The difference between Catchment area and Catchment basin
When used as nouns, catchment area means an area from which water drains into a particular lake, river, etc, whereas catchment basin means a topographic region in which all water drains to a common outlet.
check bellow for the other definitions of Catchment area and Catchment basin
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Catchment area as a noun (hydrology):
An area from which water drains into a particular lake, river, etc.; the catchment area of a large river includes its tributaries.
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Catchment area as a noun:
The area served by a local institution, such as a hospital or school.
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Catchment basin as a noun (hydrology):
A topographic region in which all water drains to a common outlet.