Part 512 - Wetland Conservation 

 512.41(f) 



(f) Farmed wetland determinations may be changed to prior 

 converted cropland during the reconsideration or appeal process. In 

 those cases where a fanned wetland is changed to a prior converted 

 cropland, the following dociimentation, as applicable, will be included 

 in the case file for each farmed wetland designation that is changed: 



(1) The type of existing or original drainage system to 

 include size, spacing, depth, grade, and outlet conditions. 



(2) Surface inlets. 



(3) Drainage area to the pothole or playa. 



(4) Condition of present drainage system. 



(5) Crop history for the farmed wetland area. 



(6) How surface water is removed. 



(7) How saturation is removed, to include the bottom width 

 of the basin, location of the drainage system within the basin, and 

 the distance of the lateral effect of the drainage system. 



(8) Maps of the following: ' 

 (i) Drainage area to the basin 



(ii) The basin itself 



(iii) Location of drainage system 



(9) Soil type and related drainage information. 



(10) Based on the above docvimentation , if the drainage 

 system has removed the ponding and saturation to the point that the 

 area is not saturated or ponded for 7 days or more during the growing 

 season, the area is prior converted cropland. 



(g) Available data and maps from flood frequency studies, such as 

 flood insurance surveys, may be used to dociiment the seasonally 

 flooded condition for extended periods in the growing season (a 50 

 percent chance of occurrence). Depending on local conditions, normal 

 snowmelt volume may dominate. This may be a 2 year, 24 hour rxinoff 

 volume. (See Chapter 2 of the SCS Engineering Field Manual) . 



512-62 



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



