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12 <br />' ,' Cisco for the years 1960-1978 are 5,914,000 acre-feet per <br />year. The ratio of yield of the long term hydrologic period <br />to the short term hydrologic period is <br />6,)58,400 = 1.143 <br />5,914,000 <br />This means that the long term hydrologic period (1906-1918) <br />was 14.30 wetter than the short term hydrologic period d <br />(1960-1978). <br />(3) Present"Flows. WPRS has not computed present flows at Cisco <br />with their computer modeling though they could perform spe- <br />vial studies to do so. Until such studies are accomplished <br />other techniques must be used to determine present flows. <br />The major project in the basin, the Colorado-Big Thompson <br />Project was put into full operation in the 1950's. Most <br />other irrigation projects were in place by 1960. The his- <br />. <br />torical (recorded) flows at Cisco from 1960-1978 measured <br />4,364,500 acre-feet per year. This should be reasonably <br />close to true present flows for that hydrologic period. The <br />long term (1906-1978 average) yield for present flows would <br />be 14.3% greater than the figure above, based on the obser- <br />vations in part (2). Since predevelopment flows are based <br />on a long term average, present flows should be based on a <br />similar hydrologic period. Present flow at Cisco gage <br />(1906-1978 average) is 1.143 X 4,364,500 = 4,988,600 acre-feet <br />per year. <br />(4) Current Water Dep]etion in main stem Colorado River at Cisco <br />gage = 6,758,400 - 4,988,600 = 1,769,800 acre-feet per year. <br />