World English Dictionary
catchment area
1.  catchment basin, drainage area, Also called: drainage basin the area of land bounded by watersheds draining into a river, basin, or reservoir
2.  the area from which people are allocated to a particular school, hospital, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
catchment area   (kāch'mənt, kěch'-)  Pronunciation Key 
  1. The area drained by a river or body of water.

  2. The area that absorbs water that contributes to a specific region's groundwater supply.

The American Heritage® Science Dictionary
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