Erosion Control Solutions
Knowledge. Solutions. Service.
Erosion Control Solutions
CONTECH TRM ULTIMATE PERMISSIBLE
SHEAR STRESS
8
6
4
2
.5 hours
.5 hours
.5 hours
50 hours
50 hours
50 hours
50 hours
50 hours
50 hours
50 hours
Bare
Soil
TRM
C-35
TRM
C-45
Pyramat 6"
Riprap*
12"
Riprap*
Ve
getated
Pyramat
Ultimate Permissible Shear Stress Under Bare Soil Conditions
(lbs/ft
2
)
Flow Duration
See Note 4 – Table 2
.5 hours
20
15
10
5
.5 hours
50 hours
50 hours
50 hours
50 hours
50 hours
50 hours
Bare
Soil
TRM
C-35
TRM
C-45
Pyramat 6"
Riprap*
12"
Riprap*
Ve
getated
Pyramat
Ultimate Permissible Velocities Under Bare Soil Conditions
(ft/second)
CONTECH TRM ULTIMATE PERMISSIBLE
VELOCITY
Flow Duration
See Note 4 – Table 2
.5 hours
.5 hours
.5 hours
50 hours
Water Quality and Soil
Erosion
Soil erosion is a serious environmental
threat and is a major contributor to the
degradation of water quality. Wind, rain
and runoff displace soil particles from
bare or sparsely covered earth, potentially
reducing the stability of the original
site and impairing the performance of
downstream drainage systems.
The strong root structures of well
established vegetation help control soil
erosion. For slopes and channels, erosion
blankets are cost-effective aids for erosion
control and revegetation. CONTECH
Construction Products Inc. offers a
complete line of biodegradable erosion
control fiber blankets and permanent
geosynthetic turf reinforcement mats.
When environmental conditions go
beyond the limits of natural or reinforced
vegetation, CONTECH also offers a full line
of hard armor solutions.
Erosion Control Blankets and Turf
Reinforcement Mats Maintain Water
Quality
With the ultimate goal of establishing
healthy, permanent vegetation, properly
selected erosion blankets offer many
benefits when deployed correctly. These
products are specifically designed to:
Absorb rainfall impact/energy
•
Reduce runoff velocities
•
CONTECH Provides Solutions
for Erosion Control,
Shoreline Protection and
Sediment Control
Only CONTECH offers such a broad range
of high-quality products for establishing
vegetation on disturbed soils, protecting
soil against high-shear stresses, restricting
silt displacement that accompanies runoff
from poorly-vegetated sites and improving
the performance of hard armor shoreline
protection systems. CONTECH products are
the cost-effective solution to soil erosion
and sediment control problems.
Degradable Erosion Control Blankets
Protect Slopes and Channels when
Developing New Vegetation
CONTECH temporary blankets—comprised
of straw fiber, photodegradable
polypropylene, excelsior fibers, straw/
coconut mixed fibers, or 100% coconut
fibers—protect seedlings and later
decompose to provide natural mulch.
Permanent, Non-degradable
Synthetic Turf Reinforcement Mats
Stabilize Vegetated Slopes and
Channels
When flow conditions or other site
factors result in shear stresses that exceed
the limits of natural vegetation alone,
CONTECH’s permanent turf reinforcement
mats maintain the integrity of vegetated
slopes and channels.
Temporary Degradable Blankets
Applications from Mild-to-Steep
Slopes and Mild Channels
SFB1 & SFB2: Straw fiber blankets with
netting on one or both sides. Intended for
mild slopes and channels and are expected
to last approximately 12-18 months.
SCFB2: Straw-coconut fiber blanket that
has two layers of netting. Designed for
moderate slopes and mild channels, they
are intended to last approximately 24
months.
CFB2: A coconut fiber blanket between
two layers of net. Designed for steep
slopes and mild channels and should last
up to 36 months.
EFB1 & EFB2: Excelsior fiber blankets with
one or both sides of netting. Intended for
moderate slopes and mild channels and
normally last approximately 12-18 months.
EFB4: Excelsior fiber blanket with
netting on top and bottom—stitchbonded. Designed for steep slopes and
mild channels and is intended to last
approximately 24 months.
