would discharge 1,500 second-feet with the water surface at elevation 4,756 feet. An outlet with a capacity of 800 second-feet would be installed in one of the dikes (dike 2A) to deliver water to the potential Kannah Creek Irrigation Canal. Power features Whitewater powerplant would be located at the toe of the dam and would consist of 3 equal-sized units with a total installed capacity of 48,000 kilowatts. The plant would operate under a maximum head of 240 feet and a mean head of about 220 feet. The initial energy generation of the plant with all project units in coordinated operation would amount to 249 million kilowatt-hours annually. With ultimate stream flow depletions, approximately 187 million kilowatt-hours could be produced annually. The power penstocks would be placed in the outlet tunnel. Tailwater elevation at the powerplant would be about 4,640 feet. Transmission facilities would be provided as necessary to distribute the electric energy produced to various load centers and points of interconnection. Access The dam site is readily accessible since it is located only 1 mile from United States Highway No. 50 and is situated directly on a branch line of the Denver & Rio Grande Western Railroad. At the present time both abutments can be reached by dirt roads. Rights-of-way and relocation A small part of the reservoir area consists of improved farmlands. It contains no centers of population. About 28 miles of the Denver & Rio Grande Western Railroad would require relocation. Other facilities requiring relocation within the reservoir area are United States Highway No. 50, some secondary roads, a Mountain States. Telephone & Telegraph Co. line, and a Western Union telegraph line. Geology At the dam site the Gunnison River has cut through Mancos shale and Dakota sandstone and has exposed the upper part of the Morrison formation. This Morrison formation would form the foundation for the dam. It is generally soft and easily weathered. The Dakota sandstone, which would form the abutments for the dam, is predominantly hard and resistant. Six holes, drilled to investigate the foundation, showed the maximum depth of overburden to be 68.5 feet. Percolation tests showed no abnormal seepage losses. The three dikes. would have adequate foundation support and tight abutments. Four borrow areas have been explored as possible sources of construction materials. Tests made on the samples taken show the materials to be ample and acceptable for the fill. Concrete aggregate and riprap are also available. Cost estimates Estimated costs of the Whitewater unit, based on December 1949 prices, are summarized in the following table: Information on the units included in the storage project is summarized in the following table. Total construction costs and total annual costs, including operation, maintenance, and replacement costs, of the various project units are summarized in the following table. Estimated construction costs of the individual project features and detailed engineering data on the features are given on the following pages. The estimates given are based on December 1949 prices. 1 Does not include nonreimbursable money expended from Colorado River development fund for investigations and surveys nor costs of features in the programs recommended by cooperating agencies. Total.. 11, 139, 100, 000 9, 732, 100 |