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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.
Map showing the Chestatee River area, with its source near Blood Mountain, ... 0313000106, and 0313000107, and 14 sub-watersheds, listed below. HUC-10 0313000105.
The Missouri region, which is listed with a 2-digit hydrologic unit code (HUC) of 10, has an approximate size of 520,960 square miles (1,349,300 square kilometers), and consists of 30 sub-regions, which are listed with the 4-digit HUCs 1001 through 1030.
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.
The Hydrologic Unit Code (HUC-12) for the Little Buffalo is 060400040106. The Little Buffalo is a part of the Upper Buffalo River watershed which is HUC-10 0604000401. The Little Buffalo is a part of the Upper Buffalo River watershed which is HUC-10 0604000401.
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.
Basin HUC [4] Basin name [4] Basin description Basin location [4] Basin size [4] Basin map 180701 Ventura–San Gabriel Coastal water resource basin: The drainage into the Pacific Ocean from the Rincon Creek Basin boundary to and including the San Gabriel River Basin. [5] Ventura County, Los Angeles County: 4,530 sq mi (11,700 km 2) HUC180201 ...