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<br />Beneficial Consumptive Uses <br /> <br />Upper Basin Uses <br /> <br />The three largest categories of depletion in the <br />Upper Basin are agricultural use within the drain- <br />age basin, diversions for all purposes to adjacent <br />drainage basins, and evaporation losses from all <br />reservoirs. <br /> <br />During water year 1977, agricultural and M&I di- <br />versions in the Upper Basin were estimated at <br />2,300,000 acre-feet. Approximately 540,000 acre- <br />feet of water were diverted to adjacent drainage <br />basins and approximately 590,000 acre-feet evap- <br />orated from main-stem reservoirs in the Upper <br />Basin, It is estimated that an additional 150,000 <br />acre-feet evaporated from other reservoirs and <br />stockponds in the Upper Colorado Basin for a to. <br />tal depletion of 3,580,000 acre-feet. <br /> <br />This compares to the following consumptive uses <br />and losses in the Upper Basin as published in the <br /> <br />"Colorado River System Consumptive Uses and <br />Losses Report" for the 5-year period ending in <br />1975. <br /> <br />Upper Basin Uses and Losses <br /> <br />1971 <br />1972 <br />1973 <br />1974 <br />1975 <br /> <br />1,000 acre-feet <br />_____m____ 3,413 <br />3, 500 <br />3,403 <br />3,819 <br />3, 606 <br /> <br />Water is being stored in the Upper Basin reservoirs <br />and will be released to the Lower Basin as specified <br />by the Colorado River Basin Project Act and the <br />laws, compacts, and treaties upon which the op- <br />erating criteria promulgated pursuant to section <br />602(a) of the act are based. <br /> <br /> <br />Pressure sprinkler system for farm irrigation, Utah. <br /> <br />23 <br />