OCR Text |
Show ( b) Utah Valley Water supplies presently available to the Utah Valley area of the proposed Bonneville Unit include the natural flows of the major surface streams including Provo River, Spanish Fork River, American Fork River, Hobble Creek, and smaller mountain front streams; imported storage water from the Strawberry Valley and Provo River Projects; a small storage supply from the Mona Reservoir in northern Juab County; and from Utah Lake. An average supply of 6k0,000 acre- feet enters the valley in surface streams. Of this amount about 165,000 acre- feet is imported from the Weber River and Colorado River Basins. Of the 6U0,000 acre- feet of water entering the valley, 335sOOO acre- feet is diverted by canals for irrigation use. Historically an average of 21,000 acre- feet has been exported to Salt Lake County in the Provo Reservoir Canal. In addition, 26,000 acre- feet from Deer Creek Reservoir has been transported annually through Utah County via the Salt Lake Aqueduct for municipal and industrial use in Salt Lake County. The high flood flows and winter flows entering the valley and not diverted for use contribute to the water supply of existing users of Utah Lake. Only during the infrequent years when Utah Lake spills are there surplus or unused surface waters in the system. About 2,500 acre- feet of water is pumped from Utah Lake for irrigation in the southwest portion of Utah Valley. The bulk of the lake yield, however, is owned by water users in Salt Lake Valley and is used for irrigation and industrial purposes there. The average outflow of the valley through the Jordan River to Jordan Valley is 262,000 acre- feet per year. 1_. Provo River System Rights to the use of waters of the Provo River, the major surface supply to Utah Valley, are based on the 1921 Provo River Decree ( Civil No. 2888) and subsequent applications to the Utah State Engineer to appropriate, change, and exchange. Most of the natural flows are covered by irrigation and power rights with a smaller portion allocated to municipal and industrial use. In accordance with the decree, irrigation users have the right to divert all natural flows during the irrigation season. This results in dry dams with only seepage past the structure and return flows 175 |