National Wetlands Inventory Habitat Modifiers - Water Regime, Water Chemistry, Soil, Special: 

                                   MODIFIERS

                                  |_ A=Temporarily Flooded
                                  |_ B=Saturated                      
                                  |_ C=Seasonally Flooded
                                  |_ D=Seasonally Flooded/Well Drained
                                  |_ E=Seasonally Flooded/Saturated 
                                  |_ F=Semipermanently Flooded
                |__Non-Tidal______|_ G=Intermittently Exposed
                |                 |_ H=Permanently Flooded
                |                 |_ J=Intermittently Flooded
                |                 |_ K=Artificially Flooded 
                |                 |_ W=Intermittently Flooded/Temporary (used on older maps)
                |                 |_ Y=Saturated/Semipermanent/Seasonal (used on older maps) 
                |                 |_ Z=Intermittently Exposed/Permanent (used on older maps)
                |                 |_ U=Unknown
                |                
                |                
                |                
WATER REGIME____|                
                |                 
                |                  
                |                    
                |                 
                |                 |_ K=Artificially Flooded
                |                 |_ L=Subtidal   
                |                 |_ M=Irregularly Exposed  
                |                 |_ N=Regularly Flooded 
                |__Tidal__________|_ P=Irregularly Flooded
                                  |_*S=Temporary-Tidal   
                                  |_*R=Seasonal-Tidal
                                  |_*T=Semipermanent-Tidal
                                  |_*V=Permanent-Tidal
                                  |_ U=Unknown
                                  | 
                                  |_*These water regimes are only used in 
                                  |  tidally influenced, freshwater systems.

                                  

                                  |_ 1=Hyperhaline
                                  |_ 2=Euhaline
                |__Coastal        |_ 3=Mixohaline (Brackish)
                |  Halinity_______|_ 4_Polyhaline
                |                 |_ 5=Mesohaline
                |                 |_ 6=Oligohaline
                |                 |_ 0=Fresh
                |
                |
                |
WATER CHEMISTRY_|
                |                 |_ 7=Hypersaline
                |__Inland         |_ 8=Eusaline
                |  Salinity_______|_ 9=Mixosaline
                |                 |_ 0=Fresh
                |
                | 
                |
                |
                |__pH Modifiers   |_ a=Acid
                   for all        |_ t=Circumneutral
                   Fresh Water____|_ i=Alkaline




SOIL______________________________|_ g=Organic
                                  |_ n=Mineral




                                  |_ b=Beaver
                                  |_ d=Partially Drained/Ditched
SPECIAL MODIFIERS_________________|_ f=Farmed
                                  |_ h=Diked/Impounded
                                  |_ r=Artificial Substrate
                                  |_ s=Spoil
                                  |_ x=Excavated

U = Uplands