68-69 INDEX. 189 L. Page. Lahaina, Maui, Honokawai ditch near 119-120 Honokawai Stream near 118 Kah-oma ditch, at weir, near 121-122 Kauaula ditch near 126-127 Lahainaluna ditch near 124-125 Lahaiaaluna Stream near 122-124 Launiupoko Stream near 127 Lahaiaaluna ditch near Lahaina, Maui 124-125 Lahainaluna Stream near Lahaina, Maui. . 122-124 Launiupoko Stream near Lahaina, Maui 127 Lihue, Kauai, East Branch of North Fork of Wailua River near 53-55 Hanamaulu ditch near 48-49 Hanamaulu River at Kapaia, near 45-46 Huleia River near 43-44 Kanaha ditch near 51-53 North Fork of Wailua River near 50-51 South Fork of Wailua River above Waiehu Falls near 46-47 Lihue ditch near Lihue, Kauai 49-60 Luakaha weir ia upper Nuuanu Valley, near IIonolulu,Oahu, Nuuanu Stream at 75 Lulumaha ditch at upper Nuuanu reservoir, near Honolulu, Oahu 76-77 M. Makakualele weir (mauka) near Kealia, Kauai, Konohiki Stream at 55-56 Makawao ditch at Makawao flume, near Waimanalo, Oahu 88 Makawao Stream in Kailua Valley, near Kailua, Oahu 89-90 Makaweli, Kauai, Olokele ditch at Tunnel No. 12, near 33-34 Olokele ditch at weir, near 35-36 Makaweli River near Waimea, Kauai 31-32 Makee Sugar Co . , cooperation of 175 Maniania ditch near Wailuku, Maui 105 Manianiaula, near Waikane, Oahu, Waiahole Stream at 97-98 Manoa Stream at College of Hawaii, near Honolulu, Oahu 80-82 at upper Manoa Valley, near Honolulu, Oahu 80 Manoa Stream, East Branch, at upper Manoa Valley, near Honolulu, Oahu 82-83 Manoa Stream, West Branch, at upper Manoa Valley, near Honolulu, Oahu 84-85 Man's water, definition of 16 Maui, list of stations on 24-26 miscellaneous measurements on 151-152 rainfall stations on 177-178 stream-flow records on 104-152 table showing precipitation on 182 Maui Board of Supervisiors, cooperation of. . 175 May, W. S., cooperation of 175 McClellan, J., cooperation of 175 Measurements, stream-flow, methods of ob- taining 9-10 Meyer, F., cooperation of 175 Million gallons, definition of 15 Miner's inch, definition of 15 Miscellaneous measurements on Hawaii 174 on Kauai 73 Miscellaneous measurements on Maul 151-152 on Oahu 103 Multiple-point method, use of 12 N. NaiUUihaele Stream near Huelo, Maui 144-145 New Hamakua ditch at main weir near Ku- kuihaele, Hawaii 169-170 North Branch or Fork. See name of main stream. North Kohala, Hawaii, Kehena ditch at Honokane Mauka, near 173 North Waiehu Stream near Wailuku, Maui. 109-110 Nuuanu reservoir, upper, near Honolulu, Oahu, Lulumaha ditch at 76-77 Nuuanu Stream at Luakaha weir in upper Nuuanu Valley, near Honolulu, Oahu 75 below reservoir No. 2 wasteway, near Honolulu, Oahu 75-76 O. Oahu, list of stations on 23-24 miscellaneous measurements on 103 rainfall stations on 176-177 stream-flow records on 74-103 table showing precipitation on 181 Oanui Stream near Huelo, Maui 146-147 Olokele ditch at Tunnel No. 12, Makaweli, Kauai 33-34 at weir near Makaweli, Kauai 35-36 Olowalu ditch No. 1 near Olowalu, Maul. . 129-130 Olowalu Stream near Olowalu, Maui 128-129 Olowalu Sugar Co. , cooperation of 175 Oopuola Stream near Huelo, Maui 139-140 P. Pacific Sugar Mill, cooperation of 175 Palolo ditch near Waikapu, Maui 132-133 Palolo Valley, upper, near Honolulu, Oahu, Waiomao Stream at 85-86 Pauoa Stream at upper Pauoa Valley, near Honolulu, Oahu 7&-79 Pauoa Valley, upper, near Honolulu, Oahu, Kahuawai Spring at 79 Pioneer Mill Co. , cooperation of 175 Pohakea Stream in Kailua Valley, near Kai- lua, Oahu 94-95 Poowaiomahaihai ditch near Waimea, Kauai. 