Silt Fence Design Considerations

Silt Fence Design Considerations

Design Considerations:

Silt fences have a useful life of one season.  Their principal mode of action is to slow and pond the water and allow soil particles to settle.  Silt fences are not designed to withstand high heads of water, and therefore should be located where only shallow pools can form.  Their use is limited to situations in which sheet or overland flows are expected.  Install silt fences with smiles.

The slicing method has the capability to turn in a short distance, thus properly installing silt fence where needed.  Turning enables upturns on the ends of silt fence runs, maneuvering around obstacles on construction sites, protection along property lines, and following contours.

Silt fences normally cannot filter the volumes generated by channel flows. When installed across a concentrated flow path, undercutting of the fence often occurs.  Silt fences should not be designed to impound sediment or water more than 18 inches (0.5 m) high.  Sediment shall be cleaned from behind the fence when it reaches 50% of the designed impoundment height (9 inch (0.2 m)).

Some design considerations include:

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