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BMP C233: Silt Fence <br />Purpose <br />Silt fence reduces the transport of coarse sediment from a construction site by providing a temporary <br />physical barrier to sediment and reducing the runoff velocities of overland flow. <br />Conditions of Use <br />Silt fence may be used downslope of all disturbed areas. <br />Silt fence shall prevent sediment carried by runoff from going beneath, through, or over the <br />top of the silt fence, but shall allow the water to pass through the fence. <br />Silt fence is not intended to treat concentrated flows, nor is it intended to treat substantial <br />amounts of overland flow. Convey any concentrated flows through the drainage system to a <br />sediment trapping BMP. <br />Do not construct silt fences in streams or use in V-shaped ditches. Silt fences do not provide <br />an adequate method of silt control for anything deeper than sheet or overland flow. <br />2019 Stormwater Management Manual for Western Washington <br />Volume 11 - Chapter 3 - Page 370 <br />