OCR Text |
Show Dam, Reservoir, Aqueduct, and Pumping Plant, and Burns Pumping Plant would be the main features of the Unit. A sketch map of the Unit with these features is shown on Figure C- 20. The dam and reservoir would be located on Big Brush Creek approximately 3 miles downstream from the Utah Highway 44 crossing. Capacity of the reservoir would be 26,000 acre- feet with 24,000 acre- feet of active capacity. Normal water surface of the reservoir would be 521 acres with a minimum pool of 2,000 acre- feet. Source of the water supply developed would be Big and Little Brush Creeks and the Green River. To provide power for Unit features about 20 miles of new transmission lines would be built. The reservoir basin would be in a small valley with steep side slopes. Many intermittent streams in deep arroyos lead into the valley. The area is quite isolated, although small farms are found along the stream from the reservoir area downstream where sufficient arable land has been deposited. The Unit would develop 4,700 acre- feet of water for irrigation purposes, the remaining 18,000 acre- feet would be used for municipal purposes. Plans call for immediate purchase of 7,200 acre- feet of municipal water with additional purchase when needed. The municipal water would be used in the Vernal- Jensen area. The irrigation water would be used on 3,640 acres of supplemental service land and 440 acres of full service ( new) land along Brush Creek and in the vicinity of Jensen. Initially water from the active storage capacity of Tyzack Reservoir would be used primarily for irrigation with lesser amounts being needed for municipal and industrial purposes. As demands for municipal and industrial water increased, greater amounts of storage water would be made available for that use and irrigation demands would be met by pumping from the Green River. Lands that would receive a full supply of water are interspersed among presently cultivated lands so new canal construction would consist of short extensions of existing laterals. These extensions would be of the head ditch type. An estimated 6 miles of drains would be necessary to bring 700 acres to peak production. To transfer the municipal water to Vernal from the Tyzack Reservoir, a 4- mile buried aqueduct would be constructed. 411 |