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<br />"e' <br /> <br />-- <br />M <br /> <br />CHAPTER III <br /> <br />WATER SUPPLY <br /> <br />Only in very dry years is it necessary to allow natural flow to reach <br />the Raynard ditch, a small ditch diverting downstream from Grand <br />Tunnel ditch. The acreage that would be supplied replacement water <br />from Rifle Gap Reservoir is 2,450 acres, the area under Rifle Canyon, <br />Grand Tunnel, and Raynard ditches. The remaining ditches, which are <br />small, would receive their water supply from return flow as in the past. <br /> <br />Estimated monthly gross diversion requirements for project lands and <br />lands to receive replacement water are shown in the following table. The <br />total requirements are based on the net irrigable area of the project <br />(6,870 acres) which is the irrigable area corrected for nonproductive lands. <br /> <br /> ESTIMATED MONTHLY GROSS DIVERSION HE( UIREl'1ENTS <br /> Percent Dry Elk Harvey Davie Lower Rifle <br /> of Valley y Mesa ?J ditch lands 4 <br />Month annual (acre-feet)l (acre-feet) :(acre-feet )Y (acre-feet) <br />April 4 160 620 110 440 <br />May 15 620 2,370 430 1,670 <br />June 22 910 3,470 640 2,420 <br />July 22 910 3,470 640 2,420 <br />August 18 740 2,800 510 1,990 <br />September ~ 570 2,170 400 1,550 <br />October 200 760 140 540 <br />Total lOO , 4.110 15.660 2 870 11 0,0 <br /> <br />W' <br /> <br />y Based on annual requirement of 3.3 acre-feet an acre for 1,250 net <br />irrigable acres. <br />?J Based on annual requirement of 3.3 acre-feet an acre for 4,750 net <br />irrigable acres. <br />Y Based on annual requirement of 3,3 acre-feet an acre for 870 net <br />irrigable acres. <br />W Based on annual requirement of 4.5 acre-feet an acre for 2,450 net <br />irrigable acres. <br />Return Flow <br /> <br />About 45 percent of the water diverted would be used consumptively on <br />project lands. Much of the remainder would return to stream channels. <br />Some of the return flow from lands under the Davie ditch could be used by <br />Lower Rifle Creek lands that would receive replacement water and on Harvey <br />Mesa, but the majority could not be reused in the area and would return to <br />the Colorado River. Return flow from Harvey Mesa and Dry Elk Valley also <br />would enter the Colorado-Rivet as the.draina~e~frem.Harvey Mesa-would entor <br />10ea2- channels. below points of diversion .and dDllinag", irom Dry Elk Valley <br />would ~nter West Elk Creek and be lost to project use. <br /> <br />24 <br />