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drainage basin:see catchment areacatchment area
or drainage basin,
area drained by a stream or other body of water. The limits of a given catchment area are the heights of land—often called drainage divides, or watersheds—separating it from neighboring drainage systems.
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drainage basin[′drān·ij ‚bā·sən]
An area in which surface runoff collects and from which it is carried by a drainage system, as a river and its tributaries. Also known as catchment area; drainage area; feeding ground; gathering ground; hydrographic basin.
The area within which all surface water flows toward the lowest point of its elevation.