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Show Elberta Diversion Dam would replace an existing structure located on Currant Creek about 1% miles downstream from the Mona Dam. Bonneville Unit water from Mona Reservoir would be conveyed to the diversion dam in the existing creek, where it would be diverted into Elberta Canal. The new diversion dam would be a reinforced concrete structure consisting of a 20- foot- long overflow weir, a sluiceway, and a headworks. Protective dikes would extend from the diversion dam to each side of the canyon. Flows through the headworks would be controlled by two cast- iron slide gates and measured by two propeller meters located in a meter structure. Nephi Pumping Plant The Nephi Pumping Plant would lift water from Mona- Nephi Canal into Nephi- Sevier Canal for conveyance to Sevier Bridge Reservoir. The pumping plant would be located about 2 miles south of Nephi on clay, silt, and sand to an unknown depth over alluvial fan gravels. The discharge line would extend southeasterly O. k mile to the Nephi- Sevier Canal. ( Physical data on the plant are given in Table A- 6.) Nephi- Sevier Canal Nephi- Sevier Canal would be an extension of the Mona- Nephi Canal at a higher elevation. It would extend south from the Nephi Pumping Plant to the existing Sevier Bridge Reservoir, crossing Levan Ridge in a 5- foot cut. Water from Sevier Bridge Reservoir would serve the irrigable lands through existing private canals and laterals. Sevier Bridge Reservoir The existing Sevier Bridge Reservoir would receive Bonneville Unit water from the Nephi- Sevier Canal. This would add 29,500 acre- feet of water annually to the reservoir for supplemental irrigation in the Sevier River Basin. This water would be delivered to farmlands downstream from the reservoir via, the Sevier River and existing irrigation canals and laterals and upstream from the reservoir by exchange via existing facilities. The existing reservoir has the capacity to store this additional water without further construction. Features Related to Provo Bay Dike An irrigation development has been proposed for the Provo Bay area about k miles southwest of Provo. Plans include a low Provo Bay Dike along the west side of the area to keep Utah Lake waters out; drains to lower the water table so the 83 |
