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<br /> <br />" <br /> <br />.' <br /> <br />l067 <br /> <br />Reservoir storage capacity would amount to 140,700 acre-feet, allo- <br /> <br /> <br />cated as follows: flood control,h6, 700 acre-feet; conservation, <br /> <br /> <br />55,000 acre-feet; and sediment, 39,000 acre-feet. The storage capacity <br /> <br /> <br />was determined by the oombined requirements for control of the standard <br /> <br /> <br />project flood, regulation of the irrigation water supply, and sediment <br /> <br /> <br />accumulation for 75 years. ~ hO-foot notch on the centerline of the <br /> <br /> <br />spillway would provide automatic flood control release. Balanced free <br /> <br /> <br />discharge valves for the outlet works would control discharges within the <br /> <br /> <br />fine tolerances required for irrigation releases. Existing irrigation <br /> <br /> <br />facilities are considered adequate and would be utilized, without re- <br /> <br /> <br />location or rehabilitation, for the diversion of water to project lands. <br /> <br /> <br />Accomplishments <br /> <br /> <br />Agriculture. Conservation and regulation of the waters of the <br /> <br /> <br />Purgatoire River under the proposed plan of reservoir operation would <br /> <br /> <br />provide a well-regulated water supply for the 19,500 acres of irrigated <br /> <br /> <br />land in the project area. The suppJ;y- could be made available for irri- <br /> <br /> <br />gation use as needed for crop produc:t:ion. The effective irrigation <br /> <br /> <br />water supply would be improved from the present average of 63 percent of <br /> <br /> <br />ideal requirements to an average of 8L~ percent. In the 25-year period of <br /> <br /> <br />study, shortages would be greatly reduced in 11 years and would be en- <br /> <br /> <br />tirely eJ..iminated in the remaining lh years. In contrast, serious irri- <br /> <br /> <br />gation shortages will occur annually mder existing conditions. <br /> <br /> <br />Analysis b.f the Bureau of Reclamation of all factors pertaining to <br /> <br /> <br />the cost of operation and to the productivity of the irrigated farms in <br /> <br />h' <br />