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C',J to ~ --- c BUREAU OF RECLAMATION REPORT Project \'forks The project would consist of the Green River Canal, a few short laterals, and a drainage 5,7stem. The Green River Canal would head on the west side of the Green River approxilnately 6 miles east of Big Piney, Wyo. Generally paralleling the river, it would extend 7 miles to the project area and then would run 31.5 miles along the upper edge of the project lands. The canal headworks with a capacity of 175 second-feet would be placed so low in the river that it would not be necessary to raise the water surface by a controlling weir. The headworks structure would be of reinforced concrete with a l2-foot b.r 10-foot radial gate to regulate the flow of water into the canal. The canal would consist mostly of earth section. It would include, however, a short bench flume, a concrete chute and control section, clay-lined sections with a total length of nearly 3~ miles, and 60-inch precast con- crete pipe siphons with a total length of about 1/4 mile to cross North, Middle, and South Piney Creeks. About 6,770 feet downstream from the headworks, a fish screen and wasteway structure would be built to protect fish life. This structure would return a constant flow of 10 second-feet to the river to permit escape of fish and would pass 165 second-feet along the canal for irrigation. The screens, of a revolving type, would be powered by water wheels set in the canal below the screens. A Parshall flume with a 10-foot throat width would be installed immediately below the fish screens to measure the irrig'ltion water. About 13 timber bridges of a standard Bureau design would be built to carry traffic over the canal. About 43 culverts would be built to bypass surface drainage water. Diversions would be made along the canal course through standard reinforced concrete pipe turnouts. Only a few short laterals would be required to reach lands that could not be served by direct turnouts. A simple 5,7stem of drains would be constructed to protect low eleva- tion project and adjacent nonproject lands from damage by seepage. An extensive drainage 5,7stem would not be required because of the favorable soil characteristics and topography. Project Costs Estimated construction costs of the various project features and detailed engineering data on the features are summarized in the table on the following p<3.ge. As shown by the table, the construction costs are estimated at a total of $1,540,000 or $1,476,000 exclusive of non- reimbursable money expended for project investigat ions and surveys from the Colorado River Development Fund. The estimates are based on December 1949 prices and include allowances for engineering, overhead, contingencies, and rights-of-way, 3