A silt fence serves as a temporary sediment barrier designed to protect water quality in nearby streams, rivers, and lakes from sediment-laden stormwater runoff. Typically constructed of a synthetic filter fabric, usually a woven polypropylene geotextile, this barrier is stretched between wooden or steel stakes along the contours of a construction site. When properly installed, it intercepts sheet-flow runoff, ponds the muddy water, and allows the suspended soil particles to settle out of suspension through sedimentation rather than acting as a tight literal filter. By slowing down the velocity of the runoff, it ensures that heavy sediments remain contained within the boundaries of the disturbed site instead of washing away into local municipal storm drains or natural aquatic habitats.
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