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<br />. <br /> <br />001439 <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />~ <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />four categories: (1) irrigation consumptive use; (2) incidental irrigation losses; (3) stock <br />pond evaporation; and (4) livestock use. In this analysis, each of the categories will be <br />discussed separately. <br /> <br />IrriGation ConsumDtive Use <br />Irrigation consumptive use is a function of the crops irrigated. Table 2 summarize <br />the number of acres irrigated by crop in 1981 according to the June 1991 report. The <br />1981 distribution of crops irrigated is generally representative of the 1981-1985 period. <br />1981 is neither the year of largest amount of irrigated area nor the smallest amount of <br />irrigated area. The breakdown for each year, 1981 through 1985, is included in the <br />appendix. <br /> <br />TABLE 2 <br />1981 IRRIGATEO AREA BY CROP <br />COLORADO RIVER BASIN <br />(FROM 1981.1985 USBR <br />CONSUMPTIVE USES AND LOSSES REPORTI <br /> <br /> IRRIGATED AREA PERCENT OF <br />CROP (ACRES I TOTAL <br />AWaW. 314,714 37.6 <br />Alfalfa, Short 89,174 10.7 <br />Corn 61,724 6.2 <br />Orchard w/cover 18.939 2.3 <br />Pasture 163.493 18.3 <br />Pasture, Short 121,907 14.6 <br />Small Vegetables 11,967 1.4 <br />Winter Wheat, Spring 76,223 9.0 <br />TOTAL 837,201 <br /> <br />From Table 2, alfalfa (48.3%1 and pasture grass (32.9%1 acreage comprise 81.2% <br />of the irrigated land in the Colorado River basin. Therefore, accuracy in estimating the <br />consumptive use from these two crop is of the utmost importance. <br /> <br />3 <br />