36-37 Princeville ranch (W. F. Sanborn), coopera- tion of 175 Puohakamoa Stream near Huelo, Maui (old and new stations) 135-137 Puualala, near Waimea, Hawaii, Hamakua ditch at main weir 168 R. Rainfall stations, table showing maximum precipitation 184-185 table showing precipitation and evapo- ration 180-183 Rainfall stations in Hawaii, list of 175-179 Rain gaging, explanation of 174-175 Rating table, use of 17-18 basis of 21 190 INDEX. Run-off, definition of 15 method of obtaining 11-14 S. Sanborn, W. F. , cooperation of 175 Scope of work 9 Second-foot, definition of 15 Second-feet per square mile, definition of 15 Single-point method, use of 12 Soundings, method of obtaining 11 South Branch or Fork. See name of main stream. South Side Waikapu ditch near Waikapu, Maui 131-132 South Waiehu ditch near Wailuku, Maui . . 107-108 South Waiehu Stream near Wailuku, Maui. 106-107 Spreckels ditch near Huelo, Maui 141-144 near Waihee, Maui 112 Stream measurement, accuracy of 21 field methods of 9-10 methods of computing 17-20 T. Tables, explanation of 20-21 Terms, definition of 15-16 V. Valentine, Alex. , cooperation of 175 Velocity-area measurements, methods of mak- ing 11-14 W. Wading station, definition of 14 Wahiawa, Oahu, Left Branch of North Fork of Kaukonahua Stream, near.. 100-101 Wahiawa, Oahu, Right Branch of North Fork of Kaukonahua Stream near 99-100 Wahiawa, Oahu, South Fork of Kaukonahua Stream near 102 Waiahole Stream at Manianiaula, near Wai- kane, Oahu 97-98 Waialae River near Waimea, Kauai 29-30 Waiehu Falls, near Lihue, Kauai, South Fork of Wailua River above 46-47 Waiehu. ditch. South, near Wailuku, Maui. 107-108 Waiehu Stream, North, near Wailuku, Maui 109-110 Waiehu Stream, South, near Wailuku, Maui 106-107 Waihee Stream near Waihee, Maui 110-111 Waihee, Maui, Kahakuloa Stream at KaJia- kuloa, near 113 Spreckels ditch near 112 Waikamoi Stream near Huelo, Maui 138-139 Waikane, Oaiiu, Waiahole Stream at Mani- aniaula, near 97-98 Waikapu, Maui, Palolo ditch near 132-133 South Side Waikapu ditch near 131-132 Waikapu Stream near Waikapu, Maui . . 131 Wailua River, East Branch of North Fork, near Lihue, Kauai 53-55 Wailua River, North Fork, near Lihue, Kauai 60-51 Wailua River, South Fork, above Waiehu ' Falls, near Lihue, Kauai 46-47 Wailuku, Maui, lao Stream near 104-105 Maniania ditch near 105 North Waiehu Stream near 109-110 South Waiehu ditch near 107-108 South Waiehu Stream near 106-107 Wailuku River near Hilo, Hawaii 166-167 Wailuku Sugar Co. , cooperation of 175 Waimanalo, Oahu, Makawao ditch at Maka- wao flume, near 88 Waimanalo ditch below main reservoir on the Waimanalo plantation, near Waimanalo, Oahu 86-88 Waimea, Hawaii, Hamakua ditch at main ■weir, Puualala, near 168 Waimea, Kauai, Halekua Stream near 32-33 Kawaikoi Stream near 28-29 Makaweli River near 31-32 Poowaiomahaihai ditch near 36-37 Waialae River near 29-30 Waimea ditch near Waimea, Kauai 31 Waimea River near Waimea, Kauai 27-28 Walnamuamu weir near Kealia, Kauai, South Fork of Kaehulua Stream at 56-57 Wainiha River (East and West channels) at power house, near Wainiha, Kauai 69-73 Waiomao Stream at upper Palolo Valley, near Honolulu, Oahu 85-86 Water-stage recorder, description of 14 Weir measurements, advantages of 10 West Branch or Fork. See name of main stream. West Maui, list of stations on 24-25 White, G. R.,workof 22 Willard, C. R., cooperation of 175 Wood, B. D., work of 22 o LIBRARY OF CONGRESS 019 953 856 1