Coir sediment control for slopes, inlets and site perimeters
Help intercept sediment before runoff carries it farther across a site. Nedia offers two natural coir systems: KoirFence, a woven sediment-control fabric, and KoirWattle, a flexible fiber roll that follows the ground surface.
Each has a different installation method and role in an erosion and sediment control plan. Use the product summaries below to compare the formats, then review applications, installation guidance and technical specifications in the tabs.
KoirFence™ 1250
A tightly woven, biodegradable coir fabric for staked sediment barriers. The fabric helps filter sediment-laden runoff while allowing water to pass through.
Format: woven coir fabric Standard roll: 3 ft × 100 ft Mass per unit area: 37 oz/yd² (1,250 g/m²)
Flexible rolls of coconut fiber enclosed in high-strength, knotted coir netting. Installed in contact with the soil, they help slow runoff and trap sediment.
Diameters: 6 in and 9 in Standard lengths: 10 ft and 20 ft Core density: 7 lb/ft³ (112 kg/m³)
KoirWattle typically lasts two to five years, depending on exposure and site conditions. Compare both diameters in the Technical Specification tab.
Choose the right format for the site
KoirFence forms a supported fabric barrier. KoirWattle creates a low-profile barrier along the soil surface and can be arranged across slopes or around inlets where the project design permits.
Select the product, size, spacing and anchoring for the expected runoff, soil and site geometry. A wattle is an alternative to silt fence only where the project specifications allow it.
Both systems use natural coir that gradually biodegrades. Inspect and maintain them throughout the required sediment-control period; the site plan determines when material should remain, be replaced or be removed.
Use these general guidelines with the project drawings. Stake selection, spacing, trench dimensions and layout must suit the ground conditions and expected runoff.
KoirFence 1250
Set out the fence along slope contours as shown on the plans so runoff can pond on the upslope side.
Install 2 × 2 in hardwood stakes at 3–6 ft on center, subject to the project requirements.
Bury the bottom edge in a 4 × 4 in anchor trench and secure it in contact with the soil.
Tie the fabric to the top, middle and bottom of each stake with KoirTwine or BioTwine.
KoirFence: staked support and anchored lower edge.
KoirWattle at curb and drop inlets
Place wattles around the inlet in the arrangement shown on the site plan.
Bring adjoining ends together tightly, with no gaps that allow runoff to bypass the barrier.
Secure the wattles with the specified stakes or anchoring system and maintain contact with the ground.
See Installation on Slopes and Installation in Channels for the corresponding KoirWattle layouts.
Inspection and upkeep
Inspect after storm events and at the intervals required by the site plan. Repair displaced fabric, loose stakes, gaps and undercut areas. Remove accumulated sediment when necessary and place it where it can be permanently stabilized. Replace damaged or degraded material when it no longer performs its intended function.
Lay out rows along slope contours according to the erosion-control plan.
Prepare anchor trenches and seat the wattles firmly against the soil. Trench depth and row spacing depend on slope and soil conditions.
Drive hardwood stakes through the middle and ends of each wattle. Nedia’s general guidance uses stakes at 3–4 ft on center; follow the spacing and stake dimensions specified for the project.
Join adjacent ends closely and secure the complete row so runoff passes through or over the wattles, rather than underneath.
Inspect the installation after rainfall and repair any gaps, displacement or erosion around the rows.
Coordinate the wattle rows with seeding, erosion-control matting and other vegetation-establishment measures shown on the plans.
Confirm the specified locations and spacing of the check structures.
Place wattles across the channel, perpendicular to the direction of flow. Nedia’s general guidance calls for 2–4 in deep anchor trenches; use the project requirements for the actual site.
Seat each wattle against the soil, close the joints between sections and secure it with the specified anchoring.
Inspect after runoff events for displacement, bypass flow, undercutting and sediment accumulation. Repair and maintain the installation as needed.
The project designer should determine whether a wattle check structure is suitable for the channel and the expected flow conditions.
Perimeter sediment barriers on construction and restoration sites
Storm-drain inlet protection where specified in the site plan
Windblown-snow containment
Matting for walkways
KoirWattle 6 & 9
Sediment interception along slope contours
Storm-drain inlet protection
Check structures in swales and waterways where specified by the project designer
Construction-runoff sediment control and site-perimeter barriers
Post-fire rehabilitation and vineyard erosion control
Landscape edging and vegetated filter applications
The appropriate layout depends on the site. Use the approved erosion and sediment control plan to determine placement and any supporting measures.
Installation and maintenance
Use these general guidelines with the project drawings. Stake selection, spacing, trench dimensions and layout must suit the ground conditions and expected runoff.
KoirFence 1250
Set out the fence along slope contours as shown on the plans so runoff can pond on the upslope side.
Install 2 × 2 in hardwood stakes at 3–6 ft on center, subject to the project requirements.
Bury the bottom edge in a 4 × 4 in anchor trench and secure it in contact with the soil.
Tie the fabric to the top, middle and bottom of each stake with KoirTwine or BioTwine.
KoirFence: staked support and anchored lower edge.
KoirWattle at curb and drop inlets
Place wattles around the inlet in the arrangement shown on the site plan.
Bring adjoining ends together tightly, with no gaps that allow runoff to bypass the barrier.
Secure the wattles with the specified stakes or anchoring system and maintain contact with the ground.
See Installation on Slopes and Installation in Channels for the corresponding KoirWattle layouts.
Inspection and upkeep
Inspect after storm events and at the intervals required by the site plan. Repair displaced fabric, loose stakes, gaps and undercut areas. Remove accumulated sediment when necessary and place it where it can be permanently stabilized. Replace damaged or degraded material when it no longer performs its intended function.
KoirWattle on slopes
Lay out rows along slope contours according to the erosion-control plan.
Prepare anchor trenches and seat the wattles firmly against the soil. Trench depth and row spacing depend on slope and soil conditions.
Drive hardwood stakes through the middle and ends of each wattle. Nedia’s general guidance uses stakes at 3–4 ft on center; follow the spacing and stake dimensions specified for the project.
Join adjacent ends closely and secure the complete row so runoff passes through or over the wattles, rather than underneath.
Inspect the installation after rainfall and repair any gaps, displacement or erosion around the rows.
Coordinate the wattle rows with seeding, erosion-control matting and other vegetation-establishment measures shown on the plans.
KoirWattle in channels
Confirm the specified locations and spacing of the check structures.
Place wattles across the channel, perpendicular to the direction of flow. Nedia’s general guidance calls for 2–4 in deep anchor trenches; use the project requirements for the actual site.
Seat each wattle against the soil, close the joints between sections and secure it with the specified anchoring.
Inspect after runoff events for displacement, bypass flow, undercutting and sediment accumulation. Repair and maintain the installation as needed.
The project designer should determine whether a wattle check structure is suitable for the channel and the expected flow conditions.
Technical specifications
Typical product values are shown below. MD is machine direction; TD and CD refer to transverse or cross direction. Use the project specifications and the applicable product sheet when selecting materials.
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