subbasin

English

Etymology

From sub- +‎ basin.

Noun

subbasin (plural subbasins)

1. (geography) A basin within a larger basin.
   • 2009 May 14, Felicity Barringer, “Rising Calls to Regulate California Groundwater”, in New York Times‎:

     Since 2006 the surface of the aquifer, in the Kaweah subbasin of the San Joaquin basin, has dropped 50 feet as farmers pumped deeper, Mr. Watte says.