A silt fence is a temporary sediment control device used on construction sites to protect water quality in nearby streams, rivers, and lakes from sediment in stormwater runoff. It is typically made of a synthetic geotextile fabric that is stretched between wooden or metal posts driven into the ground. The primary function of this barrier is not to filter the water, but rather to pond the muddy water, causing the suspended soil particles to settle out of suspension due to gravity. By slowing down the velocity of the runoff, the structure allows the heavy sediment to drop to the ground before the water exits the site. This simple yet highly effective mechanism ensures that nearby drainage systems and natural waterways remain free from excessive siltation, which can disrupt aquatic ecosystems and cause severe environmental damage.
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