Filter Point Mat (FPM)

Filter Point Mat (FPM) fabric forms are constructed with spaced interwoven filter points to form a lining of required average thickness, deeply cobbled surface and specified weight to provide strength and erosion protection. The design criterion for selection of lining thickness is the same as that used to determine the thickness of conventional concrete slope paving. Relief of hydrostatic uplift pressure, caused by entrapped and ground water, is provided by the woven filter points which are on 5”, 8” or 10” centers. Filter Point Mat (FPM) is custom fabricated into multiple mill width panels, designed to fit actual site dimensions and topography.

Filter Point Mat used to line a drainage ditch.

Filter Point Mat being pumped.

DESIGN CONSIDERATIONS

 

FPM is used where velocities are low, bedload and ice formations are light and a roughness coefficient of N= 0.025 to 0.030 is acceptable.

 

FPM is used where wave action is light.

 

FPM is ideal for underwater placement.

 

FPM should be installed on well compacted soil conditions only.

FILTER POINT MAT (FPM)

FPM size

Filter Point

Spacing

Average

Thickness

Weight/

sq. ft.

Coverage/

cu. yard of

Concrete

5" FPM

5"

2.2"

26 lbs.

115 sq. ft.

8" FPM

8"

4.0"

47 lbs.

73 sq. ft.

10" FPM

10"

6.0"

70 lbs.

49 sq. ft.