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Watershed

The total land area, regardless of size, above a given point on a waterway that contributes runoff water to the flow at that point. A major subdivision of a drainage basin. the United States is generally divided into 18 major drainage areas and 160 principal river drainage basins containing some 12,700 smaller watersheds.

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watershed
Natural environment; Coral reefs

An area of land that drains downslope to the lowest point. The water moves through a network of subterranean and surface drainage pathways which converge into streams and rivers, ...

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Weather; Meteorology

1. Same as river basin. In this sense, the term is most commonly applied to relatively small areas. 2. Same as divide. (Apparently this use is becoming obsolete. )

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Earth science; Geology

A region that includes a river and all its tributaries. Rain or snow that falls anywhere in the same watershed will flow to the same river.

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Energy; Hydro dam; Dam safety

The area drained by a river or river system or portion thereof. The watershed for a dam is the drainage area upstream of the dam.

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Fishing; Marine fishery

The areas which supplies water by surface and subsurface flow from rain to a given point in the drainage system.

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The land area from which surface runoff drains into a stream, channel, lake, reservoir, or other body of water; also called a drainage basin.

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