What is the function of a silt fence?

A silt fence serves a vital role in sediment control by filtering sediment from runoff while allowing water to pass through. When installed correctly, the silt fence is designed to intercept runoff water, which contains suspended soil particles. As water flows through the fabric of the fence, larger sediment particles settle out before they can be carried away to downstream areas, such as rivers, lakes, or wetlands. This process helps to reduce the amount of sediment that enters these water bodies, which can be detrimental to aquatic ecosystems.

In addition to sediment control, the permeability of the silt fence allows clean water to continue draining, thereby preventing the buildup of water on one side of the fence. This balance is crucial during rainfall events, as it mitigates the risk of flooding or water pooling in construction areas. The effectiveness of a silt fence can significantly contribute to erosion control practices, promoting better site management and environmental protection.