Groundwater is in most cases fresh, or potable, water that has infiltrated into a subsurface environment from the surface. The earth material that contains this water is a groundwater aquifer that has pore spaces (porosity) and connections between them (permeability). The porosity and permeability allows active infiltration into and subsequent percolation through the system. If the aquifer is currently inactive, and functions more as storage of groundwater, it is also known as a groundwater resevoir.

Russell J. Wernlund

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