Proper placement of a silt fence is critical for its effectiveness in managing construction site runoff. It should be installed down-slope from disturbed areas where erosion is likely to occur, perpendicular to the direction of the water flow. It is important to place the barrier on a level contour so that water pools evenly along its length rather than concentrating in low points, which can cause breaches. This positioning ensures that the silt fence can intercept sheet flow runoff before it leaves the property or enters drainage ditches.
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