Data Basin is a science-based mapping and analysis platform that supports learning, research, and sustainable environmental stewardship.
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Derived from 1:250,000-scale USGS HUC 8 boundaries, this dataset
represents Mannings "n" surface roughness coefficient
for the western USA. A weighted average was created for each HUC 8
watershed using approximate EMAP physical habitat substrate criteria.
Data Provided By:
US EPA/ORD/NERL/ESD Landscape Ecology Branch, SEDMOD
http://www.epa.gov/esd/land-sci/emap_west_browser/pages/wemap_download.htm
Layers in this dataset are based on combinations of the following options.
You may choose from these options to select a specific layer on the map page.