The Filter Point style is characterized
by the deep cobbled surface. This style exhibits a relatively high
coefficient of hydraulic friction and is well suited to attenuation
of hydraulic energy. The filter points are created by weaving the
top and bottom layers of fabric together. These filter points relieve
hydrostatic uplift from ground water in the underlying soil. Filter
point sizes are classified by measuring the diagonal distance between
two filter points. The Filter Point style can also be easily vegetated
by installing live stakes through the filter points.
5" Filter Point
The lightest in the Filter Point style,
the 5" FP, is used for constructing thinner revetments in less
demanding areas.
8" Filter Point
The most common size in the Filter
Point style, the 8" FP, is used where hydrostatic uplift and
weight are needed to protect an area.
10" Filter Point
The largest in the Filter Point style,
the 10" FP is used where severe abrasion is anticipated and
additional weight is advised.
Some areas of installation include:
drainage ditches, down drains & perimeter ditches on landfills,
canals, ponds, lakes & reservoirs, headwalls & pipe outlets,
and spillways & dams.
