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. . . COST ALLOCATIONS Alte~native Single-purpose Costs The alternative single-purpose ir~'igati:m costs of the Colorado River Storage project were estimated as the costs of providing replacellient stor- age for irrigation and other upstreao water-consuming uses equivalent to that at the Glen Canyon, Fla~ing Gorge, Curecanti, and Navajo units. After allowances are made for sediment deposition to year 2062 and minimum operating levels for power production, the multiple-purpose reser- voirs at Glen Canyon, Flaming Gm'ge, Curecanti, and Navajo units wi,ll ha'fe about 22,443,000 acre-feet of active storaGe cap~city. 'Ele sinGle-purpose alternative must ha'fe an equivalent umocnt of active storage capacity, with- out any specific r<,sel'vation of dead storage "co maintain a m~niraum po;,rer pool, after making allmrances for evap':ll'ation lo,;ses and sediment deposi- tion to year 2062. The lowest cost single-purpose alternative was found to consist of the Cross Mountain, Flaming Gorge, Dewey, and Navajo TIeser- voirs. To assure the initial filling of such al ternati ve reservoirs dur- ing the present ?eriod of incomplete water use in the ColoraJD River Basin, they ,~uld need to be constructed under the same schedule as the author- ized multiple-I'urpose rese~voi!'s. The lowest cost single-purpose re~lacement sto~age alternative was selectei by reconnaissance analyses using available data on the va.'ious large rese~voir sites in the upper basin. The estimated capacities and construction costs of the selected alternative system of reservoirs are shown in the table en the following paGe. Justifiable power expenditure The justifiable expenGiture for power is taken as the cost of the most economica\ single-purpose alternative power development described on page 29. As previously explained, this ~arne coet is twten as a measure of the project power benefit. The total annual costs of the alternative d~velop- ment were estimated en the baais of private financing including taxes and interest at the rate of 6 1/4 peroellt, The estim3'i;eCl costs are summarized below. Itam Cost excluding taxes Taxes Tc":.al Y Computed over a 2 1/2 percent. AveraGe annual equi valent of total cost $31,583,000 8,806,000 40,389,000 100-Year period with Present wortJi}} $1,156, 3eO, 000 322,423,000 1,478,803,000 interest at rate of Justifiable flood control expend1":.ure Flood control benefits, as estimated by the Corps of Engineers, were used as the justifiable flood oontrol expenditure. These have been 39