Its primary purpose is to protect nearby water bodies, such as streams, rivers, lakes, or ponds, from pollution caused by sediment-laden runoff generated during construction activities. Here are the main purposes of a silt fence in construction:

Erosion Control

Silt fences are deployed along the perimeter of construction sites or along slopes to control soil erosion. They help to trap sediment particles carried by stormwater runoff, preventing them from being washed away and deposited into adjacent water bodies.

Sediment Control

One of the primary functions of a silt fence is to control sediment migration. By acting as a barrier, the silt fence intercepts sediment-laden runoff, allowing water to pass through while retaining sediment particles behind the fence. This helps to reduce the amount of sediment reaching sensitive areas downstream.

Compliance with Regulations

Many construction projects are subject to environmental regulations that require sediment and erosion control measures to be implemented to protect water quality. Silt fences are often a mandated requirement by regulatory agencies as part of erosion and sediment control plans.

Protection of Water Quality

Sediment runoff from construction sites can carry pollutants such as sediment, silt, debris, chemicals, and other contaminants. By containing sediment on-site, silt fences help to prevent these pollutants from entering water bodies, thus preserving water quality and aquatic habitats.

Site Stabilization

Silt fences also contribute to site stabilization by reducing the velocity of stormwater runoff and promoting sediment settlement. This helps to minimize soil loss, maintain ground stability, and prevent land degradation during construction activities.

Cost-Effective Solution

Silt fences are relatively inexpensive and easy to install compared to other erosion and sediment control measures. They provide a cost-effective solution for construction sites to comply with regulatory requirements and minimize environmental impacts.

Overall, the purpose of a silt fence in construction is to mitigate the environmental impact of sediment runoff and soil erosion by controlling sediment migration, protecting water quality, and promoting site stabilization. Proper installation, maintenance, and monitoring of silt fences are essential to ensure their effectiveness in controlling sediment and erosion on construction sites.