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Wetland Codes and Definitions
NWI
Map Codes Search Form. Type the wetlands code (ex: PFO1A) into the form to get the Service description
and definition.
The South Carolina Department of Natural Resources also has an NWI-code tool withh basic search capability: NWI Wetlands Classification Decoder.
Wetlands and Deepwater Habitats Classification Map Legend. Map code diagram to show codes and relationship of wetland systems (ex: estuarine), subsystems (ex: intertidal), and classes (ex: emergent wetland). Alphabetical list of codes.
National Wetlands Classification Standard. Our map codes of wetland habitat types use the classification system in this Service publication: Classification of Wetlands and Deepwater Habitats of the United States, 1979, by Cowardin, Lewis M. et al.