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<br />. <br /> <br />. <br /> <br />. <br /> <br />O(;333Q <br /> <br />CHAP~R III <br /> <br />POTENTIAL IRRIGATION DEVELOFMENT <br /> <br />May(16 to 31) <br />June <br />July <br />August <br />September <br />Total <br /> <br />Net diversion requirement <br />at Perry Draw Reservoir <br />Acre-feet <br />per acre <br />0.15 <br />.71 <br />.68 <br />.65 <br />.40 <br />2.59 <br /> <br />o/~ <br /> <br />Acre-feet <br />500 ,-.<' <br />2,600 l't.a <br />2,500 ";.~' <br />2,300 1 '::: <br />1,400 Ii. I <br />9,300 <br />I 'J." <br /> <br />Operation Studies <br /> <br />A study was prepared showing the operation of Perry Draw Inlet Canal <br />and Reservoir, simulating project conditions during the 25-year period <br />1928 through 1952. It was found that, in order to limit irrigation short- <br />ages to tolerable amounts averaging about 5 percent of the ideal requirement, <br />the most economical combination of capacities would be 40-second-feet for <br />the inlet canal and 5,300 acre-feet (active) for the reservoir. <br /> <br />Based on average annual flows, the operation study shows that 44,570 <br />acre-feet would be available at the points of diversion after senior water <br />rights were satisfied. Of this amount 4,010 acre-feet would be spilled <br />at the diversion sites during the winter months when the canal would not <br />be operative, 29,350 acre-feet would be spilled because of limited canal <br />capacity, and 1,220 acre-feet would be spilled at diversion sites because <br />of limited reservoir capacity. About 9,990 acre-feet would be diverted <br />into the canal. Of this amount 990 acre-feet would be lost during convey- <br />ance to the reservoir and 270 acre-feet would be lost from increased <br />consumptive use from the reservoir basin. After allowing for a difference <br />of 3,300 acre-feet in storage carryover at the beginning and end of the <br />25-year reservoir operation study period, an average of 8,860 acre-feet <br />would be available for release from the reservoir to satisfy requirements <br />totaling 9,300 acre-feet. The resulting shortages average 4.7 percent <br />of ideal requirements. <br /> <br />An annual S1lllllll&ry of the monthly operation study is shown on the <br />following page. " <br /> <br />Increase in Water Supply Attributable to Project <br /> <br />Since all the lands included in the adopted plan-are new lands, the <br />entire water supply, 8,860 acre-feet or 2.47 acre-feet per acre measured <br />at the reservoir outlet, would be attributable to the project. <br /> <br />Stream Depletion <br /> <br />In computing new stream depletion chargeable to the project, allow- <br />ances were made for consumptive use of irri~ation water along return <br /> <br />26 <br />