C-Jute: A lightweight, open weave
polypropylene jute blanket. Intended for
mild slopes and channels and should last
approximately 12 months.
Absorb and/or retain moisture
•
Enhance germination by moderating
•
temperature fluctuations and retaining
soil moisture
Entrap soil/sediment
•
Provide root/stem reinforcement
•
Provide natural organic mulch upon
•
breakdown (degradable blankets only)
Facilitate ground water recharge
•
Enhance water quality
•
Temporary erosion control blankets provide
an excellent growing environment for newly
seeded embankments and slopes where
vegetation alone cannot withstand the
natural erosive environment.
CONTECH TRM ULTIMATE PERMISSIBLE
SHEAR STRESS
8
6
4
2
.5 hours
.5 hours
.5 hours
50 hours
50 hours
50 hours
50 hours
50 hours
50 hours
50 hours
Bare
Soil
TRM
C-35
TRM
C-45
Pyramat 6"
Riprap*
12"
Riprap*
Ve
getated
Pyramat
Ultimate Permissible Shear Stress Under Bare Soil Conditions
(lbs/ft
2
)
Flow Duration
See Note 4 – Table 2
.5 hours
20
15
10
5
.5 hours
50 hours
50 hours
50 hours
50 hours
50 hours
50 hours
Bare
Soil
TRM
C-35
TRM
C-45
Pyramat 6"
Riprap*
12"
Riprap*
Ve
getated
Pyramat
Ultimate Permissible Velocities Under Bare Soil Conditions
(ft/second)
CONTECH TRM ULTIMATE PERMISSIBLE
VELOCITY
Flow Duration
See Note 4 – Table 2
.5 hours
.5 hours
.5 hours
50 hours
Erosion Control Solutions Erosion Control Solutions
Permanent Erosion Control Mats Reinforce Natural Vegetation in Critical
Applications
Permanent Synthetic Matting
CONTECH’s turf reinforcement mats (TRMs) provide permanent erosion protection in severe and critical
applications. In such environments, natural vegetation alone cannot endure the service conditions without
experiencing harmful disruptions.
The lofty, three-dimensional, open structure of CONTECH TRMs make these products ideal for entrapping soil,
retaining seeds and—upon germination—reinforcing roots and stems of developing plants.
Vegetated slopes and channels act as natural filters to remove sediment, heavy metals and hydrocarbons. By
improving the performance characteristics of natural vegetation, CONTECH TRMs have become a cost-effective
and popular “green” alternative to paving, riprap and concrete linings for slopes and channels. Aesthetically
pleasing green solutions and bioengineering provide designers flexibility in complying with today’s stringent
environmental laws and provisions of the Clean Water Act.
Table 1
CONTECH TEMPORARY DEGRADABLE EROSION BLANKETS
CONTECH Fiber Mass Netting Functional
Erosion Control Composition (Thickness) Details Longevity
Products
SFB1 100% Straw 0.5 lb/sy Lightweight Plastic 12 months
(0.25”) on 1 side
SFB2 100% Straw 0.5 lb/sy Lightweight Plastic 18 months
(0.25”) on 2 sides
SCFB2 70% Straw 0.5lb/sy Medium Weight Plastic 24 months
30% Coconut (0.25”) Plastic on 2 sides
CFB2 100% Coconut 0.5 lb/sy Heavy Duty Plastic 36 months
(0.25”) on 2 sides
EFB1 100% Aspen 1 lb/sy Lightweight Plastic 12 months
Wood (0.3”) on 1 side
EFB2 100% Aspen 1 lb/sy Medium Weight Plastic 18 months
Wood (0.3”) Plastic on 2 sides
EFB4 100% Aspen 1.6 lbs/sy Heavy Duty Plastic 24 months
Wood (0.4”) on 2 sides—stitched
C-Jute 100% 0.14 lbs/sy Open Weave Material 12 months
1
CONTECH PERMANENT SYNTHETIC TURF REINFORCEMENT MATS
CONTECH Mass Tensile Strength Composition
Erosion Control (Thickness) (Enlongation) (Structure)
Products
TRM C-35 8 oz/sy 145 x 110 lbs/ft 100% polypropylene
(0.35”) (50% max) (stitched, random matrix)
TRM C-45 10 oz/sy 170 x 125 lbs/ft 100% polypropylene
(0.25”) on 2 sides
TRM C-512 14 oz/sy 300 x 225 lbs/ft 100% polypropylene
(0.50”) (85% max) (stitched, random matrix)
TRM C-60 14 oz/sy 220 x 165 lbs/ft 100% polypropylene
(0.60”) (40% max) (stitched, random matrix)
Pyramat® HP-TRM 14 oz/sy 4000 x 3500 lbs/ft 100% polypropylene
(0.50”) (50% max) (woven, three-dimensional)
