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Coconut Fiber Logs

KoirLog™ 12, 16 & 20

Overview

KoirLog™s are natural coconut fiber logs with applications in wetland mitigation, shoreline stabilization and stream banks/channel protection. Nedia’s KoirLog™s are made from double cleaned, unsorted coconut fiber encased in high tensile strength coir twine netting. KoirLog™s help to dissipate the impact from wave action and flowing water, trap sediments and encourage vegetation growth.

During installation, seedlings or plant cuttings can be planted into the KoirLog™. Sediment trapped by the KoirLog™ as well as the inherent property of the coir fiber to absorb and retain moisture provides an ideal medium for vegetation establishment and growth.

Sizes:

KoirLog™s are available in 12”, 16” and 20” diameters. The logs are typically 10 or 20 feet long.

Densities:

KoirLog™s are available in Normal Density (ND Series) of 7 lbs/cu .ft. and High Density (HD Series) of 9 lbs/cu .ft. KoirLog™s with a normal density of 7 lbs/cu .ft. (ND Series) are easier to handle, install and plant. The normal density logs also encourage rapid root development. Designers must evaluate the site conditions in order to choose the appropriate size, density and number of tiers of KoirLog™s to be used. Some parameters to consider are flow velocity, wave height, stream energy, soil type and accessibility to the project site.

Longevity:

KoirLog™s generally last for two to five years. As the KoirLog™ biodegrades, the plants develop a well established root system in the shoreline sediment which will retain the soil in place preventing further erosion. The decomposing KoirLog™s provides valuable humus to the soil.

Typical Applications

  • Stream banks stabilization
  • Shoreline protection
  • Wetland mitigation
  • Channel edge liner
  • Wildlife habitats
  • Landscaping

Advantages

  • 100% biodegradable
  • An excellent planting medium
  • Encourages deposition
  • Easy to install
  • Safe for wildlife and the environment
  • Economical

Installation Guidelines

  • Determine on site where the installation should begin and end. Usually installation begins downstream. Sediment and erosion control measures such as silt fence and sediment barriers should be in place of disturbances on work site. Prepare the site of installation by removing large rocks or other such obstructions. Re-grade slope, if necessary. Gradual slopes, flatter than 2:1 are preferred.
  • Determine the mean water elevation. Mark the level on a stake driven into the substrate 1 to 2 feet off-shore. KoirLog™s (fig 1) should be 1/2 to 2/3 below mean water elevation for the survival of vegetation.
  • KoirLog™s must be level, installed along a horizontal contour and parallel to the stream banks. KoirLog™s can be installed adjacent to the shoreline (fig. 2 & 3) or away from the shoreline (fig. 4 & 5) depending on the prevailing physical conditions.
  • When KoirLog™s are installed adjacent to the shoreline, drive pencil point hardwood stakes (2” x 2” x 36”) through at least 2 loops of the outer netting of the KoirLog™ on the waterside. Stakes can be spaced 3’ on center for medium flow conditions and 2’ apart on center for rapid flow conditions. KoirTwine™ or BioTwine™ can be used to tie the logs to the stakes. Stakes should be driven down so that the top of the stake is level with the top of the KoirLog™. KoirLog™s shall be placed along the stream banks at a height sufficient to protect the shore from flows or waves. Additional KoirLog™s (fig. 3) may be stacked above the lower logs to protect the upper shore or stream banks.
  • When KoirLog™s are installed away from the shoreline, the area behind (fig. 5) the logs can be backfilled and covered with KoirMat™ to create an aquatic shelf. Alternatively, the area (fig. 4) behind the log can be stabilized using pre vegetated KoirBed™. For off – shore applications, drive stakes 1 to 2 feet on center along both sides of the KoirLog™ in parallel rows. Lacing across the stakes is a good method to hold the KoirLog™s in place. Weave lacing back and forth across the KoirLog™ and attach the lacing to each stake using knots, notches, staples or nails.
  • Adjacent KoirLog™s must be laced together, end to end, tightly and securely with KoirTwine™ or BioTwine™ (fig. 6)
  • Ends of the KoirLog™ not abutting another KoirLog™ must be bent towards the shore and dug into the banks to prevent the water from flowing behind the KoirLog™s causing them to be pulled out.
  • Plant the KoirLog™ with appropriate native plant species after the KoirLog™ has been submerged in water for a short period of time. Insert fingers or a planting iron through the outer netting to create a hole for the plant plug. Gently push the plug deep into the KoirLog™. Recommended spacing of the plant plugs is 4” to 12” along two lines in a staggered pattern.
  • Cover the root ball by wrapping coir fiber around the base of the stem. Check to ensure that the plants have been firmly installed in the substrate. Plants and materials have to be monitored approximately 3-4 weeks after installation to ensure the success and survival of the plants and the integrity of the materials.

Pattern Guide

Figure 1 Site Preparation

Figure 2 KoirLog™ installed along the shoreline

Figure 3 Stacked KoirLog™s

Figure 4 KoirLog™ installed off-shore

Figure 5 Stacked KoirLog™s to create aquatic shelf

Figure 6 KoirLog™ splice detail

Technical Specifications:

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