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Noun

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drainage basin (plural drainage basins)

  1. (hydrology) A topographic region in which all water drains to a common outlet; a watershed.
    Synonyms: (US) watershed, catchment area, catchment 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:
      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.

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