Erosion and Sediment Pollution Control Program Manual.pdf

SUPER SILT FENCE (SUPER FILTER FABRIC FENCE) - Sediment Removal Efficiency: LOW.
This device is not an ABACT for special protection watersheds. However, it may be used with
another BMP that is an ABACT (e.g. vegetated filter strip) to make it more effective. Super silt
fence may be used to control runoff from some small disturbed areas where the maximum slope
lengths for reinforced silt fence cannot be met and sufficient room for construction of sediment traps or
basins does not exist.
PA DEP
Only those fabric types specified for use as silt fence by the manufacturer should be used.
The maximum slope length — in both existing and final grade — above any super silt fence should not
exceed that shown in Table 4.4 or Figure 4.3. The slope length shown is the distance from the fence to
the drainage divide or the nearest upslope channel. NOTE: Slope length is not increased by use of
multiple rows of super silt fence.
Super silt fence should not be used in areas where rock or rocky soils prevent the full and uniform
anchoring of the fence or proper installation of the fence posts. It should be used only where access
exists or can be made for the construction equipment required to install and remove the chain link
fencing (e.g. trencher and posthole drill).
Super silt fence should be installed at level grade. Both ends of each fence section should be extended
at least 8 feet upslope at 45 degrees to the main fence alignment to allow for pooling of water (see
Figure 4.1).
Super silt fence should be installed according to the details shown in Standard Construction
Detail # 4-10.
An 8” deep trench should be excavated, minimizing the disturbance on the downslope side. The
bottom of the trench should be at level grade.
363-2134-008 / March 31, 2012 / Page 82