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C'"j l'- - SAN MIGlrnL PROJECT Plan Descriptions General Scheme - Alternative plans A, B, and C utilize the concept developed in the feasibility plan which was the basis for authorization. Each of these plans include Saltado Dam and Reservoir and the Norwood Tunnel. Alternative plans 1 and 2 each involve the concept of a hydraulic turpine and direct connected pump as used in the base plan developed for the "Salinity Effects Studies" requested by the Office of Management and Budget (OMB). The results of these salinity studies and the so called base plan were presented to the San Miguel Conservancy Board on July 19, 1973. The following descriptions highlight the important variations of each alternative plan. Alternative A - This plan is the Feasibility Plan as authorized. Gravity irrigation by open ditches is used. The water supply for municipal and industrial purposes is used as it appeared in the feasibility study. Revision of irrigation water requirements by the latest technique, the Jensen-Haise method, shows a larger water requirement. This increased water requirement was incorporated into the plan and requires larger project facility sizes than those published in House Document 435. Therefore, in- creased sizes and costs for project facilities are indicated in this arrayal. No change in the amount or delivery location of the municipal and industrial water is made in this plan. Alternative B - This plan is a modification of the Feasibility Plan. The Paradox area is dropped because of the potential for high saline return flows which would originate in this area. Sprinkler irrigation is used in Dry Creek Basin which reduces diversion requirements and return flows. 5,000 acre-feet per year of M&I water would be provided for use on Wright's Mesa and 39,000 acre-feet would be provided for industrial use downstream from Saltado Reservoir. Peaking capacity for irrigation is pro- vided in the Norwood and Dry Creek Basin Canals, therefore, Naturita Reservoir is not required in this plan. Alternative C - This plan includes an 18,000 KW hydroelectric power genera- tion plant. Water for power releases is conveyed from Saltado Reservoir through the Norwood Tunnel and Mailbox Park Canal to a forebay from where it would be released through a penstock to the powerplant in the San Miguel River Canyon. A plant factor of 25 percent was used in sizing the power- plant which means that power is generated for peaking purposes six hours out of every twenty-four hour period. Full and supplemental service irriga- tion is provided to the Norwood-Redvale area only. Municipal, rural and industrial water of 5,000 acre-feet per year would be provided to Wright's Mesa and 39,000 acre-feet per year would be provided for a downstream