Subpart B - Wetland Criteria 



512.11(h) (4) (i) 



(i) Consociations are soil map units named for a 

 single kind of soil (taxon) or miscellaneous area. Seventy five 

 percent of the area is similar to the taxon for which the unit is 

 named. When named for a hydric soil, the soil map unit is 

 considered a hydric soil map unit for wetland determinations. 

 However, small areas within these map xinits may not be hydric and 

 should be avoided when determining prevalence of hydrophytic 

 vegetation. 



(ii) Complexes and associations are soil map units 

 named for two or more kinds of soils (taxa) or miscellaneous areas. 

 If all taxa for which a complex or association is neuned are hydric, 

 the soil map unit may be considered a hydric soil map unit for 

 wetland determinations. If only part of the map unit is made up of 

 hydric soils, only those portions of the map unit delineation that 

 are hydric soil are considered in wetland determinations. 

 Prevalence of hydrophytic vegetation is completed on only the areas 

 of hydric soils within the delineation, and only those portions of 

 the area that meet wetlzmd criteria are shown on the ASCS aerial 

 photocopy as wetland. , . .. ■ ... 



(iii) Undifferentiated groups are soil map units 

 named for two or more kinds of soil (taxa) or miscellaneous areas. 

 Undifferentiated groups do not have a regular pattern of occurrence 

 of the soils for which the group is named. If all components are 

 hydric soil, the map unit may be considered a hydric soil map unit. 

 If one or more of the soils for which the map unit is named are 

 nonhydric, each delineation must be evaluated for presence of 

 hydric soil. 



(h) Elements of the covmty hydric soil map unit list. 



(1) The soil map unit symbol and name; 



(2) The name of the hydric soil part or parts of the 

 soil map unit and information on whether the hydric soil composes 

 all, a part, or a minor inclusion of the soil map unit; and 



(3) Probable landscape position of hydric soils within 

 the soil map delineation if only part of the map unit is hydric 

 soil. 



(4) Additional items to be added to the list are those 

 areas of hydric soil map units that: 



512-11 

 (180-V-NFSAM, Second Ed., Amend. 6, May 1991) 



