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1. www.usgs.gov › index › toolsHydrologic Unit Maps | U.S. Geological Survey - USGS.gov

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   May 10, 2021 · Each unit is identified by a unique hydrologic unit code (HUC) consisting of two to eight digits based on its classification. This site provides information and data for current and historical hydrologic units, names, and numbers.

2. www.usgs.gov › index › faqsHow can I find the HUC (Hydrologic Unit Code) for a stream ...

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   Each drainage has a unique Hydrologic Unit Code (HUC). The most current national HU dataset is the Watershed Boundary Dataset (WBD) . HUCs from other sources might be out of date or differ from the WBD standards.

3. People also ask

   What is a hierarchical hydrologic unit code (HUC)?

   • A hierarchical hydrologic unit code (HUC) consisting of 2 digits for each level in the hydrologic unit system is used to identify any hydrologic area. fields. An example is shown below using hydrologic unit code 04030203:

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   nas.er.usgs.gov/about/hucs.aspx

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   Where can I find a hydrologic unit code?

   • Go visita USGS HUC site. Hydrologic unit codes were initiated by the U.S. Geological Survey's Office of Water Data in the fall of 1972 in cooperation with the U.S. Water Resources Council and supported by the U.S. Geological Survey's Resources and Land Information program.

   Reference

   digitalatlas.cose.isu.edu/hydr/huc/huctxt.htm

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   What is a hydrologic unit code (HUC) 17040206?

   • An example is given here using hydrologic unit code (HUC) 17040206 for the American Falls area. A double 00 in the two-digit accounting unit field indicates that the accounting unit and the sub-region are the same. Likewise, if the cataloging unit field is 00, it is the same as the accounting unit.

   Reference

   digitalatlas.cose.isu.edu/hydr/huc/huctxt.htm

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   How is a median calculated for a hydrologic unit?

   • For each individual hydrologic unit, the median is based on all the streamgages located within the hydrologic unit. A median is computed for a hydrologic unit only if there are at least four streamgages with a k-day average streamflow percentile located within the hydrologic unit.

   Huc Map Viewer Help - USGS

   waterwatch.usgs.gov/huc_map_help.html

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4. digitalatlas.cose.isu.edu › hydr › hucHydrologic Unit Codes - HUC's

   digitalatlas.cose.isu.edu › hydr › huc

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   Hydrologic unit codes are a way of identifying all of the drainage basins in the United States in a nested arrangment from largest (Regions) to smallest (Cataloging Units).

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5. nsidc.org › hydrologic-unit-code-hucHydrologic Unit Code (HUC) | National Snow and Ice Data Center

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   Hydrologic Unit Code (HUC) hierarchical designation consisting of two additional digits for each level of specificity; established by the US Geological Survey to delineate portions of the United States based on surface features related to the distribution and movement of water.

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7. waterwatch.usgs.gov › huc_map_helpHuc Map Viewer Help - USGS

   waterwatch.usgs.gov › huc_map_help

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   A median is computed for a hydrologic unit only if there are at least four streamgages with a k-day average streamflow percentile located within the hydrologic unit. When creating the hydrologic unit map, the cataloging unit (huc8) medians are drawn on top of the accounting unit (huc6) medians; the accounting unit (huc6) medians are drawn on ...

8. waterwatch.usgs.gov › wwhelpsCalculation of Hydrologic Unit Code (HUC) runoff - USGS

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   Calculation of Hydrologic Unit Code (HUC) runoff. Estimates of hydrologic unit runoff were generated by combining historical flow data collected at USGS streamgages, the respective drainage basin boundaries of the streamgages, and the boundaries of the 2,110 hydrologic cataloging units.