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.,', '" . estimated first cost to the1ederal Government for construction of $25,59.4,000; and channel illlproveme'nts on the Sand Creek chan- nel, .at an estimated first 'cost to the Federal Gove1'lUll.entof $18,444,000. Of. this amount, an estilllB.ted $1,126,000 and $1,591,050, representing. a 50-percent share of the separable'. costs allocated to the recreation enhancelllent functions and the itellls, not eligible for.cost sharing in the Che1'l'yCreek and Sand Creek basins,.. respecti vely., . would be repaid With interest wi thin 50 years, or would be contributed in cash orin kind during construction of the.projects. An estimated $770,000 of the costs rep~able by non-Federal interests for separable recreation costs in the Che1'l'y Creek basin would be expended by non-Federal interests for purchase of water to provide the initial filling of the recreation pool at the Castlewood reservoir. This purchase would represent a contribu- tion .in kind toward the non-Federal rep~ent obligation, leaving an estimated $356,000 as the net sum 'of repaylllent. The report recommends that the flood control improvelllents be operated and maintained by the United States. In lieu of local cooperation provided by Section 3 of the 1936 Flood Control Act, local interests would be required to pay to the United States an annual sum, or its present worth equivalent, for that portion of the channel improvelllents which is apportioned to flood protection as distinguished from reservoir operation. . The annual sum, which would reimburse the United States for the cost of lands necessary for the additional channel capacity and for a proportional share of the annual cost of operation, maintenance, and replacelllent, is currently estilllated at $208,800. The report recommends that, following authorization of the projects, detailed site investigations and designs be made to define accurately the lands required, and that advance acquisi- tion be made of title to such lands as may be required to pre- serve the site against incompatible developments. The report also recommends that the Chief of Engineers be authorized to participate in the construction or reconstruction oftransporta- t10n and utility facilities in advance of the proposed projects' construction as required to. preserve such areas from encroach- ments and avoid increased costs for relocation. 4 .