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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 ...
A hydrological code or hydrologic unit code is a sequence of numbers or letters (a geocode) that identify a hydrological unit or feature, such as a river, river reach, lake, or area like a drainage basin (also called watershed in North America) or catchment.
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.
Water resource basins of the Southern California coastal subregion (HUC 1807). Southern California Coastal water resource subregion (HUC 1807) is one of 10 hydrologic subregions within the California water resource region and is one of 222 water resource subregions in the United States hydrologic unit system.
Pages in category "United States hydrologic unit system" The following 2 pages are in this category, out of 2 total. This list may not reflect recent changes .
The Ventura–San Gabriel Coastal water resource basin is a third-level subdivision of the United States hydrologic unit system. [1] The Ventura–San Gabriel Coastal basin is approximately 4,530 sq mi (11,700 km 2; 2,900,000-acre) and extends from Rincon Creek on the north to the San Gabriel Basin on the south. [2]
The Laguna–San Diego Coastal water resource basin is a third-level subdivision of the United States hydrologic unit system. [1] The tiers of the classification system, in order from largest to smallest, are regions, subregions, basins (formerly accounting units), subbasins (formerly cataloging units), watersheds, and subwatersheds. These ...
There are two water resource basin subdivisions of the Northern Mojave–Mono Lake subregion (HUC 1809). Northern Mojave–Mono Lake water resource subregion (HUC 1809) is one of 10 water resource subregions within the California water resource region and is one of 222 water resource subregions in the federally organized United States hydrologic unit system.