Erosion Control Technology Council standard specifications for erosion control blankets and mulch control nets

Erosion Control Technology Council standard specifications for erosion control blankets and mulch control nets
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ULTRA SHORT-TERM - Typical 3 month functional longevity
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
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 preapplied 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 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.