Wetland Delineation

A wetland delineation is a mapped line of the boundary between wetland and nonwetland portions of a site.  Wetlands are defined under the US Clean Water Act in Section 404 and are regulated under Federal law, generally with additional State laws and regulations.  The delineation process includes:

  1. Determination and documentation of wetland and nonwetland status for applicable areas of the site
  2. Flagging the boundary line between wetland and nonwetland areas in the field
  3. Using GPS (generally submeter or sub-decimeter accuracy) to locate the flag locations and determination points
  4. Mapping the site by overlaying the field-collected GPS points on a base map and using those points to draw areas for the wetland and nonwetland site components
  5. Calculating wetland and nonwetland acreages for the site
  6. Describing the results of the field study in a report, set of maps and field data forms
  7. Optional but typical: Submittal of the report to the US Army Corps of Engineers for verification and a formal finding of jurisdiction under the Clean Water Act, called a ‘Jurisdictional Determination’ or JD

Other ecological studies and permitting services are often combined with wetland delineations.

Wetland Delineation Experience

Cypress has extensive experience with wetland delineations and jurisdictional determinations in US Army Corps of Engineers Districts throughout the United States.  Our staff have performed hundreds of wetland delineations and wetland mapping studies up to 110,000 acres in size and hundreds of miles in length for linear projects, including projects for real estate developers, railways, transportation authorities, State/ Federal/ municipal governments, individual homeowners, civil engineering firms, construction firms and nonprofit organizations.

Representative Projects

Texas Flat Mitigation Bank: 1985-acre wetland delineation (also endangered species survey, wetland function assessments, stream assessments, permitting, restoration planning)

Private Client: 200-mile linear delineation for utility corridor Mobile, AL to Jackson, MS (also endangered species survey, stream characterization, environmental assessment, permitting)

Turtleskin Creek Mitigation Bank: 2740-acre wetland delineation (also endangered species survey, wetland function assessments, stream assessments, permitting, restoration planning)

Delineation Project Photos

Wetland delineation field crew
Wetland delineation map