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Show ( c) Environmental Impacts of the Alternative For the Price River diversion, the tunnel from Strawberry Reservoir to White River would require the disposal of excavated material in the canyon near the outlet portal. About 200,000 cubic yards of material would be excavated from this tunnel. An area of about 6 acres would be required to deposit this much material to a depth of 20 feet. About 300 second- feet of increased flows would be added to the White and Price Rivers from the tunnel outlet to the Clark Valley Canal diversion point about 18 miles downstream. Some flooding already occurs on the Price River. The section of river with the greatest flooding problem is from Castle Gate to Helper. This is the same section of river where the diversion for the Clark Valley Canal would be made, about 3 miles upstream from Helper. Clark Valley Canal would be constructed along the base of the mountains north and east of Price. This canal would consist mostly of open sections with several siphons and two short tunnel sections. Irrigation of Clark Valley and supplemental irrigation to existing irrigated areas would provide more areas of cover for upland game birds in this desert setting. For the area affected by the Provo River diversion, the environmental impacts would be the same as those described previously for the alternative entitled, " Partial Construction Based on Nondevelopment of Utah Lake." ( k) Transbasin Diversion to Diamond Fork Many alternative plans for conveying Bonneville Unit water from Strawberry Reservoir to the mouth of Diamond Fork have been investigated. The approximately 2,000- foot differential in elevation from Strawberry Reservoir to the valley floors of the Wasatch Front provides an obvious power potential. The Diamond Fork terrain has a steep natural gradient which is favorable for powerplants, penstocks, afterbays, forebays, etc. Alternative plans for a Diamond Fork delivery system, with and without powerplants, are described below. ( a) Diamond Fork Power System One alternative plan for the Bonneville Unit would eliminate the Diamond Fork Power System and use the 598 |