Question

What do you mean catchment area of a project
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Answer 1

In human geography, a catchment area is the area from which a city, service or institution attracts a population that uses its services.

Hope its helpfull

Answer 2

HelpCenter Definition. 1) An area from which surface runoff is carried away by a single drainage system. 2) The area of land bounded by watersheds draining into a river, basin or reservoir.