OCR Text |
Show reduce angling success somewhat and produce some disruption of the usual summer aquatic ecosystem. The fishery problems in the river from Olmsted Tailrace to Utah Lake, that result from late sunmer dewatering, would continue to exist after Unit operation comnenced. Diamond Fork Power System Operation of Diamond Fork Power System would affect streamflows in Sixth Water Creek, Diamond Fork, and the Spanish Fork River. Figures C- 13 through C- 15 compare existing average flow patterns to those that would occur under conditions planned for the Bonneville Unit. 1• Sixth Water Creek Diversions from Strawberry Reservoir through the existing Strawberry Tunnel would no longer be made if the proposed Syar Tunnel were put into operation as planned. An estimated 5 c. f. of seepage would continue to flow from the existing tunnel into Sixth Water Creek0 A minimum of 15 c. f. s. or the minimum flow of Sixth Water Creek, whichever is smaller would be released to the stream below Sixth Water Dam. The improved flow pattern would affect about 8 miles of stream. These flows are recommended by the Utah Division of Wildlife Resources, the U. S. Bureau of Sport Fisheries and Wildlife, and the U. S. Forest Service. While the fishery problems of excessive flows would be eliminated, new problems would arise involving the use of an enlarged channel by a reduced flow of water. Tnis aspect has been discussed previously in paragraph C3c( 2) and receives further discussion in Section D. 2. Diamond Fork Under Unit conditions, 197,600 acre- feet of water diverted from Strawberry Reservoir would be conveyed annually to Bonneville Basin through the proposed Syar Tunnel and in succession through Syar, Sixth Water, and Dyne hydroelectric powerplants. Flows through the powerplants would be regulated by Syar, Sixth Water and Hayes Reservoirs. Part of the 337 |