OCR Text |
Show seepage past the diversion dam. Average October to March winter flows at the aqueduct, based on area- altitude runoff studies, are expected to be in the 1.6- to 3.2- c. f. s. range. Seepage and tributary inflows are expected to result in a flow of about 1 to 2 c. f. s. downstream at the gage under Unit operation. The total annual diversion from Water Hollow Creek has been estimated to be 2,900 acre- feet. An estimated average of 300 acre- feet would be spilled during the high runoff period. Water Hollow Creek has been rated as a Class IV fishery by the Utah Division of Wildlife Resources. No recommended minimum flow was submitted. Under Unit operation the existing use of the lower reach of the stream as a spawning and rearing area for Currant Creek fish would be curtailed. Colorado cutthroat trout, reported to inhabit the upper portion of Water Hollow Creek, -^ would not be affected by the diversion. ( j) Strawberry River Soldier Creek Dam, constructed on Strawberry River about 7 miles downstream from the existing Strawberry Dam will regulate the flows of Strawberry River and its tributaries and the diverted flows of Strawberry Aqueduct prior to diversion to Bonneville Basin through Syar Tunnel. Imported water and all tributary inflows to Strawberry River will be stored in the reservoir except bypasses made for irrigation and minimum stream fishery releases. The estimated average annual storable tributary inflow of the Strawberry River below the existing Strawberry Dam is 19,000 acre- feet. An estimated 400 acre- feet would be bypassed for downstream rights. In addition about 3,000 acre- feet would be conveyed via Strawberry Aqueduct to Strawberry Reservoir from Upper Stillwater Reservoir and then released to the stream below Soldier Creek Dam to help maintain fish habitat of Strawberry River. This water would maintain a 4- to 5- c. f. s. flo » in the river immediately below the dam. Table C- 15 shows the flows that occur historically and those that would occur under Unit conditions 321 |