OCR Text |
Show -5- gaging stations in the upper basin where the difficulties of measurement are far less, for the entire period of concurrent records. The results of the present study and the estimates by E. C. LaRue appearing in Water Supply Paper No. 556 compare as follows: Mean annual discharge at Black Canyon in acre-feet 1897-1901, inclusive: Bureau's 1930 estimate....................................16,200,000 LaRue 1925 estimate........................................17,700,000 1902-1922, inclusive: Bureau's 1930 estimate from upstream records ..............................................................17,600,000 Bureau's 1930 estimated from Yuma records ..............................................................17,300,000 LaRue 1925 estimate............................................17,800,000 From this study it was concluded that the use of Yuma reported discharges as the basis of estimated flows at Boulder Canyon Dam is conservative. Nevertheless it is believed advisable to assume that Boulder Canyon water supply may be overrated and a general allowance for this purpose is hereinafter explained. Boulder Canyon flow in relation to operated stations. The limited records of stream flow on Colorado River make it advisable to use such records to the full extent available, consistent with confidence in the result. For the years 1897-1901, discharge estimates are based on upstream records, no measurements having been made downstream. For 1902-1922 the Yuma records have been used by deducting Gila River discharges and adding Yuma project diversions to obtain Colorado River flow; then applying a correction based on concurrent records of 1926 to 1929, inclusive, at Yuma and Topock, to obtain Topock |
Source |
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. |