Why is it important to check a silt fence for sagging or collapse?

Checking a silt fence for sagging or collapse is crucial primarily to prevent runoff erosion beneath the fence. Silt fences are designed to intercept sediment-laden water, allowing sediment to settle while letting cleaner water pass through. If a silt fence is sagging or has collapsed, it may not function effectively, allowing sediment-laden water to flow underneath or around the fence, which can lead to erosion in the surrounding area. This undermines the very purpose of the silt fence, which is to control erosion and manage sediment during construction activities or land disturbances. Maintaining the fence in proper condition ensures that it can fulfill its role in sediment control and protect the adjacent environment from potentially harmful runoff.