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
The height above a datum plane (such as sea level) of the column of water that can be supported by the hydraulic pressure at a given-point in a ground-water system. For a well, the hydraulic head is equal. to the distance between the water level in the well and the datum plane .