| OCR Text |
Show Utah Power & Light Company 138- kv lines just below the dam axis, a distance of about 3.2 miles. Alternative of Tailwater Regulation A third alternative for reducing the surges in Diamond Fork Creek involves constructing a tail- water reservoir below the Dyne Powerplant, ( Fig. H- 20). An active capacity of 865 acre- feet would be required in the reservoir to reduce the maximum variation of flow of water from the power system to the creek to 25 percent in the maximum month ( June). Three different sites for the tailwater reservoir were investigated. The first would be located on Sixth Water Creek while the other two would be on Diamond Fork Creek. Data pertaining to these sites is given in Table H- ll. The environmental impact of this alternative would be substantial. Earthfill required for the dam embankment would be excavated from borrow areas located downstream on Diamond Fork adjacent to the well- traveled Forest Service road, where they could not be hidden from the view of motorists. The sections of road that require relocation would be constructed on or near the base of vertical rock ledges and would cause large construction scars. The reservoir at the different sites would inundate from 0.8 to 1.1 miles of trout stream. It would fill rapidly and empty once a week and thus could not be safely used for recreation. The drawdown would take place during the weekend when the power- plant was not operating, making the reservoir least attractive during the period of highest recreational activity. 604 |
