Wetlands can have a significant impact on how a property can be developed or used. Before beginning construction, land development, utility installation, or other projects that disturb the ground, it may be necessary to determine whether wetlands are present on the site.
A wetland delineation helps identify and map potential wetland areas so property owners, developers, engineers, and contractors can better understand environmental considerations before moving forward with a project.
What Is a Wetland Delineation?
Wetland delineation is the process of evaluating a property to determine whether wetlands are present and, if so, identifying their boundaries.
Wetlands aren’t always obvious. While some contain standing water or wetland vegetation, others may appear relatively dry during certain times of the year. This is why a professional field evaluation is often necessary.
A wetland delineation generally evaluates three primary characteristics:
- Vegetation: The presence of plants commonly associated with wet environments.
- Soils: Soil characteristics that indicate prolonged saturation or wet conditions.
- Hydrology: Evidence that water is present at or near the surface for sufficient periods.
These observations help determine where potential wetlands begin and end.
Why Are Wetlands Important to Development?
Wetlands provide important environmental functions, including storing floodwater, improving water quality, controlling erosion, and providing wildlife habitat.
Because of these functions, certain wetlands and waterways may be regulated by federal, state, or local agencies. Development activities that affect regulated wetlands may require permits or additional environmental review.
Identifying wetlands early allows a project team to incorporate them into site planning rather than discovering potential restrictions after engineering or construction has already begun.
When Does a Property Need a Wetland Delineation?
A wetland delineation may be recommended when a property contains low-lying areas, drainage features, streams, ponds, frequently saturated soil, or vegetation associated with wet conditions.
It may also be needed when planning projects such as:
- Commercial or residential developments
- Roads and infrastructure improvements
- Utility installations
- Industrial developments
- Agricultural improvements
- Grading or excavation
- Drainage improvements
- Land purchases involving undeveloped property
Even if a property does not appear to contain wetlands, an evaluation may be worthwhile when environmental conditions or regulatory requirements are uncertain.
Why Conduct Wetland Delineation Early?
Waiting until construction is underway to address wetlands can result in unexpected delays and additional costs.
Conducting a wetland delineation during the early planning stages can help developers and property owners understand site constraints before making major design decisions.
With this information, engineers may be able to adjust building locations, roads, utilities, detention areas, or other improvements to minimize potential wetland impacts.
Early identification can also provide additional time to address permitting requirements when impacts cannot be avoided.
What Happens During a Wetland Delineation?
The process typically begins with a review of available information about the property, which may include maps, soil information, aerial imagery, and other environmental data.
Environmental professionals then perform a field investigation to evaluate vegetation, soil conditions, hydrology, and other site characteristics.
When potential wetlands are identified, their boundaries can be marked in the field and documented for mapping and project planning purposes. Depending on the project and regulatory requirements, additional coordination with the appropriate agencies may also be necessary.
Wetland Delineation for Property Development
Wetlands do not necessarily mean that a property cannot be developed. However, knowing their location can be critical to designing a project appropriately and determining whether additional regulatory review or permitting may be required.
For developers, engineers, municipalities, contractors, and property owners, identifying environmental constraints early can help reduce uncertainty and keep a project moving forward.
Wetland Delineation Services in Southern Illinois and the St. Louis Metro Area
Quality Testing and Engineering (QTE) provides environmental testing and consulting services to support construction and development projects throughout Southern Illinois and the St. Louis metropolitan area.
Our team can evaluate site conditions, identify potential wetland areas, and provide the information needed to help property owners and project teams make informed decisions before development begins.
Planning a project and unsure whether wetlands could affect your property? Contact QTE to discuss wetland delineation and environmental consulting services for your site.