A permeable region of rock or soil through which ground water can move.


There are layers of impermeable material both above and below the aquifer such that it is under pressure. If the aquifer is penetrated by a well, the water will rise above the top of the aquifer.


An aquifer whose upper water surface (water table) is at atmospheric pressure, and thus is able to rise and fall.

See also: Artesian Well.

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Subjects: Geology