A Guide to Inlet Protection Barriers: Types, Installation, and Maintenance
- joeyruse
- Feb 12
- 3 min read
Updated: Mar 7
Inlet protection barriers are vital components of stormwater management systems on construction sites. These barriers prevent sediment and debris from entering storm drains, helping to protect downstream water quality and comply with regulatory requirements. This article explores the different types of inlet protection barriers, their installation methods, and the maintenance practices necessary for each type.
Types of Inlet Protection Barriers
1. Silt Fence Barriers
Description: Made from geotextile fabric, silt fence is installed around storm drain inlets to filter sediment from stormwater.
Best Use: Ideal for inlets in areas with high sediment loads and shallow slopes.
2. Gravel and Stone Bags
Description: Gravel- or stone-filled bags are placed around the perimeter and mouth of an inlet to slow water flow and trap sediment.
Best Use: Effective for inlets with low to moderate water flow.
3. Prefabricated Inlet Protection Devices
Description: Manufactured devices made from durable materials like synthetic fibers or metal mesh. These devices are placed directly over or inside the inlet.
Best Use: Suitable for high-traffic areas due to their durability and ease of installation.
Image from AFC West Inc Geosynthetics
4. Wattles and Logs
Description: Cylindrical barriers made from straw, coconut fibers, or synthetic materials. These are installed around the intake of inlets to filter sediment.
Best Use: Effective for small inlets and areas with moderate flow rates.
5. Curb Inlet Barriers
Description: Specially designed barriers that fit along curb inlets to trap sediment while allowing water to flow into the drain.
Best Use: Used along roadways and urban areas with curb drains.
Image from: UltraTech International, Inc
Installation Methods
Silt Fence Barriers
Excavate a shallow trench (4-6 inches deep) around the storm drain.
Secure the silt fence in the trench, ensuring the bottom edge is buried.
Backfill the trench and compact the soil to hold the fence in place.
Ensure the fence surrounds the inlet completely and is taut.
Gravel and Stone Bags
Place filled bags in a horseshoe or ring shape around the storm drain intake.
Stack bags if additional height is needed for increased flow capacity.
Ensure gaps between bags are minimized to prevent water bypass.
Prefabricated Devices
Select a device suitable for the inlet type and dimensions.
Follow the manufacturer’s instructions to place the device securely over or inside the inlet.
Ensure a snug fit to prevent water bypass around the edges.
Wattles and Logs
Position wattles or logs in a circle or horseshoe shape around the inlet mouth.
Secure with stakes driven through the wattle and into the ground where possible.
If staking is not possible, consider using a different type of wattle such as one composed of recycled rubber. Such wattles are typically heavier and less likely to be moved or carried away by stormwater runoff.
Ensure the barriers are tight against the surface to prevent underflow.
Curb Inlet Barriers
Position the barrier along the curb inlet, ensuring it covers the entire opening.
Secure the barrier using weights or anchors as per the manufacturer’s guidelines.
Adjust as needed to maintain proper placement during use.
Maintenance Requirements
General Guidelines
Inspect Frequently: Check all inlet protection barriers weekly and after significant rainfall events.
Remove Sediment: Clean out accumulated sediment before it reaches one-third of the barrier’s height or capacity.
Repair Damage: Address any rips, tears, or displacements immediately to ensure effectiveness.
Specific Maintenance Tips
Silt Fence Barriers
Ensure the fabric is securely buried and not sagging.
Replace torn or clogged sections promptly.
Gravel and Stone Bags
Reposition displaced bags and replace damaged ones.
Ensure bags remain tightly packed and gaps are minimized.
Prefabricated Devices
Clean out sediment and debris trapped by the device.
Follow manufacturer’s instructions for replacement parts or repairs.
Wattles and Logs
Replace broken or deteriorating wattles.
Re-stake or reposition as needed to maintain a tight fit.
Curb Inlet Barriers
Check for proper placement and secure anchoring.
Remove debris or sediment blocking the barrier.
Final Thoughts
Proper installation and maintenance of inlet protection barriers are critical for managing sediment on construction sites and protecting water quality. By selecting the appropriate barrier type, following installation guidelines, and conducting regular maintenance, construction operators can ensure compliance with stormwater regulations and avoid costly fines or environmental damage.
Not sure what erosion and sediment controls you need on your construction site?
Contact the Certified Professionals in Erosion & Sediment Control (CPESC) at Eco Permit Pros today to get started on your plan!
Comments