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10 o i) 2 244 . Plan 3 (West Side Route with Service to East Sidel--This plan proposes to conserve and convey an additional water supply of 1,200,000 acre-feet through storage on Trinity River and enlargement of the California Aqueduct with additional service to east side San Joaquin Valley. For developing the additional supply two storage reservoirs are proposed on the Trinity River. Helena Reser- voir, with a gross storage capacity of 2,800,000 acre-feet, would be built on the main Trinity River downstream from Lewiston Dam. This reservoir would develop an annual new water yield of 600,000 acre- feet which would be diverted to the Sacramento River. Subsequently, Eltapom Reservoir, with a gross storage capacity of 3,100,000 acre- feet, would be constructed on the South Fork of Trinity River. This reservoir also would develop an annual yield of 600,000 acre-feet which would be diverted to Helena Reservoir, with subsequent diversion to Sacramento River. Power generating facilities would be incorporated with these proposed developments. Estimated capital costs of these reservoirs and associated facilities are $540,000,000. Annual OM&R costs would be offset by power revenues with a net annual amount remaining of about $12,300,000. This increased yield of 1,200,000 acre-feet would be conveyed through the California Aqueduct. Incremental capacity would be pro- vided in the aqueduct from ,San Luis Forebay to the terminal Perris Reservoir. Through the San Luis service area (Federal) a parallel canal is contemplated in view of the advanced construction status of the Federal-State system. The State of California estimates the incremental capital cost of facilities for conveying this additional water to southern California at $368,000,000. Savings of approxi- mately $50,000,000 are estimated if the incremental capacity could be incorporated with the Federal-State system through the San Luis area. The estimated total capital cost for this prospective plan, -including storage reservoir systems and incremental conveyance to southern California through the California Aqueduct, is $905,000,000. The net annual OM&R and pumping costs are $16,540,000. . Under this proposal, the additional 1,200,000 acre-feet of water would be stored and conveyed to southern California at an estimated average annual equivalent cost of $48.00 per acre-foot, including interest at 3 percent and amortization of the facilities in 50 years. The average annual acre-foot cost given is computed by using incremental costs of enlargement of part of the California Aqueduct. Appropriate allocation of costs between the California Aqueduct and the proposed incremental enlargement under this plan may reflect some increase in this acre-foot value.