| OCR Text |
Show drawn down during a general drought period extending from 1955 to the low year of 196l when the lake again approached minimum levels. A chart showing the average historic inflow and outflow of Utah Lake for the 1920- 1963 period is shown in Figure B- 5. Historically, the demands on the lake have not been uniform and excessive drafts of water in the years prior to 1930 contributed to the severe water shortages. On the basis of past experience and the pattern of operation in recent years, it is expected that without the proposed Bonneville Unit the lake would be operated in the future on a more normal annual yield basis to avoid acute and frequent shortages during prolonged drought periods. The level to which Utah Lake is drawn down in years to come would depend on the future demands imposed on the lake and the extent to which additional groundwater development takes place in Utah Valley. ( c) North Juab Valley Water supplies available to the north Juab Valley area are principally from Salt Creek and smaller front streams, springs, and wells. An average supply of 2^, 700 acre- feet of water enters the valley in surface streams. Of this amount 18,700 acre- feet is diverted by canals for irrigation use. All base flows of the surface streams entering the valley are appropriated for irrigation and other uses. Winter flows and excess spring flows not diverted are stored in Mona Reservoir for use in Goshen Valley. This inflow to Mona Reservoir averages 15,000 acre- feet per year. Municipal and industrial demands in northern Juab Valley are satisfied from potable spring and well water not requiring treatment. At the present time about 3,000 acre- feet of spring water is available for municipal and industrial use. As the supply of high quality spring water is depleted, treatment facilities would be needed in future years to treat surface water for municipal use. The surface water from the front streams and most springs and wells are of suitable quality for culinary uses. The remainder of the springs and groundwater is lower in quality and is limited to irrigation and industrial use. There is very little possibility within the valley for additional surface or underground water supply development. 179 |
