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Infographic explaining the hierarchy of the United States hydrologic unit system. 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 ...
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.
A map of the principal hydrological divides of North America.The Eastern Continental Divide (orange line) demarcates two watersheds of the Atlantic Ocean: the Gulf of Mexico watershed and the Atlantic Seaboard watershed.
A water resource region is 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 as part of the U.S. hydrologic unit system. This first level of classification divides the United States into 21 major geographic areas, or regions.
California region, with its 10 4-digit subregion hydrologic unit boundaries. The California 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 in the United States hydrologic unit system, which is used to divide and sub-divide the United States into successively smaller hydrologic units.
Map of the watershed of the Lost Creek Reservoir in Morgan County, Utah, United States, showing the major streams in blue and the watershed boundary in red. Computerized methods for watershed delineation use digital elevation models (DEMs), datasets that represent the height of the Earth's land surface.
This list ranks the top 150 U.S. cities (incorporated places) by 2024 land area.Total areas including water are also given, but when ranked by total area, a number of coastal cities appear disproportionately larger.
Basin Type Continent Drains to Basin area Notes km 2 mi 2; Atlantic Ocean: Ocean: Multiple: n/a: 69,800,000 26,900,000 [Note 1] [2]Arctic Ocean: Ocean: Multiple: n/a ...