UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave 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 [6]. 2. Line (or surface) along which the potential is constant [22].