Definition

1. Noun:
   • A watershed; the entire geographical area drained by a river and its tributaries: A "drainage area" is a region of land where all precipitation and surface water flow converges into a single river system, ultimately reaching the same outlet, such as an ocean or lake.
   • A catchment basin: It is an area characterized by all water runoff being conveyed to the same point.

Usage Examples

• Noun:
  • The Mississippi River's drainage area covers a significant portion of the United States.
  • Effective land management within a drainage area is crucial for water quality downstream.
  • The flood control project focused on the entire drainage area of the Missouri basin.

Advanced Usage

• "to delineate a drainage area": to map or define the boundaries of a watershed.
  • Hydrologists used topographic maps to delineate the drainage area.
• "urban drainage area": a catchment basin significantly altered by urban development, affecting runoff patterns.
  • The city's engineers designed new systems to manage stormwater in the urban drainage area.

Variants and Related Words

• Watershed (n): A synonym for drainage area; the dividing line between two catchment basins.
• Catchment (n): The action of collecting water, or the area from which water is collected.
• River basin (n): Often used interchangeably with drainage area, emphasizing the river system.
• Drainage basin (n): A direct synonym for drainage area.

Synonyms

• Watershed
• Catchment basin
• River basin
• Catchment area

Related Phrases

• Drainage system: The network of natural and artificial channels that carry water from a drainage area.
  • The aging drainage system could not handle the volume of runoff from the drainage area.
• Drainage divide: The boundary (often a ridge) separating adjacent drainage areas.
  • The mountain range forms the drainage divide between the two major basins.

Related Concepts

• Runoff: Water from rain or snowmelt that flows over the land surface, eventually entering a drainage area's streams.
• Outlet: The single point (e.g., a river mouth) where all water from a drainage area discharges.
• Tributary: A river or stream that flows into a larger river within a drainage area.

Noun

1. the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet
   • flood control in the Missouri basin