Bulletin 1.pdf - California Department of Water Resources - State of ...

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WATER RESOURCES OF CALIFORNIA 497 RUNOFF Estimated mean seasonal natural runoff of the Lahontan Area for the 53-year period from 1894-95 to 1946-47 is 3,177,000 acre-feet, or 4.5 percent of total surface runoff of the State. Minimum seasonal runoff amounting to 930,000 acre-feet occurred in 1923-24, and the maximum, totalling 7,070,000 acre-feet, in 1906-07. Water supply during each year of the 10-year period from 1923-24 to 1932-33, except 1926-27, was less than the 53-year seasonal mean, and the average was only 63 percent of this long-time mean. Snow falls on large portions of the tributary drainage of the Lahontan Area. Consequently, a substantial portion of seasonal runoff is delayed until late spring and early summer. For Truckee River, a typical Lahontan Area stream that flows from the Sierra Nevada, snow melt contributes 95 percent of seasonal runoff. Minimum runoff in the Area occurs from August to October, inclusive. On Truckee River runoff during these months is only 4.9 percent of the seasonal total. Stream gaging stations in the Lahontan Area, are listed in Table 71 together with the average, maximum and minimum seasonal runoff for stations with more than 10 years of record. Longest available records of stream flow are for Truckee River at or near the state line, and for Owens River near Round Valley. The record for the 'rruckee has been maintained since September, 1899, and that for Owens River since August, 1903, except from October, 1923, to March, 1927. Records for these two stations are no longer published by the Geological Survey, but may be secured from the Federal Court Watermaster for Truckee River and from the Department of Water and Power of the City of Los Angeles for Owens River. Estimated mean seasonal natural runoff of the 53 years from 1894-95 to 1946-47, shown in Table 72, has been prepared i:r{ the same manner as corresponding tables in preceding chapters. For stations with partial records, mean seasonal runoff shown is the mean of estimated natural flow for each season of the 53-year period. At locations where records are not available, only directly derived long-time mean estimates are given. Estimates of seasonal natural runoff of main stream and tributary basins having records, presented in Table 73, were made in accordance with principles outlined in Chapter III. Estimates of runoff from drainage basins where records were not available were made by comparison with runoff from other basins. In deriving the 53-year seasonal mean for unmeasured streams discharging into lakes in the northern portion of the Area, inflow to a lake, computed from records of lake levels, was taken to be runoff of the stream during the period of record. A relationship was then established with an adjacent stream, and the missing record was estimated by the third method of restoring missing records described in Chapter III. Estimates of mean seasonal runoff for streams or basins for which no records of any type existed were made by comparison with runoff of adjacent areas, on the basis of geographical, geological and meteorological conditions. The portion of mean seasonal runoff that was estimated for the Lahontan Area approximates 1,183,000 acre-feet, the remaining 1,994,000 acre-feet being based on records. An unusual feature of the natural flow estimate for Truckee River, in Table 73, is the occurrence in several years of negative values in esti-
498 WATER RESOURCES OF CALIFORNIA mated flow above the outlet of Lake Tahoe. This is due to evaporation from the lake, estimated to approximate 375,000 acre-feet seasonally. In years for which negative values of flow are shown, estimated evaporation exceeded inflow by the amounts given in the table. An indication of variation in monthly flow in streams in the Lahontan Area draining from the Sierra Nevada is given by data for Truckee River at the state line, presented in the following tabulation: AVEIlAGI MONnaT DlSRlaunoN Of AVEIlAGI SIA50NAL RUNOFF, TRUCKlE RIVER IUWIEN LAKE TAHOI AND FARAD (Drainage Area-425 Squar. Miles) October_•.. 00. __ November.. _ December_" _ laouary__ • . __ February... _ March. __ . _ . ---- ::1 -------1 Pereelltof llea80naJ average Acre-f""t 1.8 7,000 2.5 10.000 3.2 13,000 4.2 17,000 4.8 19.000 9.8 311,000 April.. May June __ • _ _ _ 21.4 26.8 17.0 85,000 106.000 67,000 5.4 21,000 1.7 7,000 1.4 6.000 E::;,;;·.· ••·•• •··•···•·.•• •· .••.··•·· •• ·•· ••• ··I------;------ Totals __ . _ _ . _. 100.0 397,000
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CHAPTER I. INTRODUCTION WATER A MAJ
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CHAPTER II. SUMMARY The purpose of
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REDWOOD mGHWAY-KORTH COASTAL .ARE.\
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COABTAL TERP.AOf-CEXTRAI.. COASTAL
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Table TABLE OF CONTENTS Page 1. Alp
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APPENDIX D GROUND-WATER STORAGE CAP
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APPENDIX E COLORADO RIVER Diversion
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