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<br />o <br /><:) <br />(-' <br />0') <br />,n <br />'-II <br /> <br />The in-basin demands for the present level of irrigation, municipal and industrial use in the <br /> <br /> <br />basin were estimated based on evaluation of the historic diversion records for ditches and <br /> <br /> <br />structures having entitlements of 5.0 cfs and larger. Recorded diversions for the entire 33.year <br /> <br /> <br />study period were first compared with the associated decreed water rights. Major discrepancies <br /> <br /> <br />between the listings were resolved. Where the diversion records were Incomplete, the beginning <br /> <br />years of diversion were assumed on the basis of the decreed dates of appropriation for the rights. <br /> <br />Incomplete diversion records were extended or filled in by comparison with the available portions of <br /> <br />the diversion record and by correlation with other diversions. Finally, to resolve inconsistencies, the <br /> <br /> <br />aggregate of the adjusted diversion records for each basin was compared with the consumptive-use <br /> <br /> <br />estimates prepared by the USSR (USSR, 1963-1982). <br /> <br />Table 3.2 shows the estimated present level of irrigation demands in the Colorado River <br /> <br /> <br />Sasin above Cameo for the major segments of the basin. Also shown on Table 3.2 are the average <br /> <br /> <br />irrigation efficiencies. These efficiencies represent the amounts of crop consumptive use as a <br /> <br />percent of the diversions. The average annual use of water for irrigation in the Colorado River Sasin <br /> <br />, <br />above Cameo has not changed significantly over the 33-year study period. <br /> <br />3.8 <br />