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~"I DafJJt~ . . Benefi t-Cost Comparison 11lC ratios of evaluated annual economic benefits to annual econo!l1!.",,,,,,,,,,,-_cc_____ c~sts for the 100-year period of analysis are derived in table 6. Table 6. Benefit-cost ratios Primary Total Evaluated annual. economic benefi ts $1,316,000 $2,085,000 Annual economi c cos ts .1,082,000 1,082,000 ~ Benefit-cost ratio 1.22 1.93 // Cos t Allocation ~ Table 7 presents estimat.ed construction costs for the multiple- purpose pI an and various dual-purpose and single-purpose plans, based 011 ,january 1969 prices indexed to October 1970. It is assumed that the alternative single-purpose projects \~ould be located at the site of the nultiple-pu~)ose project. Construction costs arc combined Hi th costs for interest during cons truction at 5.125 percent and present worth -'of (y,I&R costs, based on capitalization of these annual costs at 5.125 percent over a 100-year pexiod, to . give total basic cost estimates for use in the cost allocation procedure. Table 8 allocates the const:ruction; interest during construction; and operation, maintenance, and replacement costs of the plan of develop- ment including the ~lishak National Wildlife Refuge, among the purposes served using the Separable Costs-Remaining Benefits method. Results of the allocation are summarized in table 9. Recreation and Fish and Wildlife Enhancel'lcnt As set forth in Public La\~ .89-72, one-half of the separable costs allocated to fish and Hildlife and recreation and all the annual O~l&R costs associated therewith \wuld be reimbursable by non-Federal interests. TIle remaining separable costs and all of the joint costs allocated to these th'O purposes \10uld be nonreimbursable. TIle reimbursable costs for fish and wildlife and recreation plus the annual operation, maintenance, and replacement costs assigned the tHO pu~)oses are presented in table 10. c 7