Part 512 - Wetland Conservation 



512.11(h) (i) 



(i) Contain hydric soils that are hydric only 

 because of saturation (Section 512.11(b)). These soils are hydric 

 due to water taJales at or near the surface. 



(ii) Support woody vegetation under natural 

 conditions. (These areas will be considered prior converted 

 croplands if an agricultural commodity has been produced prior to 

 December 23, 1985, and these areas are not potholes, playas, or 

 seasonally flooded or ponded.) 



(iii) Contain potholes or playas. (These areas 

 will be considered wetlands regardless of cropping history if they 

 meet wetland criteria.) 



(iv) Are seasonally flooded or ponded. 

 (Information other than soil survey data may need to be used to 

 help make this determination. These areas will be considered 

 wetlands if they meet wetland criteria.) 



(v) Can be farmed under natural conditions without 

 removing woody vegetation or other manipulation. 



(i) Preparation of lists of hvd ric soil map units . 



(1) Initial lists of hydric soil map units for a soil 

 survey area may be computer generated at the Iowa State University 

 Computer Center using the "HYDSUR" job control language. This 

 initial list will include all soil map units in the survey area 

 that are named by hydric soils. To ensure that this list is 

 current, the state must have an updated Map Unit Use File for the 

 survey area (see National Soils Handbook 603.12(d)). 



(2) Lists of hydric soil map units may be manually prepared by 

 comparing all soil map unit neunes and names of included soils 

 against Hvdric Soils of th e United states . 



(3) Include additional soil map units on the initial 

 list if they: 



(i) contain inclusions of hydric soils or wet 

 miscellaneous areas. 



(ii) are named for higher categories in "Soil 

 Taxonomy" that meet hydric soil criteria. (Exaunples include 

 "Aquents, flooded," or "Haplaquolls, ponded.") 



r 



512-12 



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



