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.., '~1' ", ;""uu- Report of the Regional Director . 60. The water to be imported from the Colorado River watershed is to come out of Colorado's apportionment under the Upper Colorado River Basin Compact of October 11, 1948. Under that compact, the State of Colorado is apportioned the consumptive use of 51.75 percent of the water available for use in the Upper Colorado River Basin, after deducting a use of not to exceed 50,000 acre-feet annually in Arizona. Colorado's apportionment of Colorado River Basin water is estimated to be about 3,855,000 acre-feet annually. It is estimated that about 1,590,000 acre-feet will be required for use by existing and authorized projects, leaving 2,265,000 acre-feet annually for use by future projects. Of this amount it is estimated that 440,000 acre-feet should be re- served to meet Colorado's share of depletions caused by main stem reservoirs required for long-time holdover storage to make the water available for use under the Colorado River Compact. About 1,825,000 acre-feet annually would remain for use by potential projects. These figures indicate the availability of about 1,750,000 acre-feet of water annually, after full development of the proposed Initial Development, Gunnison-Arkansas Project, to meet other potential uses of Colorado River water in Colorado. . 61. The 1947 report on the Colorado River (H.D. 419, Eightieth Congress, First Session) shows estimated uses by potential irrigation projects; within the natural Colorado River Basin in Colorado, of 870,000 acre-feet annually. Studies are under way to refine the estimate of potential wi thin-basin uses in Colorado for all purposes including industrial uses. Review of available information shows that the total of all such potential uses will likely be less than the figure of 1,750,000 acre-feet. 62. Present and prospective uses from Fryingpan River would be supplied by the by-pass of water from the collec- tion canals. Storage releases from the Aspen Reservoir would replace water diverted that would otherwise be needed bw present and prospective users along the Roaring Fork and Colorado Rivers. 63. During the 1911-1944 period of study the natural water supply of the project area between Pueblo and the Colorado-Kansas boundary averaged 1,143,000 acre-feet an- nually, including return flows but excluding about 48,000 . R 20