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Ground Water <br /> <br /> It has been estimated by the North Carolina Department of Natural <br />Resources and Community Development that as much as 350,000 gallons <br />of water per day per square mile is available under Cabarrus County. <br />However, the majority of the county is underlain by igneous rock <br />types not known for large yielding wells. According to well drilling <br />records, wells have yielded from 0-150 gallons per minute (gpm) de- <br />pending on the type of rock and topographic location of the well. <br />Average yield is 12.5 gallons per minute. Average depth is 150 feet. <br /> <br /> Based upon this average yield a well could supply 18,000 gallons <br />per day (gpd). To supply 4.86 MGD, 270 wells would be required, not <br />including back-up capacity for down-time on the wells for repair <br />and maintenance. At an average cost of $20,000 per well the cost of <br />building the wells would be $5,400,000. Cost of extracting water <br />from the wells, but not distributien, would be $964,980/year based <br />on 5¢ per kilowatt-hour, and an average well depth of 162 feet. <br /> <br />~urface Water Without Impoundment <br /> <br /> 0nly one source in Cabarrus County has sufficient flow to meet <br />the additional water demand 19 out of 20 years. It is the Rocky <br />River, located in southern Cabarrus County, about six (6) miles <br />from Concord at its closest point. Its elevation is approximately <br />550 feet at this point. Extensive pumping would be required as <br />the major water use areas (Concord and Kannapolis) have elevations <br />of 700 to 800 feet. The river has a stream classification D. This <br />poor water quality would increase treatment costs. <br /> <br /> It should be'noted that the Rocky River has sufficient flow only <br />19 out of 20 years. How water would be supplied during a drought is <br /> <br /> <br />