The 21 Water Resources Regions of the United States as designated by the Water Resources Council are further subdivided into 222 sub-regions. Each sub-region includes that area drained by a river system, a reach of a river and its tributaries in that reach, a closed basin(s), or a group of streams forming a coastal drainage system.
WATER RESOURCES SUB-REGION (UNITED STATES)
Meaning of WATER RESOURCES SUB-REGION (UNITED STATES) in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012