Search results
Results From The WOW.Com Content Network
Watersheds of North America are large drainage basins which drain to separate oceans, seas, gulfs, or endorheic basins. There are six generally recognized hydrological continental divides which divide the continent into seven principal drainage basins spanning three oceans ( Arctic , Atlantic and Pacific ) and one endorheic basin.
Originally a four-tier system divided into regions, sub-regions, accounting units, and cataloging units, each unit was assigned a unique Hydrologic Unit Code (HUC). As first implemented the system had 21 regions, 221 subregions, 378 accounting units, and 2,264 cataloging units. [1] [2] Over time the system was changed and expanded. [3]
Major divides separating rivers that drain to different seas or oceans are continental divides. The term height of land is used in Canada and the United States to refer to a drainage divide. [ 2 ] It is frequently used in border descriptions, which are set according to the "doctrine of natural boundaries ". [ 3 ]
The eastern drainage flows into the watersheds of the Roanoke River, Pee Dee River, and Santee River. [5] The divide initially separates the headwaters of the New River from that of the Roanoke River. [3] [4] Just before the Divide passes into North Carolina, it begins to separate the New River and Yadkin River watersheds. It then separates ...
Map of major river basins. These are the major U.S. river basins in the U.S., as designated by the U.S. Water Resources Council. [1] Each of these river basins contain a number of smaller river basins.
The Great Lakes water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the combined ...
A boat floats on the Mekong, in Laos South America's Amazon River (dark blue) and the rivers which flow into it (medium blue). The darker green marks the Amazon's drainage basin or watershed A river is a natural freshwater stream that flows on land or inside caves towards another body of water at a lower elevation , such as an ocean , lake , or ...
The Mississippi River System, also referred to as the Western Rivers, is a mostly riverine network of the United States which includes the Mississippi River and connecting waterways. The Mississippi River is the largest drainage basin in the United States. [3] In the United States, the Mississippi drains about 41% of the country's rivers. [4]