A map service on the www depicting hydrologic unit boundary layers for the entire United States. Watershed boundaries provide a uniquely identified and uniform method of subdividing large drainage areas. Watershed boundaries are useful for numerous application programs supported by a variety of local, State, and Federal Agencies. This map service is intended to be used as a tool for water-resource management and planning activities, requiring a level of detail provided by large-scale map information. This map service consists of layers for each hydrologic unit code 2-12. Polygon features are attributed with hydrologic unit codes for 1st(Region), 2nd(Sub-Region), 3rd(Basin), and 4th(Sub-Basin) Hydrologic Unit Level codes, names, Sub-Basin [...]
Summary
A map service on the www depicting hydrologic unit boundary layers for the entire United States. Watershed boundaries provide a uniquely identified and uniform method of subdividing large drainage areas. Watershed boundaries are useful for numerous application programs supported by a variety of local, State, and Federal Agencies. This map service is intended to be used as a tool for water-resource management and planning activities, requiring a level of detail provided by large-scale map information. This map service consists of layers for each hydrologic unit code 2-12. Polygon features are attributed with hydrologic unit codes for 1st(Region), 2nd(Sub-Region), 3rd(Basin), and 4th(Sub-Basin) Hydrologic Unit Level codes, names, Sub-Basin acres and square miles.
This map service consists of geo-referenced digital data and associated attributes created in accordance with the "Federal Guidelines, Requirements, and Procedures for the National Watershed Boundary Dataset; Chapter 3 of Section A, Federal Standards, Book 11, Collection and Delineation of Spatial Data; Techniques and Methods 11-A3" (04/01/2009). The source data is managed by USGS. http://www.nrcs.usda.gov/wps/portal/nrcs/main/national/water/watersheds/dataset.
