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<br />FRY~GPAN~AR~SAS PROJECT
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<br />eastern slope canals is planned to facilitate filling the reservoirs. The
<br />western slope collection system would be expanded gradually from
<br />the transmountain tunneL All hydroplants except Pueblo have been
<br />scheduled for simultaneous completion so their operation can be
<br />integrated as a unit.
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<br />WATER SUPPLY
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<br />59. The first phase of the Gunnison-Arkansas project (Roaring
<br />Fork diversion) contemplates the average annual consumptive use
<br />of water from the Colorado River Basin as follows (measured at points
<br />of diversion):
<br />
<br />:y,
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<br />Explanation
<br />Diversion from project collection system of project water_____________
<br />Diversion for fish-preservation purposes_ __ __ _ _ _ __ _ h _ _ _ _ _ _ _ _ _ h _ ___
<br />Losses from Aspen Reservoir and consumptive losses in collection con-
<br />duit_ - - - _ - _ - _ - _ - _ _ h_ - h _ _ _ _ _ _ _ _ _ _ __ n _ _ _ _ _ _ _ _ n __ h _ __ _ _ _ _ _ _ 3, 000
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<br />Total____________________________________________________ 75,200
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<br />"60. The watllr to be imported from the Colorado'River watershed
<br />is to come out of Colorado's apportionment under the upper Colorado
<br />River Basin compact of October 11, 1948. Under that compact, the
<br />State of Coloratio is apportioned the consumptive use of 51.75 percent
<br />of the water available for use in the upper Colorado Ri ver Basin,
<br />after deducting a use of not to exceed 50,000 acre-feet annually in
<br />Arizona. Colorado's apportionment of Colorado River Basin water is
<br />estimated to be about 3,855,000 acre-feet annually. It is estimated
<br />that about 1,590,000 acre-feet will be required for use by existing and
<br />authorized projects, leaving 2,265,000 acre-feet annually for use by
<br />future projects.' Of this amount it is estimated that 440,000acl'e-feet
<br />should be reserred to meet Colorado's share of depletions caused by
<br />main stem reservoirs required for long-time holdover storage to make
<br />the water available for use under the Colorado River compact, About
<br />1,825,000 acre-feet annually would remain for use by potential proj-
<br />ects, These figures indicate the availability of about 1,750,000 acre-
<br />feet of water annually, after full development of the proposed initial
<br />development, Gunnison-Arkansa,s project, to meet other potential uses
<br />of Colorado River water in Colorado.
<br />61. The 1947 report on the Colorado River (R. Doc. 419, 80th
<br />Cong" 1st sess.) shows estimat,ed uses by potential irrigation projects,
<br />withm the natural Colorado River Basin in Colorado, of 870,000 acre-
<br />feet annually. S:tudies are under way to refine the estimate of poten-
<br />tial within-basin .uses in Colorado for all purposes including industrial
<br />uses, Review of available information shows that the to~al of all such
<br />potential uses will likely be less than the figure of 1,750,000 acre-feet.
<br />62. Present an,d prospective uses from Fryingpan River would be
<br />supplied by the 1;\ypass of water ,from the collection canals. Storage
<br />releases from the. Aspen ReserVOIr would replace water diverted that
<br />would otherwise be needed by present and prospective users along
<br />the Roaring Fork and Colorado Rivers.
<br />63. During the 1911-44 period of study the natural water supply
<br />of the project area: between Pueblo and the Colorado-Kansas boundary
<br />averaged 1,143,000 acre-feet annually, including return flows but
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<br />Acre-feet
<br />69,200
<br />3,000
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