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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />0680 <br /> <br />water available is the sum of the available soil moisture <br />plus the actual headgate diversion reduced for irrigation <br />inefficiency and prorated for the number of State-owned <br />shares. Actual consumptive use during the irrigation seasons <br />of comp~ct years 1949-73 averaged 4.452 acre-feet (about 96 <br />percent of the crop irrigation requirement) or about 1.91 <br />acre-feet per acre. Evaporation during the winter is an <br />additional consumptive use; it averaged 263 acre-feet annually. <br /> <br />These computations of historic consumptive use were checked <br />with the USER estimate of irrigation efficiency and the USGS <br />estimate of percent consumption. Average consumptive use was <br />4,715 acre-feet while the headgate diversions corresponding <br />to the State-owned stock was 9,355 acre-feet. The irrigation <br />efficiency was 50.4 percent, less than 54 percent estimated <br />by the USER and much less than 77 percent estimated by the <br />USGS. <br /> <br />-20- <br />