| OCR Text |
Show 76,000 acre- feet of water would be attributable to Goshen Bay and 29,000. acre- feet to Provo Bay. Under the proposed plan Provo Bay would be converted to an irrigation development which would require about 22,000 acre- feet of water annually. Thus, the net water available from Provo Bay would approximate 7? 000 acre- feet per year. Alternatives for development under a diking situation are discussed in Section H. Issue l6: The proposed peaking power operation of the Diamond Fork Power System would create a serious safety hazard and cause substantial erosion problems and siltation of Hayes Reservoir. Issue raised by: Forest Service Utah Wildlife and Outdoor Recreation Assn. and three individuals Response: Historical records and comments received on the draft environmental statement verify that a safety hazard and an erosion problem already exist on Diamond Fork. The maximum flows in this stream between the Dyne Power Plant site and the Hayes Reservoir site have exceeded 500 c. f. s. for 17 years of the 30- year period from 19^ 0 through 19& 9* The maximum flow recorded was 1,610 c. f. s. ( May 1952). At present, changes in irrigation releases from Strawberry Reservoir occur almost daily during the irrigation season. For example, in August 1970, there were 29 changes during the month. These changes ranged from a maximum of 35*+ c. f. s to a minimum of 9 c. f. s., with the average change being ^ k c. f. s. Presently the flows are causing the channel to erode, and the erratic fluctuations are hazardous to campers and fishermen. Under Unit operation, the maximum flows in Diamond Fork would be less than at present, but the average maximum flow of U80 c. f. s. would continue to erode the stream channel. The stream variations would increase in frequency and magnitude- being as much as ^ 00 c. f. s. twice per day- thereby increasing the potential safety hazard and aggravating the stream channel erosion problem. Alternatives to reduce or eliminate these fluctuations along with their associated environmental impacts, are discussed in paragraph H* 4b(^)( c) of this statement. These alternatives would include ( l) increasing the capacity of the Wasatch Aqueduct to convey part or all of the Dyne Power Plant directly to Hayes Reservoir that would otherwise be transported via the stream channel: and ( 2) construction of an after bay storage reservoir below Dyne Power Plant to allow discharge of this water to Diamond Fork and thence to Hayes Reservoir at a uniform rate so as to minimize the safety hazard and erosion proble] 669 |
