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Show Table 5- 7 WATER USE vs SUPPLY ( 1995) Jordan River Basin Present Use ( acre- feet/ year) Present Supply* ( acre- feet/ year) Unused Supply Potable Public water system: ^ Residential 164,600 - Commercial/ institutional 77,200 - - Industrial 15.400 - - Subtotal 257,200 328,410 75,950 Private domestic systems: 24,600 24,600 - Self- supplied industrial 26.500 26.500 - Subtotal 51,100 51,100 Total potable 308,300 384,250 75,950 Non- Potable Secondary Residential 10,000 10,000 Self- supplied industrial 13,200 13,200 - Agricultural 126,500 143,000 16,500 | Developed wetlands 94.500 94.500 - Total non- potable 244.200 260.700 - Total water 552,500 644,950 92,450 * Reliable supply for nine out of 10 years 1995 industrial use supplied by public water systems at 15,400 acre- feet. Approximately 90,000 people within the basin are not supplied by a public water system. An estimated 24,600 acre- feet of water is pumped by individual wells and used in private domestic systems. Self- supplied industrial water use, from data supplied by the Division of Water Rights, is an estimated 39,700 acre- feet. Of that amount, 26,500 acre- feet is groundwater, 3,200 acre- feet is non- potable surface and spring water, and 10,000 acre- feet is water from Tooele County Secondary water systems can reduce the demand for treated water by providing lower quality water for such uses as watering lawns and gardens and other outside uses. At the present time, there are few secondary water systems in the Jordan River Basin. Draper and South Jordan secondary irrigation systems are the most significant in size, although other small secondary systems are in Riverton, Bluffdale and West Jordan. Annual secondary water use is estimated at 10,000 acre- feet per year. Reducing the demand for culinary water by retrofitting existing subdivisions with secondary water systems has potential. Studies indicate, however, that constructing a secondary system for existing urban subdivisions would be very expensive. Retrofitting existing subdivisions with a secondary system would cost as much or more than the savings associated with reduced water treatment. Information on conserving water through secondary water systems is in Section 17, Water Conservation/ Education. 5.4.2 Agricultural The land use mapping by the Division of Water Resources in 1994 indicates the present active irrigated lands include about 25,300 acres. The irrigated cropland consists of about 27 percent alfalfa, 36 percent pasture/ grass hay land, 16 percent grain and corn, and less than 2 percent orchard and vegetables. The balance is idle and fallow ground. 5- 11 |