hydrology (PART III, paragraph 49) were present prior to site altera- 

 tion. If no indicators of wetland hydrology were found, the original 

 hydrology of the area was not wetland hydrology. If indicators of 

 wetland hydrology were found, record the appropriate indicators on DATA 

 FORM 3 and return either to the appropriate subsection of Section D or 

 to Section E and complete the wetland determination. 



Subsection A - Man-Induced Wetlands 



76. A man-induced wetland is an area that has developed at least some 

 characteristics of naturally occurring wetlands due to either intentional or 

 incidental human activities. Examples of man-induced wetlands include irri- 

 gated wetlands, wetlands resulting from impoundment (e.g. reservoir shore- 

 lines), wetlands resulting from filling of formerly deepwater habitats, 

 dredged material disposal areas, and wetlands resulting from stream channel 

 realignment. Some man-induced wetlands may be subject to Section 404. In 

 virtually all cases, man-induced wetlands involve a significant change in the 

 hydrologic regime, which may either increase or decrease the wetness of the 

 area. Although wetland indicators of all three parameters (i.e. vegetation, 

 soils, and hydrology) may be found in some man-induced wetlands, indicators of 

 hydric soils are usually absent. Hydric soils require long periods (hundreds 

 of years) for development of wetness characteristics, and most man-induced 

 wetlands have not been in existence for a sufficient period to allow develop- 

 ment of hydric soil characteristics. Therefore, application of the multi- 

 parameter approach in making wetland determinations in man-induced wetlands 

 must be based on the presence of hydrophytic vegetation and wetland hydrol- 

 ogy.* There must also be documented evidence that the wetland resulted from 

 human activities. Employ the following steps to determine whether an area 

 consists of wetlands resulting from human activities: 



• STEP 1 - Determine Whether the Area Represents a Potential 

 Man-Induced Wetland. Consider the following questions: 



a. Has a recent man-induced change in hydrology occurred that 

 caused the area to become significantly wetter? 



* Uplands that support hydrophytic vegetation due to agricultural irrigation 

 and that have an obvious hydrologic connection to other "waters of the 

 United States" should not be delineated as wetlands under this subsection. 



91 



