Wetlands can be classified and assessed in many ways. Delineating and classifying wetlands is complex and must be conducuted by wetland experts. In Minnesota the Wetland Conservation Act (WCA) prescribes the methods used for delineating wetland boundaries, determining wetland types and assessing wetland functions.
Wetland Classifications and Types
The Minnesota Wetland Conservation Act requires wetland types be determined according to Wetlands of the United States, (1971 edition) and the Minnesota Wetland Conservation Act also adopts by reference the Classification of Wetlands and Deepwater Habitats of the United States.
The U.S. Army Corps of Engineers also recognizes the hydrogeomorphic classification.
In 1993 the Corps published a report titled “A hydrogeomorphic classification for wetlands”, whose purpose is to facilitate the development of improved models for evaluation of wetland functions by grouping functionally similar wetland types. The hydrogeomorphic (HGM) classification is not meant to replace other wetland classification systems.
Source: Wetlands Management Handbook, U.S. Army Engineer Research and Development Center