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Silt fence is a temporary barrier solution allowing water to pool creating a low energy condition. Sediment will be retained behind the fence preventing it from being deposited in water bodies or storm sewers. The silt fence is composed of a filter fabric entrenched in the soil and secured to a series of posts for support. While this solution is used as a preventative measure against excessive sediment loss, it is designed as a temporary barrier and is not effective as a long-term sediment control solution.
KEYMAY’s silt fence solutions are constructed from a lightweight, woven geotextile material. With proper design and installation practices, silt fence maximum sediment retention prior to maintenance will be 200mm or of the height of the fence.
When installing a silt fence in a trench, the geotextile material is installed in a ‘J’ shape at least 150 mm (6 inches) below the ground, following the contours of the site for effective protection from water flow. The trench is then backfilled and compacted over the installed geotextile until the trench is completely filled with compacted soil.
Another method of silt fence installation is through soil slicing. With soil slicing silt fence construction, the geotextile material is inserted into a slit in the soil, about 0.2 to 0.3 m (8 to 12in.) deep. The silt fence is installed deep enough so that no water flow will pass under the material, while allowing effective disruption to the soil above the silt fence structure in order to create an optimal soil condition for mechanical compaction upon completion.