Erosion Control Technology Council standard specifications for permanent turf reinforcement mats Erosion Control Technology Council standard specifications for permanent turf reinforcement mats

Erosion Control Technology Council standard specifications for permanent turf reinforcement mats
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Type1	Product Description	Material Composition	Minimum Tensile Strength2,3	Minimum Thickness (ASTM D 6525)	UV Stability (ASTM D 4355 @ 500 Hours)	Channel Applications Permissible Shear Stress4, 5
5.A	Turf Reinforcement Mat	Long term, non-degradable rolled erosion control product composed of UV stabilized, non-degradable, synthetic fibers, filaments, nettings and/or wire mesh processed into three dimensional reinforcement matrices designed for permanent and critical hydraulic applications where design discharges exert velocities and shear stresses that exceed the limits of mature, natural vegetation. Turf reinforcement mats provide sufficient thickness, strength and void space to permit soil filling and/or retention and the development of vegetation within the matrix.	125 lbs/ft (1.82 kN/m)	0.25 inches (6.35 mm)	80%	= 6.0 lbs/ft2 (288 Pa)
5.B	Turf Reinforcement Mat		150 lbs/ft (2.19 kN/m)	0.25 inches (6.35 mm)	80%	= 8.0 lbs/ft2 (384 Pa)
5.C	Turf Reinforcement Mat		175 lbs/ft (2.55 kN/m)	0.25 inches (6.35 mm)	80%	= 10.0 lbs/ft2 (480 Pa)

¹For applications in channels and on slopes not exceeding 0.5:1 (H:V) where vegetation alone will not sustain expected flow conditions and/or provide sufficient long-term erosion protection. For TRMs containing degradable components, all property values must be obtained on the non-degradable portion of the matting alone.
²Minimum Average Roll Values, machine direction only for tensile strength determination using ASTM D6818 (Supersedes Mod. ASTM D5035 for RECPs)
³Field conditions with high loading and/or high survivability requirements may warrant the use of a TRM with a tensile strength of 44 kN/m (3,000 lb/ft) or greater.
⁴Shear stress that fully vegetated TRM can sustain without physical damage or excess erosion > 12.7 mm (0.5 in.) soil loss] during a 30-minute flow event in large scale testing.
⁵Acceptable large-scale testing protocol may include ASTM D6460 or other independent testing deemed acceptable by the engineer.