(1) A defined geographical area, usually delineated by high ground, that drains to a watercourse. (2) Region or area contributing to the supply of a stream or lake; drainage area, drainage basin, catchment area.
(1) A defined geographical area, usually delineated by high ground, that drains to a watercourse. (2) Region or area contributing to the supply of a stream or lake; drainage area, drainage basin, catchment area.