During periods of intense precipitation, a silt fence acts as a ponding mechanism rather than a simple filter. While the fabric does have small openings, the primary way a silt fence works during heavy rain is by creating a pool behind the barrier. This pooling effect significantly reduces the velocity of the runoff, which is crucial because slower water has less energy to carry heavy sediment. As the water sits behind the silt fence, gravity pulls the dirt and debris to the ground. It is important to monitor these barriers during storms to ensure they do not collapse under the weight of the accumulated water and mud. A well maintained silt fence provides a reliable line of defense against erosion and prevents hazardous silt from entering local drainage systems or sensitive natural habitats.
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