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Show 3,000 acre- feet coming from surface water, and 200 acre- feet from springs. In addition to the privately held water rights used for industrial purposes, many industries use water purchased from wholesale suppliers, primarily the Lake County Water Conservancy District and Metropolitan Water District of Salt Lake City. The Lake County Water Conservancy District makes no effort to delineate how much of its sold water goes to industrial uses, as opposed to commercial or residential uses. The best estimate of district officials is that 5 to 10 percent of their total water sales are used for industrial purposes. The Metropolitan Water District of Salt Lake City, on the other hand, regularly surveys the use of its sold water. Data collected between 1978 and 1993 show sales for industrial uses consistently at 5 percent of its total sales or about 4,400 acre- feet annually. Water planners and managers need to provide for the future construction of treatment and distribution facilities to accommodate an expected increase in industrial water demand. In contrast to residential and commercial water uses which grow somewhat uniformly with population, future industrial use is difficult to predict. Future industrial uses could decline as industry types change or industries employ water conservation programs. In an effort to predict future water demands, it has been assumed industrial water use will grow with the increasing population. Without an accurate prediction of the new kinds of industries which will occur, it will not be possible to make an accurate prediction of industrial water growth. Utah Power has two hydroelectric power plants in Big Cottonwood Canyon. The first is located approximately two miles up the canyon. The second is located near the mouth of the canyon. Water for both plants is diverted from a point near Storm Mountain picnic area approximately half- a- mile upstream from the first plant. Murray City has a hydroelectric power plant located near the mouth of Little Cottonwood Canyon, and the plant diverts water from the stream through a 30- inch penstock about one mile upstream ( See Table 18- 2). • Table 18- 1 PRESENT INDUSTRIAL WATER USE j Privately held water rights1 Surface water Springs Wells Public Water Supply - Culinary Systemsb Imported from Tooele County by Kennecott Utah Copper TOTAL Acre- feet/ year 3,000 200 26,500 15,400 10,000 55,100 a. Water use data provided by State Engineer's Office. b. Wasatch Front Water Demand/ Supply Model, February 1997. Note: This table does not include water used to generate hydropower. Table 18- 2 HYDROELECTRIC POWER PLANTS Name River Capacity ( kw) a) Owner Stairs Power Plant # 1 Stairs Power Plant # 2 Murray City Power Plant Big Cottonwood Creek Big Cottonwood Creek Little Cottonwood Creek 500 1000 1000 Utah Power Utah Power Murray City ( a) Department of Natural Resources, Energy office 1980, A survey of small hydroelectric potential at existing sites in Utah. 18- 2 |