Erosion and Sediment Pollution Control Program Manual.pdf

Fiber rolls, or coir logs, are cylindrical structures composed of natural materials, such as coconut husk,
bound together with twine. It is commonly manufactured in 12” and 18” diameters with lengths of
20 feet. Fiber rolls are often staked at the toe of slope (stream-forming elevation, Q2 level) below
bioengineering systems (e.g. live stakes).
PA DEP
Fiber rolls encourage plant growth within the roll by trapping sediment.
Prefabricated rolls can be expensive. When wet, they can be rather heavy and cumbersome to handle.
Some manufacturers have estimated their effective life to be 6 to 10 years.
APPLICATIONS
Fiber rolls can be used to protect slopes from shallow slides or undermining.
Because of their flexibility, they can be molded to the existing curvature of the streambank.
INSTALLATION GUIDELINES
It is recommended that the fiber roll be saturated prior to installation to minimize floatation.
Excavate a shallow trench at the toe of slope to a depth slightly below the channel grade.
Place the fiber roll in the trench.
Drive 2” X 2” X 36” stakes between the binding and the fiber, as shown in Figure 15.10. Stakes
should be placed on 2 to 4 foot centers depending upon anticipated flow velocities. Tops of
stakes should not extend above fiber roll. Where floatation is a possibility, the landward stakes
may be driven perpendicular to the bank slope.
363-2134-008 / March 31, 2012 / Page 323