The pumpage of fresh ground water in the United States in 1995 was estimated to be approximately 77 billion gallons per day (Solley and others, 1998), which is about 8 percent of the estimated 1 trillion gallons per day of natural recharge to the Nation's ground-water systems (Nace, 1960). From an overall national perspective, the ground-water resource appears ample. Locally, however, the availability of ground water varies widely. Moreover, only a part of the ground water stored in the subsurface can be recovered by wells in an economic manner and without adverse consequences.
|Title||Sustainability of ground-water resources|
|Authors||William M. Alley, Thomas E. Reilly, O. Lehn Franke|
|Publication Subtype||USGS Numbered Series|
|Record Source||USGS Publications Warehouse|