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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. One system, developed by Arthur Newell Strahler, known as the Strahler stream order ...
The Northern Mojave–Mono Lake subregion is composed of two third-level hydrological units called water resource basins (formerly accounting units), each with its own 6-digit hydrologic unit code. These two basins are further subdivided into a total of 11 water resource subbasins, each with its own 8-unit hydrologic code.
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.
The Souris–Red–Rainy Region, which is listed with a 2-digit hydrologic unit code (HUC) of 09, has an approximate size of 90,759 square miles (235,060 square kilometers), and consists of 3 subregions, which are listed with the 4-digit HUC codes of 0901 through 0903.
The Laguna–San Diego Coastal basin is approximately 3,860 sq mi (10,000 km 2; 2,470,000-acre) and includes the drainage into the Pacific Ocean from Moro Canyon near Laguna Beach to the international border between the United States and Mexico. [3] The Laguna–San Diego Coastal basin is composed of five fourth-level hydrological units called ...
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.
The Great Basin region, which is listed with a 2-digit HUC code of 16, has an approximate size of 141,717 square miles (367,050 square kilometers), and consists of 6 subregions, which are listed with the 4-digit HUC codes of 1601 through 1606. This region includes the drainage of the Great Basin that discharges into the states of Utah and Nevada.