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28 COLORADO RIVER STORAGE'PROJECT Repayment of cqn8tructioncosts The authorizing act provides specific maximum periods for repay- ment of all reimbursable construction costs, including interest on costs allocated ,to power and municipal water supply, These maxi- mum, repayment periods begin upon completion of each storage unit, participating project, or sepllrable feature thereof. Because of the time lag between completion of the first and last separable features, the allowable maximum period for repayment of the total construction cost of a storage unit or a participating project can be many years longer than the maximum repayment period for each separable feature, With respect'to construction costs, including interest, allocated to power and municipal water supply and the costs of the storage units which are allo~ated to irrigation, the authorizing act requires that repayment be made within 50 years from completion of each separable feature, The :(3ureau's repayment section of the December' 1958 analysis shows that repayment of the total of these costs is anticipated as follows: ' Years from date of completion offiratunlt Allowable re- . 4ntfclpated payment repaUm~t Cost allocated to period period Power___~_~_____u___.~__________.~______________ 70 46 MunIoIpal watersupply__________n______n_hn_ 69 60 Storage unit; costs allocated to jrrigatlonn__.___~-- 56 49 Oosts ollocat~d to irrigation are required to be repaid within 60 years, including, a development period of up to 10 years, except for the Paonia and Eden Projects where the maximum repayment periods, including a development period of up to 10 years, are 78 years and 70 years, respe<!tively/ from the time of completion of each separable feature, The dnalysls shows that repayment is anticipated to be made within the.authorized periods. The analysis indicates that beginning in the year 2012, or 49 years after the first power plant goes into operation, net power revenues from the Storage Project will be in excess of repayment requirements of such revenue~, The analysis shows that by the year 2050 accumu- lated excess netirevenues from power will total $704,226,000, Electric power g~neration , Net revenues :from the sale of electric energy are expected to repay 91 percent of the total reimbursable construction costs of the Storage Project and participating projects, Since over 70 percent of the elec- tric power capaCity and energy is anticipated to be provided by the Glen Oanyon Unit of the Storage Project during the repayment period our comments are directed generally to the power operations of that I!uit, E8timate81 of water supply at Glen Canyon site Since the financial feasibility of the projects is largely dependent on power and power is dependent on water supply, estimates of water supply are extr~mely important, The Bureau's estimates of future water supply avi>ilable at Glen Canyon were based on the assumption that the historical water flows at the Glen Oanyon site for the 32-year' period 1914 through 1945 were representative of long-term water flow conditions of the Oolorado River. These flows, as modified to