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. . . I.' . l>;..!.....,. ..... Economic and Financial Analyses Separable Costs Separable costs are defined as costs which are traceable to the inclusion of a particular function in a multiple-purpose project. As such, separable costs include both specific costs and separable seg- ments of joint cost features. In the Narrows Unit, the dam and r~servoir, gen~ral propertv, and a portion of che wildlife management area costs assigned to mitigation comprise the joint cost features, Specific costs The unit includes specific costs for both recreation and fish and wildlife enhancement; however, parts of these costs are derived by segregation of the wildlife management area costs among mitigation, national enhancement and local enhancement, and the division of Jackson Lake costs between recreation and local fish and wildlife as indicated in the appended Fish and Wildlife Service report. The distribution of these specific costs, consisting of both capital costs and. annual Ol;\&R expenses, is shown in table 27. Associated interest during construction for the wildlife manage- ment area, Jackson Lake Dam rehabilitation, and the initial recreation lands and facilities is derived in table 28. It is needed both for purposes of project evaluation and cost sharing as provided by the Federal Water Projects Recreation Act (P. L. 89-72). Annual construc- tion expenditures for these developments would be delayed as long as practicable as they could not be used until Narrows Reservoir commenced to store water. As indicated previously, no interest during construc- tion is associated with the development of future recreation facilities as they could be built and placed in 'service within one year. Other separable costs In addition to the specific co'sts for recreation and fish and wildlife, Narrows Dam and Reservoir contains separable segments of joint costs traceable to the inclusion of irrigation, flood control, recreation, local, fish and wildlife enhancement, and road improvement under P. L. 81-874. The measurement of these separable costs is made decrementally, i.e., the costs of a remaining Narrows Unit with particular purposes omitted, each in turn, are deducted from the costs of the unit as planned with the differences, or remainders, identifiable as separable costs. This analysis is shown in table 29. In order to identity the separable costs for recreation and local fish and wildlife enhancement associated with the transfer of Jackson 92