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  2. Hydrologic unit system (United States) - Wikipedia

    en.wikipedia.org/wiki/Hydrologic_unit_system...

    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 ...

  3. Water resource region - Wikipedia

    en.wikipedia.org/wiki/Water_Resource_Region

    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.

  4. Laguna–San Diego Coastal water resource basin - Wikipedia

    en.wikipedia.org/wiki/Laguna–San_Diego_Coastal...

    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 ...

  5. Hydrological code - Wikipedia

    en.wikipedia.org/wiki/Hydrological_code

    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.

  6. Category:United States hydrologic unit system - Wikipedia

    en.wikipedia.org/wiki/Category:United_States...

    Hydrologic unit system (United States) W. Water resource region This page was last edited on 2 April 2024, at 21:46 (UTC). Text is available under the Creative ...

  7. California water resource region - Wikipedia

    en.wikipedia.org/wiki/California_Water_Resource...

    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.

  8. Pacific Northwest water resource region - Wikipedia

    en.wikipedia.org/wiki/Pacific_Northwest_Water...

    The Pacific Northwest 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 to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the ...

  9. Missouri water resource region - Wikipedia

    en.wikipedia.org/wiki/Missouri_Water_Resource_Region

    The Missouri 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 to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the combined ...