Erosion Control Technology Council standard specifications for erosion control blankets and mulch control nets
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Type Product Description Material Composition Slope Applications* Channel Applications* Minimum Tensile Strength 1
Maximum Gradient C Factor 2, 5 Permissible Shear Stresss 3, 4, 6
ULTRA SHORT-TERM - Typical 3 month functional longevity
1.A Mulch Control Nets A photodegradable synthetic mesh or woven biodegradable natural fiber netting. 5:1 (H:V) < 0.10 @ 5:1 = 0.25 lbs/ft2 (12 Pa) 5 lbs/ft (0.073 kN/m)
1.B Netless Rolled Erosion Control Blankets Natural and/or polymer fibers mechanically interlocked and/or chemically adhered together to form a RECP. 4:1 (H:V) < 0.10 @ 4:1 = 0.5 lbs/ft2 (24 Pa) 5 lbs/ft (0.073 kN/m)
1.C Single-net Erosion Control Blankets & Open Weave Textiles Processed degradable natural and/or polymer fibers mechanically bound together by a single rapidly degrading, synthetic or natural fiber netting or an open weave textile of processed rapidly degrading natural or polymer yarns or twines woven into a continuous matrix. 3:1 (H:V) < 0.15 @ 3:1 = 1.5 lbs/ft2 (72 Pa) 50 lbs/ft (0.73 kN/m)
1.D Double-net Erosion Control Blankets Processed degradable natural and/or polymer fibers mechanically bound together between two rapidly degrading, synthetic or natural fiber nettings. 2:1 (H:V) < 0.20 @ 2:1 = 1.75 lbs/ft2 (84 Pa) 75 lbs/ft (1.09 kN/m)
SHORT-TERM - Typical 12 month functional longevity
2.A Mulch Control Nets A photodegradable synthetic mesh or woven biodegradable natural fiber netting. 5:1 (H:V) < 0.10 @ 5:1 = 0.25 lbs/ft2 (12 Pa) 5 lbs/ft (0.073 kN/m)
2.B Netless Rolled Erosion Control Blankets Natural and/or polymer fibers mechanically interlocked and/or chemically adhered together to form a RECP. 4:1 (H:V) < 0.10 @ 4:1 = 0.5 lbs/ft2 (24 Pa) 5 lbs/ft (0.073 kN/m)
2.C Single-net Erosion Control Blankets & Open Weave Textiles An erosion control blanket composed of processed degradable natural or polymer fibers mechanically bound together by a single degradable synthetic or natural fiber netting to form a continuous matrix or an open weave textile composed of processed degradable natural or polymer yarns or twines woven into a continuous matrix. 3:1 (H:V) < 0.15 @ 3:1 = 1.5 lbs/ft2 (72 Pa) 50 lbs/ft (0.73 kN/m)
2.D Double net Erosion Control Blankets Processed degradable natural and/or polymer fibers mechanically bound together between two degradable, synthetic or natural fiber nettings. 2:1 (H:V) < 0.20 @ 2:1 = 1.75 lbs/ft2 (84 Pa) 75 lbs/ft (1.09 kN/m)
EXTENDED-TERM - Typical 24 month functional longevity
3.A Mulch Control Nets A slow degrading synthetic mesh or woven natural fiber netting. 5:1 (H:V) < 0.10 @ 5:1 = 0.25 lbs/ft2 (12 Pa) 25 lbs/ft (0.36 kN/m)
3.B Erosion Control Blankets & Open Weave Textiles An erosion control blanket composed of processed slow degrading natural or polymer fibers mechanically bound together between two slow degrading synthetic or natural fiber nettings to form a continuous matrix or an open weave textile composed of processed slow degrading natural or polymer yarns or twines woven into a continuous matrix. 1.5:1 (H:V) < 0.25 @ 1.5:1 = 2.00 lbs/ft2 (96 Pa) 100 lbs/ft (1.45 kN/m)
LONG-TERM - Typical 36 month functional longevity
4 Erosion Control Blankets & Open Weave Textiles An erosion control blanket composed of processed slow degrading natural or polymer fibers mechanically bound together between two slow degrading synthetic or natural fiber nettings to form a continuous matrix or an open weave textile composed of processed slow degrading natural or polymer yarns or twines woven into a continuous matrix. 1:1 (H:V) < 0.25 @ 1:1 = 2.25 lbs/ft2 (108 Pa) 125 lbs/ft (1.82 kN/m)

* C factor and shear stress for Types 1.A., 2.A. and 3.A mulch control nettings must be obtained with netting used in conjunction with pre-applied mulch material.
1 Minimum Average Roll Values when tested in the machine direction using ECTC Modified ASTM D 5035.
2 C Factor calculated as ratio of soil loss from RECP (rolled erosion control product) protected slope (tested at specified or greater gradient, h:v) to ratio of soil loss from unprotected (control) plot in large-scale testing. These performance test values should be *supported by periodic bench scale testing under similar test conditions using ECTC Test Method # 2.
3 Minimum shear stress RECP (unvegetated) 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. These performance test values should be *supported by periodic bench scale testing under similar test conditions and failure criteria using ECTC Test Method #3.
4 The permissible shear stress levels established for each performance category are based on historical experience with products characterized by Manning's roughness coefficients in the range of 0.01 - 0.05.
5 Acceptable large-scale test methods may include ASTM D6459 or other independent testing deemed acceptable by the engineer.
6Acceptable large-scale testing protocol may include ASTM D6460 or other independent testing deemed acceptable by the engineer.

This page was last modified on 8 November 2016, at 09:57.

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