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<br />COLO&ADO RIVER STORAGE PRO~ECT <br /> <br />25 <br /> <br />the costs of facilities serving 1D0re than one purpose are .Uocated to <br />,the various purposes i~ a manner that permits each purpose to share <br />in the economy of the ;multiple-purpose development. <br />In the allocaLion prqcedure all benefits and costs including interest <br />dUl'ing construction were converted to present valucs at the beginning <br />of the lOO-year period of analysis at an interest rate of 2)1, percent. <br />The total allocatIOns niade on this basis were then converted to appro- <br />priate caJ?ital and, anr\ual amounts. The amount of interest during <br />constructIOn was then :converted to reflect a 2%-percent rate to deter- <br />mine the amount of interest dUl'ing construction to be reimbursed, <br /> <br />Sepamble and joint costs <br />The separable costs for eitch purpose of the multiple-purpose <br />l,"oject lI.I:e defined It.. the difference hetween the co..t of the mult\ple- <br />purpose project and the cost of the project with the purpose omitted. <br />Thus the separable costs for each purpose include the costs of U,ose <br />project facilit,ies used i solely by that purpose plus the difference in <br />costs of thc joint use fadlities that wonld change in size or desi!,:n with <br />the pm'pose omitted, iSeparable costs were determined by assuming <br />each purpose in turn as'the last pmpose added to the multiple-pm'pose <br />project. The remainitig joint costs are the total project costs less the <br />sum of the separable cPsts for the various purposes, The estimated <br />separable costs of power, irrigittion, flood control, and recreation for <br />the four units of the storage project and the remaining joint costs for <br />the project are shown in the following table. <br />