Click a link below for more information about wetland classification systems. 

All documents are available courtesy of the US Fish and Wildlife Service and Georgia Department of Natural Resources Coastal Resources Division


NWI (Cowardin) Classification


Classification of Wetlands and Deepwater Habitats of the United States 2nd Edition (1.4MB PDF)

Classification of Wetlands and Deepwater Habitats of the United States 1st Edition (17MB PDF)

NWI Map Code Diagram (PDF) outlines the relationship of wetland systems, subsystems, classes and subclasses.

NWI Water Regime Restriction Table (PDF) a guide to wetland code compliance.

Data Collection Requirements and Procedures for Mapping Wetland, Deepwater and Related Habitats of the United States -version 2 (1.8MB PDF)

A Guide to Understanding National Wetlands Inventory Mapping Codes

National Wetlands Inventory Attribute Decoder


NWI Plus (LLWW) Classification


Dichotomous Keys and Mapping Codes for Wetland Landscape Position, Landform, Water Flow Path, and Waterbody Type Descriptors

What is LLWW?

Predicting Wetlands Functions at the Landscape Level for Coastal Georgia Using NWIPlus Data

Georgia's NWI Report 2012

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