Subwatershed
Topographic perimeter of the catchment area of a stream tributary.
Source: Terms of the Environment ...
SUBWATERSHED
A smaller geographic section of a larger watershed unit with a drainage area of between 2 to 15 square miles and whose boundaries include all the land area draining to a point where two second order streams combine to form a third order ...
 See also: River, Catchment, Watershed, Solution, Criteria
  
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