Key to Hydrogeomorphic Wetland Classes and Regional Subclasses * 



1 . Wetland is under the influence of tides 2 



1 . Wetland is not under the influence of tides 4 



2. Salinity greater than 30 ppt Tidal Fringe (Euhaline) 



2. Salinity less than 30 ppt 3 



3. Salinity 5-30 ppt Tidal Fringe (Mixohaline) 



3. Salinity less than 5 ppt Riverine (Tidal) 



4. Wetland is topographically flat and has precipitation as a dominant 



source of water 5 



4. Wetland is not topographically flat and does not have precipitation 



as a dominant source of water 6 



5. Wetland has a mineral soil Mineral Soil Flats 



5. Wetland has an organic soil Organic Soil Flats 



6. Wetland is associated with a stream channel, floodplain, or terrace 7 



6. Wetland is associated with a topographic depression 



or on a topographic slope or flat 9 



7. Stream is intermittent or ephemeral Riverine (Nonperennial) 



7. Stream is perennial 8 



8. Stream is 1st or 2nd order Riverine (Upper perennial) 



8. Stream is 3rd order or higher Riverine (Lower perennial) 



9. Wetland located in a natural or artificial (dammed) topographic depression 10 



9. Wetland located on a topographic slope 13 



10. Topographic depression has permanent water >2 meters deep, 



and wetland is restricted to the margin of the depression Lacustrine Fringe 



1 0. Topographic depression does not contain permanent water >2 meters deep 11 



1 1 . Topgraphic depression closed without discernable surface 



water inlets, outlets, or other connections Depression (Closed) 



1 1. Topographic depression open with discernable surface water inlets, 



outlets, or other connections 12 



12. Primary source of water is ground water Depression (Open, Ground Water) 



12. Primary source of water is precipitation, 



overland flow, or interflow Depression (Open, Surface Water) 



13. Primary source of water is ground water Slope 



1 3. Primary source of water is precipitation Organic Soil Flats 



Hydrogeomorphic classes are followed by regional subclass in parenthesis 



Key to hydrogeomorphic wetland classes and regional subclasses 



