20211201 15134100 1.0 TRUE TRUE USGS NHD Hydrologic Units The intent of defining Hydrologic Units (HU) within the Watershed Boundary Dataset is to establish a base-line drainage boundary framework, accounting for all land and surface areas. Hydrologic units are intended to be used as a tool for water-resource management and planning activities particularly for site-specific and localized studies requiring a level of detail provided by large-scale map information. The WBD complements the National Hydrography Dataset (NHD) and supports numerous programmatic missions and activities including: watershed management, rehabilitation and enhancement, aquatic species conservation strategies, flood plain management and flood prevention, water-quality initiatives and programs, dam safety programs, fire assessment and management, resource inventory and assessment, water data analysis and water census. NHD December 17, 2019 https://www.usgs.gov/core-science-systems/ngp/national-hydrography Download from https://viewer.nationalmap.gov/basic/?basemap=b1&category=nhd&title=NHD%20View 16-digit Hydrologic Unit Code Region US 4-digit HUC United States Watershed Boundary Dataset 2-digit Basin 10-digit Hydrologic Units Sub-basin Watershed WBD 6-digit inlandWaters Sub-region Subwatershed 12-digit 14-digit 8-digit Hydrologic units are intended to be used as a tool for water-resource management and planning activities particularly for site-specific and localized studies requiring a level of detail provided by large-scale map information. 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