The current Federal delineation manual, dated January 1987, used in the Clean Water Act Section 404 regulatory program for the identification and delineation of wetlands. Except where noted in the manual, the approach requires positive evidence of hydrophytic vegetation, hydric soils, and wetland hydrology for a determination that an area is a wetland.
Portions of the manual have been superseded by regional guidance issued by each USACE district.
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