UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave Terms

1. A line connecting the highest topographic elevations or ground-water crests that separate one drainage basin from another [16]. 2. A ridge in the water table or potentiometric surface from which the ground water represented by that surface moves away in both directions. Water in other aquifers above or below, and even in the lower part of the same aquifer, may have a potentiometric surface lacking the ridge, and so may flow past the divide. See also ground-water divide; water-table divide. Synonyms: ground-water divide; groundwater ridge; water-table divide. 3. (a) The line of separation, or the ridge, summit, or narrow tract of high ground, marking the boundary between two adjacent drainage basins or dividing the surface waters that flow naturally in one direction from those that flow in the opposite direction; the line forming the rim of or enclosing a drainage basin; a line across which no water flows. 3. (b) A tract of relatively high ground between two streams; a line that follows the summit of an interfluve [1]. See also drainage divide.