The difference between Catchment basin and Drainage basin
When used as nouns, catchment basin means a topographic region in which all water drains to a common outlet, whereas drainage basin means a topographic region in which all water drains to a common outlet.
check bellow for the other definitions of Catchment basin and Drainage basin
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Catchment basin as a noun (hydrology):
A topographic region in which all water drains to a common outlet.
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Drainage basin as a noun (hydrology):
A topographic region in which all water drains to a common outlet; a watershed.