Filter Point Mat

Filter Point Mat (FPM) is an erosion resistant, permeable concrete lining formed with a double-layer woven fabric, joined together by interwoven, filter points (drains). Once pumped, the cobbled surface and relatively high coefficient of friction act to reduce velocity and wave run-up. The filter points provide for the relief of hydrostatic uplift pressure, increasing the system’s stability.

Filter Point Mat (FPM) form a lining of average thickness and specified weight to provide strength and erosion protection to resist the calculated tractive forces. The design criterion for selection of lining thickness is the same as that used to determine the thickness of conventional concrete slope paving. FPM is custom fabricated into multiple mill width panels, designed to fit actual site dimensions and topography.


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 engineered slopes

TECHNICAL DATA

FILTER POINT MAT (FPM)
STYLE SPACING AVERAGE THICKNESS UNIT WEIGHT CONCRETE COVERAGE
5” FPM 5” 2.2” 26 lbs./ft² 115 sq. ft./cy
8” FPM 8” 4.0” 47 lbs./ft² 73 sq. ft./cy
10” FPM 10” 6.0” 70 lbs./ft² 49 sq. ft./cy

APPLICATIONS

  • Bridge Abutments
  • Storm Sewer Outfalls
  • Channel Lining
  • Pond Lining
  • Shoreline Revetments
  • Spillway/Weir Structures
  • Embankments

INDUSTRIES

  • Highways/Bridges
  • Ports/Harbors
  • Dams/Levees
  • Rivers/Canals
  • Flood Control
  • Coastal/Marine
  • Industrial Waste Landfill
  • Mining
  • Oil/Gas Pipeline
  • Power Generation

MATERIAL PROPERTY – ARMORFORM FABRICS
PROPERTY TEST UNITS VALUE
PHYSICAL
Composition of Yarns - - Polyester
Mass Per Unit Area (Double-Layer) ASTM D 5261 oz/yd² 14
Thickness (Single-Layer) ASTM D 5199 mils 27
Mill Width (Woven) inch 72
MECHANICAL
Wide-Width Strip Tensile Strength - WARP | FILL ASTM D 4595 lbs./inch 340/270
Elongation at Break - WARP | FILL - Max. ASTM D 4595 % 12/12
Trapezoidal Tear Strength - WARP | FILL ASTM D 4533 lbs. 180/170
Grab Tensile Strength ASTM D4632 lbf 364/310
Grab Tensile Elongation ASTM D4632 % 25/21
CBR Puncture Strength ASTM D 6241 lbs. 1575
HYDRAULIC
Apparent Opening Size (AOS)3 ASTM D 4751 U.S. Standard (mm) 20
Flow Rate ASTM D 4491 gal/min/ft² 125

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