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.