Wetland Delineations in Florida: A Critical Step in Land Development and Due Diligence
Updated: 5 days ago
When a developer, engineer, or land acquisition team calls us about a wetland delineation, they're usually trying to answer one question:
How much of this property is actually developable?
Wetlands affect site yield, density calculations, stormwater design, road alignments, permitting requirements, and project schedules. Before meaningful design work begins, somebody needs to determine where the regulatory constraints are located. That is the purpose of a wetland delineation.
Because wetlands are regulated by local governments, the Florida Environmental Resource Permitting program, and in certain circumstances federal agencies, properly identifying wetland and surface water boundaries is often one of the first and most important steps in project planning.
A wetland delineation helps developers, engineers, surveyors, and landowners understand environmental constraints before significant resources are invested in site design, permitting, or acquisition.
Why Developers Need Wetlands
Wetlands often become one of the primary constraints on a development site. The location and extent of wetlands can affect:
Buildable acreage
Residential density
Roadway alignments
Utility corridors
Stormwater systems
Environmental permitting requirements
Mitigation costs
Overall project feasibility
For that reason, a wetland delineation is often one of the first environmental due diligence tasks completed on a parcel. The earlier wetlands are identified, the less likely a project is to experience redesigns, permitting delays, or unpleasant surprises during agency review.
By The Way, What Is A Wetland?
Nearly all city or county planning departments in Florida require some form of wetland approval or environmental review as part of the land development or building permit process. Depending on the location and scope of development, other state agencies such as the Florida Department of Environmental Protection (FDEP) or one of the five Florida Water Management Districts, will also be involved and may have their own permitting requirements.
At the state level, a wetland is defined in Florida Statute 373.019, paragraph 27 as:
“those areas that are inundated or saturated by surface water or groundwater at a frequency and a duration sufficient to support, and under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soils. Soils present in wetlands generally are classified as hydric or alluvial, or possess characteristics that are associated with reducing soil conditions. The prevalent vegetation in wetlands generally consists of facultative or obligate hydrophytic macrophytes that are typically adapted to areas having soil conditions described above. These species, due to morphological, physiological, or reproductive adaptations, have the ability to grow, reproduce, or persist in aquatic environments or anaerobic soil conditions. Florida wetlands generally include swamps, marshes, bayheads, bogs, cypress domes and strands, sloughs, wet prairies, riverine swamps and marshes, hydric seepage slopes, tidal marshes, mangrove swamps and other similar areas. Florida wetlands generally do not include longleaf or slash pine flatwoods with an understory dominated by saw palmetto”.
Some wetlands are pretty obvious. A cypress dome surrounded by pine flatwoods isn't going to generate much debate. Other wetlands are far more subtle. A wet prairie wetland, a seasonal depression, a poorly drained flatwoods pocket, or a hydric transition zone may not appear wet at all during portions of the year. Yet those areas can still meet Florida's wetland definition. For developers, however, the critical question is usually not whether a wetland exists. The critical question is: Where is the boundary?
The Real Question: Where Does the Wetland End?
People often think that a wetland delineation is an exercise in identifying wetland communities. In reality, a wetland delineation is fundamentally a boundary determination.
Florida's methodology, found in Chapter 62-340, Florida Administrative Code, requires environmental scientists to evaluate vegetation, soils, and hydrologic indicators in the field and determine where wetland characteristics cease and upland characteristics begin. That line often becomes one of the most important design constraints on the property.
The difference between a wetland boundary located 20 feet one way versus 20 feet the other can affect lot counts, building footprints, stormwater systems, and permitting and wetland mitigation requirements.
Why Desktop Mapping Isn't Enough
There are plenty of free and publicly accessible resources for development teams starting their review, including:
While these are useful desk review resources, it's important to understand that most public datasets are derived from aerial interpretation, remote sensing, soils mapping, or historical information. Some are decades old. None of these resources would be considered an acceptable substitution for a wetland delineation by a regulatory agency. Many sites in Florida have unmapped wetlands. Other sites have been altered but still meet wetland criteria.
The Cost of Getting It Wrong
A wetland boundary that is too conservative can unnecessarily restrict development. A wetland boundary that excludes actual wetlands can create considerably larger problems.
If the wetland boundary is delineated too far upland:
Buildable acreage may be reduced
Site yield may be understated
Property value may be unnecessarily affected
If the delineated wetland boundary excludes wetlands:
Permitting complications may arise
Redesigns may be required
Agency enforcement actions become a possibility
Project schedules can be impacted
At Excelsior, our objective is not to maximize wetlands or minimize wetlands during a delineation, but to objectively and defensibly located the boundary.
How We Perform Wetland Delineations at Excelsior
Every wetland delineation begins in the office, long before we put on our snake boots and jump out of the trucks. We review aerial imagery, soil maps, topographic data, agency databases, and available permitting history and generate a GIS profile to develop an understanding of the site before stepping into the field.
Fieldwork typically includes:
Vegetative community evaluation
Hydric soil assessment
Documentation of hydrologic indicators
Wetland boundary flagging
Collection of field data using GNSS units
Should You Obtain a Formal Wetland Determination Afterwards?
For many development projects, the answer is "Yes". A consultant's delineation represents a professional opinion regarding the wetland boundary. A Formal Wetland Determination provides agency verification of that boundary.
The additional time and cost do not make sense for every project. They can, however, reduce uncertainty during:
Property acquisition
Entitlement
ERP permitting
Due diligence reviews
Financing
High-value land transactions
The larger the project and the greater the investment, the more valuable regulatory certainty tends to become. We discuss the Formal Wetland Determination in more detail in this blog post.
Timing Matters
One of the more expensive mistakes in land development is waiting too long to investigate environmental constraints. Wetland delineations are most valuable before:
Closing on a property
Completing conceptual site planning
Finalizing density calculations
Designing utilities
Designing stormwater systems
At that stage, the delineation informs the project, whereas later on, it often forces revisions or redesigns to the project.
The Bottom Line
We know that land owners and developers don't hire use because they need a lesson in ecology. They hire us because wetlands affect schedules, costs, density, and permitting. A wetland delineation identifies where those constraints are located before significant resources are committed to engineering, acquisition, or construction. Our goal is simple: establish an accurate, defensible boundary that allows informed development decisions to be made with confidence.
If you're evaluating a property in Florida, we can help determine what environmental constraints exist, where they're located, and what they mean for your project. Contact Excelsior Environmental Consulting Group at 855-720-2333 or contact@excelsiorflorida.com to discuss your site.
Updated 12 November 2023
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