1. 
   Drainage Basin
   The area of land that drains water, sediment, and dissolved materials to a common outlet at some point along a stream channel.
   Found op http://www.epa.gov/OCEPAterms/
   
   
2. 
   Drainage basin
   Total area drained by a stream and its tributaries.
   Found op http://www.ecy.wa.gov/programs/sea/swces/products/glossary.htm
   
   
3. 
   drainage basin
   area from which all precipitation flows to a single stream or set of streams. For example, the total area drained by the Mississippi River ... [9 related articles]
   Found op http://www.britannica.com/eb/a-z/d/72
   
   
4. 
   Drainage basin
   A drainage basin (also known as a watershed) is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean. ...
   Found op http://en.wikipedia.org/wiki/Drainage_basin
   
   
5. 
   Drainage Basin
   Land surface region drained by a length of stream channel.
   Found op http://www.physicalgeography.net/physgeoglos/d.html
   
   
6. 
   drainage basin
   drainage basin: see catchment area.
   Found op http://www.infoplease.com/ce6/sci/A0912670.html
   
   
7. 
   drainage basin
   Area of land drained by a river system (a river and its tributaries). It includes the surface run-off in the water cycle, as well as the water table. Drainage basins are separated by watersheds. A drainage basin is an example of an open system because it is open to inputs from outside, such as preci...
   Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0035053.html
   
   
8. 
   Drainage Basin
   The area of land drained by a river system.
   Found op http://volcano.oregonstate.edu/education/glossary.html
   
   
9. 
   Drainage Basin
   The area of land that is drained by a river and its tributaries. The boundary of a river basin is called the watershed.
   Found op http://www.encyclo.co.uk/local/21748
   
   

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