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0850 . INTRODUCTION . In accordaoce with the language of the authorizi.ng legislation for the l'n-ingpan-Arkansas project, the entire cost of the Ruedi Dam and Reservoir is considered as a cost of that project even though the reservoir will have capacity to serve future western slope developments. This treatment of the cost was adopted in the legislation to avoid allo- cations of Fryingpan-Arkansas project costs to "deferred uses." It was brought out in congressional hearings, however, that at such time as western slope uses of' Ruedi Reservoir storage are proposed f'or author- ization, the legislation would provide that the Fryingpan-Arkansas proj- ect be relieved of' an appropriate share of the reimbursable costs of' Ruedi Dam and Reservoir. Thus, the Fryingpan-Arkansas project will serve as an underwriter f'or repayment of' costs of' capacity in Rued! Reservoir in excess of' that required f'or replacement, but will not relieve future Colorado River Basin projects of their customary economic and financial responsibilities. The amount of' water that the Ruedi Reservoir could supply f'or future downstremD developments after meeting replacement needs is estimated in the supplemental report previously mentioned. The average annual reser- voir yield f'or future western slope developments is estimated at 70,000 acre-feet f'or the 1911-57 period and at 62,000 acre-feet for the shorter 1929-48 period. Either of' these yields would be sufficient f'or the entire needs of' both the Basalt and Bluestone projects under plans out- lined in the reports which f'ollow. Part of' the water required f'or these projects me,y be obtained f'rom natural stream f'lows, but the amount is presently unknown. Consequently the amount of' Huedi Reservoir water needed for the projects is likewise unknown. Pending more detailed studies of' the distribution of Ruedi Reservoir water among f'uture west- .~~_~_~()Ile _l2.r.2.~ts the fQ119win!LdistI:i~utiQn_oLr_~s_e~oi:Lc.oS_tl? :W:~____ assumed. . Annual Interest operation Construction during and Pro.1ect cost construction maintenance Basalt $1,885,000 -$96,700 $2,100 Bluestone 990,200 50,800 1,200 Other 425.500 21.tOO 400 Total 3,300.700 169. 00 Y3,700 1/ Includes the $2,300 shown in the table on ;,>age 2 and the increased reservoir operation and maintenance costs required f'or the operation of' the Basalt and Bluestone projects. The Basalt and Bluestone projects appear to represent two f'avorable potentialities for the use of' Ruedi Reservoir water. Both are shown by the following reconnaissance reports to have f'avorable benef'it-cost ratios. Their reimbursable costs could be fully repaid within 50-year repayment periods provided the projects are authorized as participating projects with the Colorado River Storage project. Both projects are worthy of detailed f'easibility studies which will be scheduled as f'unds ~