Recharge to High Yield Wells in the Piedmont
Dowd, John F.
Marshall, Jane E.
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Currently most of the municipal water supplies in the Piedmont are from surface water, although there is increasing interest in developing groundwater sources. The igneous and metamorphic rocks contain little primary porosity and very low primary permeability; flow occurs in fractures. High yield wells require fracture zones such as faults or lithologic contacts. While flow in these zones may be rapid, the volume of water stored in the fractures is limited. Recharge to the fracture zone is principally from the saprolite. High pumping rates can only be sustained by induced recharge from surface water bodies or thick saturated saprolite.