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<br />~ <br />N <br />- <br />..., <br />C <br />C <br /> <br />III. ANALYSES <br /> <br />In,general, the same 'procedures were applied in determining <br /> <br />depletions for the 1946-1951 period as described in the report <br /> <br />for the 1914-1945 period. <br /> <br />A. Stream Depletions at Sites of Use <br /> <br />Stream depletions at sites of use for crops and non cropped <br /> <br />areas for the 1946-1951 period were determined by application of <br /> <br />the unit rates of consumptive use of irrigation water listed in <br /> <br />the report for the 1914-1945 period to the 1946-1951 average <br /> <br />acreages of the various crops, cities and towns, and areas <br /> <br />incidental to irrigation. Where necessary, the normal consumptive <br /> <br />use of irrigation water by crops was adjusted to reflect the water <br /> <br />supply available during the 1946-1951 period. <br /> <br />Runoff in the Lower Colorado River Basin was below normal <br /> <br />for the 1946-1951 period and irrigated areas without sufficient <br /> <br />surface storage or sufficient ground-water pumping capacity <br /> <br />experienced shortages of irrigation water. Shortages were ex- <br /> <br />perienced by all irrigated areas except those receiving their <br /> <br />water supply from the main stream of the Colorado River and the <br /> <br />following areas in the Gila River Basin: the Virden Valley in <br /> <br />New Mexico; and Duncan Valley, San Simon Creek, Safford Valley, <br /> <br />Santa Cruz County, Pima County, Pinal County, and Maricopa <br /> <br />County upstream from Gillespie Dam, all in Arizona. The short- <br /> <br />ages were reflected in a lower consumptive use of irrigation <br /> <br />water by crops in the affected areas. The normal consumptive <br /> <br />14 <br />