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53Vegetated coir logs
Vegetated coir logs are biodegradable coconut coir pith logs tightly
packed in tubular netting. They are highly effective in reducing water
velocity at the base of slopes, shorelines, and streambanks. They
are used for controlling dry slope erosion and establishing wetland
edges and stream channel banks.
Coir logs are available either vegetated or unvegetated, in a variety
of sizes. They are grown on a contract basis. As the native species
establish their root systems, the coir logs biodegrade over several
years, allowing a native shoreline to develop. Upon request, Cardno
can provide pre-vegetated coir logs with specific plant species. A
minimum of 8 to 12 weeks growing time is required. Winter orders
may require additional lead time.Specifications
Coir log material:
100% biodegradable coconut fiber, plugged with
native wetland plants. Vegetated coir logs can be custom grown
based on your site conditions. Please allow 8 to 12 weeks lead time.
Plugs are planted 2 per linear foot.
Coir fiber density:
30 cm x 3 m – 11kgs/lm. Larger diameters can
be provided with sufficient lead time.
Exterior net structure:
Coir net: diamond shape mesh.
PP net: knotless diamond shape mesh.
Net mesh size: 5 cm x 5 cm.
Coir net: 4 mm.
PP net: 2 mm.
Final grade should be smooth, free of rocks, sticks, and vegetation.
Do not install vegetated coir logs on hard, compacted soil.
Logs should maintain solid contact with the soil and be installed to
minimize gaps between the bottom of the log and the substrate.
Install logs at the approximate normal water level. Between 1/3 to
2/3 of the log should be submerged.
Drive alternately-spaced hardwood stakes into the soil along the
sides of the log until the top of the stake is about 4 inches above it.
Stakes should be between 3 to 4 feet long, based on application, a
minimum of 1.25 inches thick, and spaced 2 to 3 feet apart.
Notch hardwood stakes approximately 4 inches below the top of the
log deep enough to fit a 3/16 inch nylon rope. Crisscross the rope
over the top of the log. When complete, drive stakes down until rope
is tight against the log. Cut off excess from stakes so they are flush
with the top of the installed log.
Couple adjacent logs together with supplemental rope, wire ties,
or cable ties.
Supplemental plantings can be installed within the log and on the
front and back sides.