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A number of subtasks were performed in support of the historic crop consumptive use <br />analysis. Individual technical memoranda describing the approach and results of these <br />subtasks have been included as appendices to this report. In addition, information <br />provided by other RGDSS Contractors was used in the preparation of the historic crop <br />consumptive use estimates, and is referenced herein. <br />1.3 Results <br />Table 1 presents the historic crop consumptive use analyses results, by water district, for <br />the 1950 to 2002 study period. As shown, the irrigation water requirement averages <br />1,118,384 acre-feet per year while water supply-limited consumptive use averages <br />759,045 acre-feet per year. The average annual shortage in the basin is 32 percent. <br />Table 1 <br />Average Annual Consumptive Use Results - 1950 through 2002 <br />Water <br />District Irrigation Water <br />Requirement (acre-feet) Supply-Limited <br />CU (acre-feet) Percent <br />Shortage <br />20 571,238 434,119 24 <br />21 107,603 48,946 55 <br />22 171,859 95,358 45 <br />24 47,917 38,941 19 <br />25 70,258 39,438 44 <br />26 63,156 38,693 39 <br />27 35,988 28,090 22 <br />35 50,365 35,460 30 <br />Total 1,118,384 759,045 32 <br />Figure 1 presents the historic acreage and irrigation water requirement for the study <br />period. Irrigated acreage from 1950 to 2002 averaged 581,129 acres. Average annual <br />irrigation water requirement was 1,118,383 acre-feet. As shown, irrigation water <br />requirement in the basin followed a general increasing trend from 1950 through the mid- <br />1970s that generally follows the increase in irrigated acreage. The pronounced yearly <br />variations in irrigation water requirement are climate driven. <br />cureport_6-2004.doc 2 of 48 June, 2004 <br />