Perimeter control is one of the most critical aspects of any effective stormwater pollution prevention plan, and a silt fence is the most common tool used for this specific purpose. When placed at the downslope perimeter of a construction zone, it acts as a final line of defense before runoff leaves the property. The fabric structure allows water to pass through at a highly controlled, slow rate, which effectively pools the water on the upstream side. This ponding effect is crucial because it significantly reduces the kinetic energy of the moving stormwater, causing the displaced topsoil and larger sediment grains to drop to the ground before the water discharges off-site.
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