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<br />n.!J2~% <br /> <br />-ll- <br /> <br />in. the Upper Basin of 48,555,~QO acre-feet is required in the Colorado <br />River Storage Project plan, in"luding silt control, for the develop- <br />ment of the Upper Basin and to meet compact obligations. The Bureau'S <br />figures on this 48,555,000 acre-feet capacity is given in its report <br />as follows: <br /> <br />Active <br />Initial <br />Year 200 <br /> <br />Storage <br />37,530,000 <br />25,941,000 <br /> <br />'f <br /> <br />Inactive <br /> <br />Initial <br />Year 200 <br /> <br />StoI'age <br />1l,025,000 <br />2,614,000 <br /> <br />Active storage is required for stream fl~t regulation to meet <br />compact obligations and. the inactive capacity over a 20J..year period <br />will serve for silt control and to maintain the necessary head for <br />the production or hyiI'oelectrie energy, <br /> <br />It is noted that at the end of 200 years, there will remain <br />25,941.,000 acre.-feet of act,ive storage "rhich exceeds by 2,941,000 the <br />estimc::.ted 23,000,000 require i to equate the stream flow and enable the <br />Upper Basin to use its 7,500,000 acre-feet of water, A large active <br />storage, in the initial phase, (estimated at 37,530,000 acre-feet) to <br />maintain estimated hydroelectric po~er returns is required for economic <br />project feasibility. <br /> <br />y <br /> <br />It is considered that thp estimate for silt control, in the very <br />nature of the problem, carried "ith it a considerable degree of specu- <br />lation, Any reduction in capacity for silt control in the order of <br />1,000,000 acre-feet of the total Colorado River storage capacity by <br />reduction in holdover capacity in the Gunnison River Basin would re- <br />duce the estimated useful life of the project for a rela~ively short <br />period of time. Moreover, it ~ay well be assumed that during the next <br />200 years, soil conservation and land treatment pI'ograms in the Upper <br />Basin will have the effect of reducing the silt load. <br /> <br />~ <br /> <br />It also appears that provision could be made to provide another <br />million acre-feet of stora~e i. other presently proposed units of the <br />Colorado River StoraGe Project plan. The Bureau reported to the Committee: <br /> <br />"Rather than establish new reservoirs for this purpose, con- <br />sideration should be Given to increasin~ the height of one or several <br />of the proposed dams included in the Colorado River Storage Froject <br />on other tributaries since these dams or reservoirs are at the most <br />attracti"re sites in the Upper Colorado Rivel. s;ystem"" (See attach"d <br />report of the Bureau of Reclamation of January 2.'~: 1952,) <br />