A unique code, consisting of two to eight digits, used to identify units (watersheds) in the U.S. Geological Survey's four-level classification system
FEMA, Robin Danforth, P.E.(Study Manager - FEMA/DHS Region III), USA), Glossary & Acronyms, Coastal Study Home, Storm Surge Study, Coastal Hazard Analysis & Mapping, Philadelphia, PA, 2015. http://www.r3coastal.com/Glossary--Acronyms, (CoaStormEmr - Amer) {883}