General term used to define a groundwater flow system that has defined boundaries and may include more than one aquifer. The basin includes both the surface area and the permeable materials beneath it. A rather vague designation pertaining to a groundwater reservoir that is more or less separate from neighboring groundwater reservoirs. A groundwater basin could be separated from adjacent basins by geologic boundaries or by hydrologic boundaries.

The underground area from which groundwater drains. The basins could be separated by geologic or hydrologic boundaries.

Interconnected permeable geologic material capable of storing a significant ground-water supply surrounded by less permeable material. ground-water mining The pumping of more ground water from an aquifer than in replaced by recharge

groundwater flow system bounded by groundwater divides.