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Nonetheless, hydrologic units and watersheds are commonly treated as synonymous, and this misapplication and misunderstanding can have some serious scientific and management consequences." [9] Aquifers of the United States are organized by national principal aquifer codes and names assigned by the National Water Information System (NWIS).
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.
Watershed Boundary Dataset Subregions Map for the United States, created by the US Geological Survey. This list is non-exhaustive, as many organizations and territories have produced their own watershed map data and have published via the web. Notable datasets include: United States Watershed Boundary Dataset, [35] website (continually updated)
This point divides the eastern United States into three watersheds: those of the Genesee River flowing into Lake Ontario and then the St. Lawrence River to the north; Pine Creek into the Susquehanna River as part of the Atlantic seaboard watershed to the east; and the Allegheny River into the Ohio, the Mississippi, and the Gulf of Mexico to the ...
The NHD is part of the United States Geological Survey The National Map for the United States. The NHD is also linked with similar datasets representing the surface water for Canada and Mexico. The dataset primarily maps features a 1:24,000-scale, but in certain areas provides detail at 1:5,000-scale.
Map of the Great Basin. The Great Basin is the largest region of contiguous endorheic drainage basins in North America, and is encompassed by the Great Basin Divide.This is a list of the drainage basins in the Great Basin that are over 500 sq mi (1,300 km 2), listed by the state containing most of the basin.
This is a map from Page 11 of a work (link below) mandated by the Environmental Protection Agency (EPA) of the US Government. The U.S. Congress mandated that all states develop a Source Water Assessment Program in the "1966 Safe Drinking Water Act".
This area is alternatively known as simply the Apalachicola Basin and is listed by the United States Geological Survey as basin HUC 031300, as well as sub-region HUC 0313. It is located in the South Atlantic-Gulf Water Resource Region, which is listed as HUC 03. The basin is further sub-divided into 14 sub-basins.