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.. " I I I I ! . I , , , , . I 1 i , , ~ ,~ . a m ~ <...., A fairly permanent pool is desirable also for a reservoir to have recreational benefits. The operation studies indicated that the reservoir under consideration would be empty 77 months out of the 600 month study period, or 13 percent of the time. Furthermore, recreational benefits are not authorized by law as benefits against which nonreimbursable costs can be made. Domestic ;rater for the City of Trinidad could be supplement- ed by storage of water in the Piedmont Bridge Reservoir for use during ~eriods of heavy demand. In addition to firming up the City's supply with the enhanced supply, domestic water could be furnished to the rural areas and towns northeast of Trinidad. Benefits to the project from domestic water storage could be obtained by using storage capacity in the reservoir instead of increasing the capacity of the supply line from North Lake. HO;lever, local interests would have to repay with interest the cost of that part of the stora~e capacity allocated for domestic PUrposes. The difference between tile cost of the project al- located to conservation purposes anj the amount of the cost which tne water users can repay was found to be so great that no at- temyt was made to evaluate the benefit which might accrue to domestic water supply. No firm energy could be generated by releases from the reservoir if a hydroelectric plant were installed as a part of the project. The release of water for irrigat~on use is not compatible with the release of water for the generation of firm energy. He-regulation of the storage below the hydroelectic plant is required to malee the two uses compatible. Studies indicated that this would not be economical. -22-