1. Figures are typical values unless otherwise indicated.
2. Functional longevity represents an approximation of the product’s life performance. Actual
in-service functional longevity can vary widely due to extreme and diverse environmental
factors. Contact your local CONTECH sales engineer for additional guidance.
3. Biodegradable netting may be available upon special request. Contact your local CONTECH
sales representative for availability.
Photodegradable N/A
Polypropylene
1. Figures are typical values unless otherwise indicated.
2. Functional longevity represents an approximation of the product’s life performance. Actual
in-service functional longevity can vary widely due to extreme and diverse environmental factors.
Contact your local CONTECH sales representative for additional guidance.
3. Biodegradable netting may be available upon special request. Contact your local CONTECH sales
representative for availability.
Table 2
1
Erosion Control and Turf
CONTECH TRM ULTIMATE PERMISSIBLE
SHEAR STRESS
8
6
4
2
.5 hours
.5 hours
.5 hours
50 hours
50 hours
50 hours
50 hours
50 hours
50 hours
50 hours
Bare
Soil
TRM
C-35
TRM
C-45
Pyramat 6"
Riprap*
12"
Riprap*
Ve
getated
Pyramat
Ultimate Permissible Shear Stress Under Bare Soil Conditions
(lbs/ft
2
)
Flow Duration
See Note 4 – Table 2
.5 hours
20
15
10
5
.5 hours
50 hours
50 hours
50 hours
50 hours
50 hours
50 hours
Bare
Soil
TRM
C-35
TRM
C-45
Pyramat 6"
Riprap*
12"
Riprap*
Ve
getated
Pyramat
Ultimate Permissible Velocities Under Bare Soil Conditions
(ft/second)
CONTECH TRM ULTIMATE PERMISSIBLE
VELOCITY
Flow Duration
See Note 4 – Table 2
.5 hours
.5 hours
.5 hours
50 hours
Reinforcement for Most
Environments
Due to a wide range of engineering properties and
performance capabilities, designers can custom match
their project conditions to the most suitable CONTECH
Turf Reinforcement Mat.
Grass Waterways, Channels and Slopes
Applications
CONTECH TRM C-35, C-45 and C-60: These are dense,
three-dimensional webs of UV-stabilized polypropylene
fibers, randomly oriented and stitched together
between two nets to impart high strength and stability.
As indicated in Table 2, these products vary in mass and
strength for different levels of performance.
Channels and Slopes to Prevent Soil
Transportation and Piping
CONTECH TRM C-51: This product is comprised of a
dense three-dimensional web of black, UV-stabilized
polypropylene fibers, randomly oriented, then stitched
together between two nets and bonded to a nonwoven
geotextile. It is designed for permanent applications
in channels and slopes where soil transportation and
piping is a primary concern.
High-Volume Channels and Steep Slopes
PYRAMAT® HP-TRM: This very high-strength, resilient,
permanent, high-performance TRM consists of threedimensional pyramid-like projections. It is designed for
more severe applications such as high-volume channels
and steep slopes or other installations requiring added
safety factors and durability.
CONTECH TRMs reinforce vegetation to resist shear forces in high-flow
channels. Vegetated TRMs can provide protection equal to 12” riprap
under most environmental conditions.
Erosion Control Solutions
The building boom of the past 25 years has increased stormwater runoff volumes and peak fl ows.
The direct result of this growth are the requirements of the National Pollutant Discharge Elimination
Temporary and permanent erosion control solutions are recognized BMPs.
