When people think about erosion control, the main focus is often on the physical Best Management Practices (BMPs) installed throughout a construction site. Silt fence, inlet protection, wattles, and vehicle tracking controls are all examples of erosion or sediment control measures. However, before any of those controls are installed, there is typically a plan that guides where they go and how they work together: the Erosion Control (EC) Plan.
An Erosion Control Plan (EC Plan) serves as the visual roadmap for managing stormwater throughout a construction project. It helps contractors, inspectors, and project managers understand how runoff will move across the site and where stormwater controls should be installed to prevent erosion and sediment from leaving the project boundaries.
What Is an Erosion Control Plan?
An Erosion Control Plan is a site map that’s a part of the Stormwater Management Plan (SWMP). It illustrates the stormwater management strategy for a construction project. It identifies existing site conditions, drainage patterns/flow arrows, and the locations of temporary and permanent BMPs that will be used to control erosion, sediment, and runoff.
What Information Is Included?
While every project is different, most Erosion Control Plans contain several key elements:
Site Boundaries
The plan identifies the limits of disturbance and the boundaries of the construction site. This helps project teams understand where stormwater controls are needed to prevent offsite impacts.
Drainage Patterns
One of the most important aspects of an EC Plan is showing how water flows across the site. Understanding drainage patterns helps determine where runoff may concentrate and where BMPs should be installed.
Best Management Practices (BMPs)
The plan identifies the locations of erosion control measures, including:
- Silt fence
- Inlet protection
- Straw or wood chip wattles
- Vehicle tracking controls
- Sediment traps or basins
- Check dams
- Stabilization areas
By mapping these controls, project teams can ensure BMPs are installed in the correct locations and functioning as intended.
Sensitive Areas and Receiving Waters
Many EC Plans also identify nearby waterways, drainage channels, wetlands, or other environmentally sensitive areas that require protection during construction.
The Relationship Between the EC Plan and the SWMP
The Erosion Control Plan is an important component of the Stormwater Management Plan (SWMP).
While the SWMP contains written procedures, inspection requirements, maintenance practices, and compliance documentation, the EC Plan provides the visual representation of those controls in the field and should be updated consistently to reflect site conditions.
Together, the SWMP and EC Plan create a complete stormwater management strategy. The SWMP explains what needs to happen, while the EC Plan shows where it happens.
Why Updates Matter
Construction sites are constantly changing. New grading activities, utility installations, building construction, and stabilization efforts can all affect how stormwater moves across a site.
As these changes occur, the Erosion Control Plan should be updated to reflect current conditions. An outdated EC Plan may no longer accurately represent BMP locations, drainage patterns, or disturbed areas.
Keeping the plan current helps ensure that inspections, maintenance activities, and compliance efforts remain aligned with actual site conditions.
Final Thoughts
An Erosion Control Plan is much more than a drawing included in a permit package. It serves as the roadmap for stormwater compliance, helping project teams understand how runoff will be managed and where controls should be installed throughout construction.
When paired with an up-to-date SWMP and routine inspections, the EC Plan becomes a valuable tool for protecting water quality, reducing erosion risks, and maintaining compliance.
At Summit Services Group, we help clients develop, maintain, and update stormwater documentation to keep projects compliant from groundbreaking through final stabilization.