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<br />Beneficial Consumptive Use <br /> <br />UPPER BASIN USES <br />The three largest categories of depletion in <br />the Upper Basin ore agriculturol use within the <br />drainage basin, diversions for 011 purposes to <br />adjacent drainage basins, and evaporation <br />losses from all reservoirs. <br />During water year 1973, ogriculture ond M&I <br />uses in the Upper Basin are estimoted to hove been <br />more than 2,200,000 acre-feet due to above nor- <br />mal runoff obove points of diversion in the San <br />Juan and parts of the mainstem Colorado River_ <br />drainage areas. About 690,000 acre-feet were <br />diverted to adjacent drainage basins and 550,000 <br />acre-feet were evaporated from mai nstem reservoi rs <br />in the Upper Basin. An additional 150,000 acre- <br />feet are estimated as ev'aporation from other reser- <br />vciirs and stock ponds in the Upper Colorado Basin. <br />Water is being stored in the Upper Basin reser- <br />voirs and will be released to the lower Basin as <br />specified by Section 602(0) of Public law 90-537 <br />and the laws, compacts, and treaties upon which <br />Section 602(a) is based. <br /> <br />LOWER BASIN USES AND LOSSES <br /> <br />Releases of 6,651,000 acre-feet from lake <br />Havasu duri ng water year \973 were made to <br />meet the requirements for water deliveries at Im- <br />perial Dam as well as those of the Colorado River <br />Indian Reservation near parker, Arizona, the Palo <br />Verde Irrigation District near Blythe, California, <br />other miscellaneous users along the river, and <br />transit losses between Parker Dam and Imperial <br />.~ <br /> <br />Dam. Deliveries to Mexico were made up of river <br />water del ivered to Imperial Dam and waste and <br />drainage return flows from water users below Imper- <br />ial Dam. The small regulatory waste of 30,688 <br />acre-feet was the result of winter stonns, which <br />were prevalent over the lower Colorado Basin. <br />The major water use above Parker Dam was <br />that by Metropolitan Water District of Southern <br />California. Metropolitan Water District pumped <br />1,128,000 ocre-feet from lake Havasu duringwa- <br />ter year 1973. Releases of 7,946,000 acre-feet <br />were made from lake Mohave during water year <br />1973 to meet the requirements for releases at Par- <br />ker Dam, diversions to Metropolitan Water Dist- <br />rict, diversions to contractors for small uses, <br />diversions to other miscellaneous users, along with <br />quantities to offset evaporation and other transit <br />losses between Davis and Parker Dams and to main- <br />tain the programmed levels of lake Havasu. <br />Releases of 7,937,000 acre-feet were made <br />from lake Mead at Hoover Dam during water year <br />1973 to regulate the levels of lake Mohave and to <br />provide for the small uses and the losses from that <br />reservoir. In addition there were 77,000 acre-feet <br />diverted from lake Mead for use by lake Mead <br />National Recreation Area, Boulder City, Basic <br />Management, Inc., and contractors of the Colora- <br />do River Commission of Nevado. The total releas- <br />es and diversions from Lake Mead during water <br />year 1973 were 8, 014, 000 acre-feet. <br /> <br /> <br />wa..teJt 60ft P.<.n.to <br />21 <br />