OCR Text |
Show Table 1 Net Demand on Grand Coulee Regulating Reservoir With full development Initial A.F. Annually Development Miscellaneous area Stratford to Soap Lake 28,000 28,000 East High Canal 877,000 0 East Low Canal 1,157,000 1,157,000 West Canal 1,319,000 1,319,000 Potholes Area 1,183,000 1,183,000 Potholes Reservoir Evaporation Losses (1) 69,000 69,000 Seepage Losses, 50 s.f. (2) 36,000 36,000 Long Lake evaporation losses 10,000 10,000 Gross Demand 4,679,000 3,802,000 Long Lake release for lands above Potholes 1,889,000 1,424,000 Less consumptive use at 2 A. F. per acre (3) 815,000 587,000 Return flow, total 1,074,000 837,000 Losses on waters carried for land below Potholes (4) 75,000 54,000 Total unused water 1,149,000 891,000 Less return flow intercepted, (5) 25% 287,000 223,000 Net usable return flow, etc. 862,000 668,000 Net demand on Coulee Regulating Reservoir 3,817,000 3,134,000 Coulee Reservoir evaporation loss (6) 103,000 103,000 Net Demand on Columbia River 3,920,000 3,237,000 (1) Based on annual reservoir evaporation of 4 feet less 1 foot of present loss over reservoir area, on acreage area of 23,000 acres. (2) Estimate by Board. (3) Consumptive use of 2.5 feet less .5 foot of rainfall in dry years. (Lowry-Johnson data in A.S.C.E., papers shows about 2.4 loss while W. W. Johnston assumed 2.5 feet in the report on Problem 4) (4) 5% on releases at Long Lake. (5) Return flow consumed by wet unirrigated areas and for irrigation of non-project pasture lands. (6) Previous estimates indicate loss of 170 second feet by evaporation. Note: No account is taken of seepage, losses from Grand Coulee, Long Lake, or Trail Lake reservoirs as these losses will be recovered for further use. |
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Original book: [State of Arizona, complainant v. State of California, Palo Verde Irrigation District, Coachella Valley County Water District, Metropolitan Water District of Southern California, City of Los Angeles, California, City of San Diego, California, and County of San Diego, California, defendants, United States of America, State of Nevada, State of New Mexico, State of Utah, interveners] : California exhibits. |