CONTECH Silt Fence Controls Sediment
Uncontrolled silt deposits fl owing from unprotected
construction sites can create health, safety and
environmental problems. Recent regulations, covering
virtually every construction site today, mandate runoffrelated sediment control.
CONTECH Silt Fence is a site-proven, effective and
economical method to control
runoff-carried sediment. Silt
Fence offers a combination of
UV resistance, strength and
hydraulic properties to make
them idea for use in aboveground sediment control
applications.
CONTECH Silt Fence helps maintain overland sheet fl ow and fi lters out
suspended soil particles, preventing downstream deposition and acting as
a defensive erosion control practice.
CONTECH Offers a Variety of Other
Erosion Control Solutions
Synthetic Engineering Solutions with
Geotextiles
CONTECH offers the broadest range of high-quality
geosynthetics available: woven and non-woven. CONTECH
Geotextiles, with their high strength and defi ned fi ltration
qualities, have a solid history of long-term performance in
applications involving separation, fi ltration, drainage and
erosion control.
Woven Geotextiles
Woven geotextiles are generally preferred for applications
that need high strength properties, have less critical fi ltration
requirements and do not require planar fl ow. Since woven
textiles, on a unit weight basis, achieve higher strengths
at lower elongations than non-woven geotextiles, they are
extremely effi cient in strength priority applications.
Non-Woven Geotextiles
Non-woven geotextiles are needle-punched, continuous
fi lament engineering fabrics that provide fi ltration and
planar fl ow, reduce hydrostatic pressure and prevent subsoil
migration. Typical applications include subsurface drainage
systems, roadway separation, hard armor underlayment and
asphalt overlays.
Hard Armor Solutions for Channels, Streams and
Shoreline Applications
The Armortec® family of products (including ArmorFlex®,
A-Jacks®, ArmorWedge™ and ArmorLoc®) can be used
to protect against erosion and scour in the most severe
hydraulic conditions.
Modular Welded Wire Gabions for Erosion Control
and Bank Stabilization
Modular Welded Wire Gabions are fabricated from steel
wire mesh assembled into rectangular cells of varing size.
They are fi lled with stone to form a monolithic, fl exible
structure which provides low cost, long-term erosion
control and soil stabilization.
Cellular Confi nement Systems Create an Erosion
Barrier
Cellular Confi nement Systems employ a fl exible HDPE
matrix fi lled with native granular materials to create an
erosion barrier. These systems have been proven on a
variety of construction, architectural, landscaping, and
erosion control situations.
NPDES Regulations Require Immediate Action
The building boom of the past 25 years has increased stormwater runoff volumes and peak fl ows.
The direct result of this growth are the requirements of the National Pollutant Discharge Elimination
Temporary and permanent erosion control solutions are recognized BMPs.
The building boom of the past 25 years has increased stormwater runoff volumes and peak fl ows.
The direct result of this growth are the requirements of the National Pollutant Discharge Elimination
Systems Act (NPDES) that mandates that stormwater runoff be controlled to reduce damage to
municipal sewers and waterways.
Stormwater doesn’t just runoff. It carries pollutants, sediment and debris, contaminating the
drainage system—which empties into streams, lakes and rivers, degrading water quality. Stormwater
management issues are nationwide, and with the implementation of Phase II of NPDES, the issues will
surface on nearly every construction site. Operators affected by Phase II are required to implement
stormwater discharge management controls known as “Best Management Practices” or BMPs.
Temporary and permanent erosion control solutions are recognized BMPs.
CONTECH Construction Products Inc. provides cost-effective solutions to
soil erosion and sediment control problems.
©2009 CONTECH Construction Products Inc.
800.338.1122
www.contech-cpi.com
CONTECH Construction Products Inc. provides site solutions for the civil engineering industry. CONTECH’s portfolio includes bridges, drainage, sanitary sewer, stormwater and
earth stabilization products. For information on other CONTECH division offerings, visit contech-cpi.com or call 800.338.1122.
Nothing in this catalog should be construed as an expressed warranty or an implied warranty of merchantability or fi tness for any particular purpose. See CONTECH standard
condition of sales (viewable at www.contech-cpi.com/cos) for applicable warranties and other important information.
The product(s) described may be pro
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