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Show PROBLEMS OF IMPERIAL VALLEY AND VICINITY. 33 Table No. 4.-Summary of irrigation, entire basin, by political boundaries. United States: Wyoming.............. Colorado..........__ Utah.................. New Mexico......... Arizona......"......... Nevada.....'.......... California:..-........ ' f ¦ ¦ Total, United States. Mexico........:.y,......... Total................ Total: Upper basin.......... Lower basin..,....... Gila Basin.... ^........ Total.......„........ Irrigated, 'Additions 1920.1 ' possible. i From United States census, modified by data from State engineers. .••...: | 'Recently the State engineer.has reported 80,0OQ acres additional possible irrigation in Nevada, of which 50,000 acres are in the upper basin. Table No. 5.-Estimated additional acreage which wiU be irrigated in near-future excep't Gila. DRAFT ON WALTER SUPPLY. The discharge of the Colorado at Yuma has been reliably recorded since and including 1903. Before that the meager records are faulty and can not be used. However, a 'period of Tow run-off preceded 1903, and it has been necessary td estimate back to 1899 to include the l6w period. Estimates have been made by various authorities and those of John T. Whistler are used here. What is really wanted is the discharge at Boulder.Canyon, and from the record at Yuma this can be determined approximately by the following steps: (a) The discharge oi the Gila, which enters the Colorado just above . the gaging station at Yuma, must be subtracted* (&) The diversion for Yuma project, which is made at Laguna Dam, also above the gaging station, must be added. {cf The water consumed by irrigation of the 39,000 acres irrigated below Boulder Canyon must pe added. (d) The loss by evaporation from the river bed and from the 200,000 acres below Boulder Canyon, which is perennially submerged, must be added. • Items (a) and (6) are recorded and the adjustment can be made. Item (c) is very small on the average, since this acreage has not Acreage i. . , p^nt CtossA: Class X. Total, ^projects. Upper basin. Lower basin.. Total... |
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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] : |