Wetland delineation requires expert knowledge of wetland vegetation, hydric soils, and wetland hydrology. Many variables must be considered and field experience is essential to ensure that the most accurate and appropriate boundary is established.

All WRA wetlands delineation staff have received certified training for, and some have taught classes on, the U.S. Army Corps of Engineers (COE) standard methodology. Jurisdictional delineations prepared by WRA have been uniformly accepted by federal agencies without costly re-investigation. WRA staff have often provided third party expertise in settling wetland jurisdictional disputes. The firm relies on the latest scientific techniques and approaches to provide its clients with the best methodologies possible, including Global Positioning System (GPS) equipment with sub-meter accuracy.

WRA has conducted wetland delineations and assessments in a variety of wetland habitat types, including tidal salt and freshwater wetlands, non-tidal seasonal wetlands, riparian woodlands, vernal pools, freshwater marshes, mountain meadows, bottomland hardwoods, seasonal forested wetlands, man-made wetlands, and ponds.