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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />o <br />(:-) <br />l;.A.) <br />.- <br />CJl <br />CJl <br /> <br />This is an increase of 5,010 acres over that irrigated prior <br />to the'study period for an increase of 9.5% in the 25 year <br /> <br />period<since 1939. <br /> <br />The irrigated land is about evenly divided between <br />the land receiving a full supply of irrigation water and the <br />land requiring additional water for full crop production. In <br />genera:]., the land located in the tributary strean. basins re- <br />quires 'additional water while the land located along the Colo- <br />rado River has a full irrigation water supply. The annual <br />stream 'depletion of subbasin runoff resulting from irrigation <br />is estimated to be $3,600 acre feet. <br />The population of the subbasin in 1960 was 6,369. <br /> <br />The watler diverted annually from natural stream runoff for <br />municipal, doniestic and industrial use is estimated to not <br /> <br />exceed 3,000 to 3,500 acre feet of which about 2,200 acre <br /> <br />feet are consumptively used vii th the balance returning as <br /> <br />a part of the river flow downstream. <br />The estin;ated present stream depletion of the Rifle- <br /> <br />1/est Divide Subbasin runoff is sun~arized in the following <br /> <br />table: <br /> <br />Present Stream Depletion - Acre Feet <br /> <br />':'A verage annual strean, depletion by <br />irrigation <br />Average annual stream depletion by <br />municipal and industrial use <br />and reservoir evaporation <br /> <br />$3,600 <br /> <br />2.200 <br />$5,$00 <br /> <br />Total annual strean; depletion <br /> <br />*Includes allowance for natural vegetation, seeped <br />land and water surfaces without limitation to man- <br />made depletion. <br /> <br />29 <br /> <br />d <br />