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Aquifer - A geological formation that contains sufficient saturated permeable material to yield significant quantities of water to wells and springs.
Aquifer Stress Assessment - Water use is sustainable when supply and demand are in balance. When more water is extracted than replenished, an aquifer may experience stress. Aquifer stress compares the total demand for groundwater to the amount of natural aquifer recharge.
Aquitard - A geological formation, or part of a formation, through which virtually no water moves.