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UIS Commission on Karst Hydrogeology and Speleogenesis

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Glossary of Karst and Cave Terms

Field, M.S., 1999, A lexicon of cave and karst terminology with special reference to environmental karst hydrology: U.S. Environmental Protection Agency, National Center for Environmental Assessment, EPA/600/R-99/006, 201 p.

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Term	Description
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unaltered rock	Rock that has not experienced physical or chemical erosion [16].		View
unconfined	A condition in which the upper surface of the zone of saturation forms a water table under atmospheric pressure [22].		View
unconfined aquifer	An aquifer where the water table is exposed to the atmosphere through openings in the overlying materials.		View
unconfined flow	Ground-water flow displaying a free surface [16].		View
unconfined water	Ground water vertically in direct contact with the atmosphere [16].		View
unconformity	A fossil land surface representing the absence of a sequence of sediments [16].		View
unconformity spring	See spring, unconformity.		View
uncontaminated zone	In electrical logging practice, the zone around a borehole that has not become contaminated by mud filtrate [16].		View
undercut karren	These are Rinnenkarren (solution grooves) that have been transformed by humus filling and by their side walls having been hollowed ...		View
underdrainage	The drainage from under a hydrologic feature such as a river, barrier, lake, etc.		View
underfit stream	A small stream that flows along a cave passage that was enlarged to its current size by an earlier, larger ...		View
underflow	Deep phreatic flow within an aquifer, along flow lines that are largely unrelated to the more obvious flow at higher ...		View
underflow spring	See spring, underflow.		View
underground divide	Subsurface watershed between two catchment areas in karst; often with incongruent with the surface topography of the area [20]. Synonyms: ...		View
underground river, underground stream	Water flowing in channels through caves, caverns, and larger galleries in karst terranes [20]. Synonyms: (French.) riviere souterraine; (German.) Hohlenflu., ...		View

Glossary references