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Glossary of Karst and Cave Terms
Based on "A Lexicon of Cave and Karst Terminology with Special to Environmental Karst Hydrology" EPA/600/R-02/003, 2002, EPA: Washington, DC., Speleogenesis Glossary includes 2699 cave & karst terms
equipotential line or surface
1. A contour line on the potentiometric surface along which the pressure head of ground water in the aquifer is the same. Fluid flow is normal to these lines in the direction of decreasing fluid potential . 2. Line (or surface) along which the potential is constant .