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

drainage basin
The land area from which surface runoff drains into a stream channel or system of stream channels, or to a lake, reservoir, or other body of water [6]. In a karst setting, subsurface drainage (internal drainage) may have boundaries defined on the basis of comprehensive ground-water tracing studies. See also ground-water basin.