Potentiometric Surface A surface which represents the static head of ground water in tightly cased wells that tap a water-bearing rock unit (i.e., aquifer). In relation to an aquifer, the potentiometric surface is defined by the levels to which water will rise in tightly cased wells. If the head varies significantly with depth in the aquifer, then there may be more than one potentiometric surface. The Water Table is a particular potentiometric surface for an Unconfined Aquifer. This term has generally replaced the term Piezometric Surface.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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