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<br />. <br /> <br />. <br /> <br />. <br /> <br />001181 <br /> <br />Annual streamflow values were indexed in order of magnitude from 0,5 to 1.2, <br />with 1,0 representing the mean. It was assumed that irrigation efficiency <br />during years with high streamflow, would be less than during years with low <br />streamflow. To account for this, the streamflow values with the lower indexes <br />were weighted. The average growing season length, based on estimates from the <br />Enoineerino Advisory Commission's Reoort, 1948, and the UODer Colorado Reoion <br />ComDrehensive Framework Study. 1971, was adjusted yearly by the streamflow <br />index. As a result, the len9th of the growing season yaries from year to <br />year. <br /> <br />Because the census acreage data did not reflect shortages for irrigated crops, <br />adjustment percentages were applied to the full season alfalfa and pasture <br />acreage figures to obtain short and full supply acreage estimates, The <br />percentages used were based primarily on information in the Enoineerino <br />Advisory Commission's ReDort, 1948, and the UDDer Colorado Reoion <br />ComDrehensiye Framework Studv, 1971, This shortage percentage is constant and <br />does not vary from year to year. The shortage percentages for each sub-basin <br />in the Gunnison River Drainage Area are shown in Table 3. <br /> <br />Incidental ConsumDtive Use <br /> <br />The total depletion attributed to irrigation includes not only the direct use <br />from irrigated crops but also other uses incidental to the irrigated crops, <br />seeped areas, and phreatophytes. These losses, which were estimated in the <br />UDDer Colorado Reoion ComDrehensive Framework Studv. 1971, were assumed to <br />vary directly with irrigated acreage. Incidental use for 1965 was estimated <br />using depletions and acreage figures from ]965. An incidental use was <br />presented as a percentage of the depletions (or crop consumptive use) and <br />based on the total irrigated acreage of the sub-basin. A different rate was <br />calculated for each sub-basin; this rate did not vary from year to year. <br />Incidental use rates for each sub-basin in the Gunnison River Drainage Area <br />are shown in Table 3, <br />