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Show ( c) Alternatives That Would Reduce or Eliminate Powerplant Surges in Diamond Fork The peaking power operation of Dyne Powerplant would cause twice- a- day surges in Diamond Fork below the powerplant. These surges would aggravate the erosion problem in the stream channel and would be a hazard to fishermen and recreationists in the area. Alternatives have been studied to reduce or eliminate this undesirable condition. i* Alternative of Increasing the Capacity of the Wasatch Aqueduct This alternative would double the capacity of the Wasatch Aqueduct from the Dyne Powerplant to Hayes Reservoir from 200 to U00 c. f. s. This plan would still result in a 200 c. f. s. surge in the creek when the plant is operating at full capacity. To increase the capacity of the aqueduct to U00 c. f. s. would require a 78- inch pipe in lieu of the 66- inch pipe in the proposed plan. The estimated additional cost of this alternative would be $ 5,300,000. By increasing the pipe size to 90 inches, the aqueduct capacity could be increased to 600 c. f. s., and the power water surges could be eliminated. The additional cost in this case would be about $ 7,200,000. Both of these alternatives would relieve the undesirable condition anticipated as a result of the proposed plan to varying degrees. The possibility of using the additional water as it was released from the aqueduct to Hayes Reservoir for power production was also investigated. It was determined that profits would be marginal under the plan which provides for a capacity of U00 c. f. s. However, the increased water of the plan which provides for a capacity of 600 c. f. s. may make a powerplant at Hayes economically feasible if the $ 7,200,000 cost of the aqueduct were a prerequisite. The Wasatch Aqueduct under the proposed plan or either alternative would be located under or adjacent to the Forest Service road in Diamond Fork Canyon to avoid construction scars. If a powerplant were constructed, it would be located on the shore of Hayes Reservoir where it would be partially hidden from the road. The most prominent visible feature involved in these plants would run from the powerplant to the 603 |