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<br />(., <br />.301 <br /> <br />I <br /> <br />It was assmmed that regulation by the Wagon Wheel Gap <br />reservoir would result in a depletion which would be a <br />slightly higher percentage of diversion. The average <br />annual allowable diversion between Del Norte and Alamosa, <br />including redivertible return flow, was calculated to be <br />608,000 acre-feet. This amount compares with the 605,300 <br />acre-feet previously mentioned as an ideal diversion <br />requirement. Present irrigators whose water rights are <br />of sufficient seniority to insure them a full water supply <br />without additional regulation have diverted an average <br />of 86,000 acre-feet annually during the 1928-1951 period. <br />This amount was sub~racted from the 608,000 acre-fee~ <br />allowable diversion and the average diversion to be <br />supplied by the project would be 522,000 acre-feet. <br /> <br />Reservoir operation studies were made which routed <br />the flows of the Rio Grande and tributa~ies from Wagon <br />Wheel Gap Reservoir through Caballo reservoir to <br />determine the ability of the Wagon Wheel Gap Reservoir <br />to supply an optimum regulated surface water supply, and <br />control floods in Colorado and New Mexico. Compliance <br />with the Rio Grande Compact was one of the criteria for <br />the studies. <br /> <br />On the basis of an ideally distributed irrigation <br />demand, shortages have occurred historically in most <br />years used in the study period. The operation studies <br />of the report indicate that, with diversions being <br />made in accordance with need, shortages would occur <br />under project conditions in 8 years of the 27 year study <br />period as follows: <br /> <br /> Year Diversion Shortage <br /> Acre-Feet Per cent <br /> 1931 32,300 5.3 <br /> 1934 102,300 16.9 <br /> 1935 16,500 2.7 <br /> 1936 129,700 21.6 <br />I 1940 276,300 45.1 <br />1941 34,300 5.7 <br />1946 16,100 2.6 <br />1951 227,600 36.8 <br />