drainage basin
noun1
Geography, Hydrology, Natural sciences A topographic region in which all water drains to a common outlet; a watershed.
- The efficient evaluation of these plans, which may include the construction of dams, reservoirs, and settling basins, requires information on sediment transport in the Cache Creek drainage basin.1967, Lawrence K. Lustig, Robert D. Busch, Sediment Transport in Cache Creek Drainage Basin in the Coast Ranges West of Sacramento, California, page 2: