OCR Text |
Show Dam Type: Homogeneous rolled-earth fill Foundation: Ogallala formation Slope protection: Riprap on gravel blanket on upstream face, seeded topsoil on downstream face Dimensions: Height: 128 feet above streambed, 158 feet above excavation Crest length: 9,200 feet Crest elevation: 3742.0 Volume: 9, 000, 000 cubic yards Slopes: Upstream, 8 to 1 elevation 3635, 3 to 1 to elevation 3710, then 2-1/2 to 1 to elevation 3742 Downstream, 10 to 1 elevation 3632, 4 to 1 to elevation 3670, 2-1/2 to 1 to elevation 3710, and 2 to 1 to elevation 3742 Cutoff trench: 30-foot bottom width with 1-1/2 to 1 side slope. Length 6,200 feet, greatest depth of excavation 43 feet. Spillway and Outlet Type of Spillway: Concrete overflow chute type with stilling basin Spillway crest: Elevation 3710.00 Outlet crest: Elevation 3635.50 Maximum discharge: Spillway, 73,300 cubic feet per second Outlet, 200 cubic feet per second Outlet conduit: 4 feet 8 inches in diameter, 118 feet long Spillway gate: 10 feet 9 inches by 16 feet 6 inches Stilling basin: Reinforced concrete with chute blocks and dentated end sills Concrete: 31,447 cubic yards Reinforcing steel: 3,324,735 pounds. Davis Dam - In 1946 a group of contractors including Utah started Davis Dam and powerhouse to add a fourth multi-purpose structure to the three Hoover, Parker, and Imperial -- regulating the Colorado River. Located 67 miles downstream from Hoover, Davis is an earth and rock-fill embank- ment 200 feet high and 1,600 feet long. Volume content of the dam is 4,357,500 cubic yards. Although the dam is of imposing size, the combined power plant, forebay, and spillway structures requiring 540, 000 cubic yards of concrete are the most spectacular parts of the project, their bulk equalling many a large concrete dam. Davis Dam's reservoir extends upstream to Hoover Dam, it's 67-mile length impounding water for flood control, power production, and municipal water supply. Under the international boundary water agreement with Mexico, it stores water to be released for diversion downstream by Morales Dam into the Alamos Canal to irrigate 800,000 acres of the Mexicali Project. The spillway and forebay areas, built entirely of heavily reinforced concrete, are located at the downstream end of a 4, 500-foot long diversion channel with a maximum depth of 200 feet and a bottom width varying from 50 to 200 feet. |