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7 <br /> 4. In general the number of fractures, and the size of fracture openings in bedrock both <br /> decrease with depth. This means it is usually not cost effective to drill a well deeper <br /> than approximately 200 feet. <br /> 5. Two (or more) low-yield wells can more effectively extract groundwater from the <br /> Piedmont groundwater system than one high-yield well. High-yields typically can only <br /> be developed in locations that have abundant and intensive bedrock fracturing and <br /> where the bedrock is overlain by thick saturated regolith. <br /> 6. Choosing a well location should not be based on the view one desires from the building <br /> that will be served by the well. <br /> 7. Minimize impervious surfaces (pavement, buildings and other hard surfaces) on the site <br /> and leave as much undisturbed forest area as possible to increase the recharge of <br /> groundwater in the area. Steep slopes also decrease recharge compared to flatter <br /> areas. <br /> References: <br /> Cunningham, W.L., and Daniel, C.C., III. 2001. Investigation of Ground-Water <br /> Availability and Quality in Orange County, North Carolina. U. S. Geological Survey, <br /> Water-Resources Investigations Report 00-4286. 59 p. <br /> CDM. 2003. Wake County Comprehensive Groundwater Investigation Final Report. <br /> Daniel, C.C., 111. 1996. Ground-Water Recharge to the Regolith-Fractured Crystalline <br /> Rock Aquifer System, Orange County, North Carolina. U. S. Geological Survey, <br /> Water-Resources Investigations Report 96-4220. 59 p. <br /> Daniel, C.C., 111, 1990. Evaluation of Site-Selection Criteria, Well Design, Monitoring <br /> Techniques, and Cost Analysis for Ground-Water Supply in Piedmont Crystalline <br /> Rocks, North Carolina. U. S. Geological Survey, Water-Supply Paper 2341-B. 35 p. <br /> Daniel, C.C., 111, 1987. Statistical Analysis Relating Well Yield to Construction Practices <br /> and Siting of Wells in the Piedmont and Blue Ridge Provinces of North Carolina. <br /> U.S. Geological Survey, Water-Resources Investigations Report 86-4132. 59 p. <br /> Penn State Cooperative Extension, College of Agricultural Sciences. 2015. Water <br /> Facts 5: Water Well Location by Fracture Trace Mapping. 3 p. <br /> State of California, Department of Water Resources, April 1991. Water Facts: Ground <br /> Water in Fractured Hard Rock. 4 p. <br />