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Abstract: This file contains Hydrologic Unit (HU) polygon boundaries for the United States, Puerto Rico, and the U.S. Virgin Islands. The data is a seamless National representation of HU...
Search relevance: 171.20 | Views last month: 6 | Catalog Last Checked: October 06, 2026 at 11:15 PM -
Hydrologic unit boundaries define the aerial extent of surface water drainage to a point. Hydrologic units through four levels were created in the 1970's and have been used extensively throughout...
Search relevance: 66.73 | Views last month: 1 | Catalog Last Checked: September 10, 2026 at 06:50 PM -
Hydrologic unit boundaries define the aerial extent of surface water drainage to a point. Hydrologic units through four levels were created in the 1970's and have been used extensively throughout...
Search relevance: 66.73 | Views last month: 1 | Catalog Last Checked: September 10, 2026 at 06:49 PM -
This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. Hydrologic unit boundaries define the aerial extent of surface water drainage to a point. Hydrologic...
Search relevance: 59.35 | Views last month: 2 | Catalog Last Checked: September 10, 2026 at 06:48 PM -
The Watershed Boundary Dataset (WBD) is a comprehensive aggregated collection of hydrologic unit data consistent with the national criteria for delineation and resolution. It defines the areal...
Search relevance: 50.03 | Views last month: 84 | Catalog Last Checked: November 01, 2026 at 08:39 AM
