nilex ec seminars 1 18-05
TRANSCRIPT
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Erosion Control
Materials
- North American Green Erosion Control Blankets
- Gabions
- Concrete Revetment Systems
- Silt Fence
- GeoRidge
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Types of Erosion
Gully Erosion
Sheet Flow
Rill Erosion
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Types of Erosion
Channel Scour Erosion by Wave Action
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Wind Erosion - Remember the Dust
Bowl!
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• On-Site
Loss of precious topsoil
Instability of structures due to undermining
Regrading and reseeding site
• Off-Site
Sediment Migration from site
Choking and filling of lakes, streams and waterways
Degrades Aquatic habitat
Buries critical spawning gravel and fish eggs
Problems Associated with
Erosion
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Single & Double-Net Straw Blankets
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• Short-Term up to 1 year
– Rapid degrading
• DS75 & DS150
– Photodegradable
• S75 & S150
– Biodegradable
• S75BN & S150BN
North American Green
Short-Term ECBs
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Erosion Control Blankets
• Short Term – straw (3-12) months
• Extended Term- straw coconut , coconut (24- 36) months
• Permanent- TRM’s, C-TRM’s
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Slope Installation
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Channel Installation
Staple Patterns
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Types of Erosion
Channel Scour Erosion by Wave Action
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Wind Erosion - Remember the Dust
Bowl!
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• Short-Term up to 1
year
– Rapid degrading
• DS75 & DS150
– Photodegradable
• S75 & S150
– Biodegradable
• S75BN & S150BN
North American Green
Short-Term ECBs
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Ultra Short-Term ECBs
• DS75 single net, 100% straw matrix
• DS150 top & bottom net, 100% straw matrix
• Rapid degrading thread
• Performance identical to S75 & S150
• Functional longevity up to 2 months
• Ideal for high maintenance areas
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Short-Term
Photodegradable • S75: single net, 100%
straw
• S150; double net, 100%
straw
• Up to 12 mo.
functionality
• Netting & thread are
photodegradable
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Single & Double-Net Straw Blankets
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C125 – Long-Term
• Heavyweight UV stabilized top & bottom net
• 100% coconut fiber matrix
• Functional longevity up to 36 months
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SC150 BioNet
• 100% Natural materials, Leno woven top net
• 70% straw/30% coconut fiber matrix
• Functional longevity up to 18 months
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C125 BioNet
• 100% Natural Fiber
material, Leno woven
top net
• 100% coconut fiber
matrix
• Functional longevity up
to 24 months
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BMP’s
• Best management practices
for soil erosion control and
sediment control
• Protect water quality
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Erosion Control
Prevents soil
movement
Sediment Control
Trap detached soil particles
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Erosion Control/ Prevention
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Sediment Control / Treatment
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• Anywhere land disturbing activities will take place
where erosive forces exceed the limits of
conventional vegetation establishment methods
- Use where mulches
&
blown straw fail
Where and Why Use Temporary
Degradable RECPs
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Why Use Vegetation?
• Low cost
• Ease of use
• Extremely effective
• Aesthetic
• Easy to maintain
• Habitat benefits
• Public demand
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• ECBs provide erosion protection prior to vegetation establishment
– Reduce runoff velocity and volume (improve infiltration of water)
– Reduce soil detachment and transportation
– Absorb raindrop energy
– Trap soil particles
How ECBs Work
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• Organic matrix materials provide mulching action to enhance vegetation establishment
– Moisture absorption and retention
– Reduces soil temperature fluctuation
– Physically supports young plants
Additional Benefits Of ECBs
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• Temporary Degradable RECPs
–
Double Net Extended - Term
RECP
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• Temporary Degradable RECPs
Double Net Long - Term RECP
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GeoRidge System
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GeoRidge Sediment Control Berm
• Easily installed
• Effective
• Permeable
• Reusable
• Easy to store & carry
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GeoRidge Sediment Control Berm
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HISTORICAL USE
• Original product for this application
was hay bales or rock dams
• More recently, synthetic berms
have been introduced to
accomplish this task
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GeoRidge Features
• Length: 1 metre
• Height: 230 mm
• Inside width: 270 mm
• Weight: 1 kilogram
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GeoRidge Function
• Reduces water velocity
• Causes soil & sediment to drop out
• Allows for establishment of vegetation
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Spacing
• Height of GeoRidge/slope in per cent
• 2% slope
– 0.23 m / .02 = 11.5 metre spacing
• 6% slope
– 0.23 m /.06 = 3.8 metre spacing
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Pictures provided A.S. P. Enterprises - Omaha, NE
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March 2003
Russellville Road; Douglas County, CO
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Max. Permissible
Material Shear Stress (lbs/ft2)
Blown Straw 0.00
Sod 1.00
4” Rock Riprap 1.33
Straw Coconut 1.80
6” Rock Riprap 2.00
Coconut 2.25
Channel Liner
Performance Comparison
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• Ideal for use in environmentally
sensitive areas where
synthetics are unwelcome.
• Reduces the likelihood of
wildlife entanglement.
• Excellent for
wetland/bioengineering sites.
• Increased erosion control
capabilities.
100% Biodegradable RECPs
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Biodegradable Net
Weave Patterns
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Channel Installation
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Shoreline Installation
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SedimentSTOP
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Active construction
sites
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Designing with Turf
Reinforcement Mats
(TRM’s)
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TAKING VEGETATION TO
THE HIGHEST POWER
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SC250 • Permanent Matting Structure
Reinforces Vegetation
• Fiber Matrix Provides Immediate Erosion Control and Assists in Seed Germination/growth
• Designed for Severe Slopes & Drainage Channels
High Strength
Top Net
3-D Corrugated
Center Net
Straw/Coconut
Matrix Material
High Strength
Bottom Net Slopes Channels
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C350 • 100% Coconut Fiber Matrix
• C350 Performance Widely
Documented
• Protects Soil, Seed & Root
Systems From Flowing
Water
Super High
Strength Top Net
3-D Corrugated
Center Net
Coconut Fiber
Matrix Material
Super High
Strength Bottom
Net
Slopes Channels
Shorelines
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P550 • Polypropylene Matrix
Increases Permanent Vegetation Reinforcement
• Excellent for Shorelines
• Replacement for Rock and Concrete
Ultra-High Strength
Top Net
3-D Corrugated
Center Net
Polypropylene
Matrix Material
Ultra-High Strength
Top Net
Slopes Channels
Shorelines
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TRM’s
Enable Vegetation Use
In Severe Applications
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• Unvegetated TRM provides primary protection for
seed and bare soil.
• Randomly oriented fibers provide barrier for soil
and seedbed from erosive forces
How TRMs Work
Phase 1 - Pre-emergence
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Partially Vegetated; TRM provides primary
protection and seedling reinforcement
Phase 2
Establishment
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•Fully Vegetated; Vegetation provides primary erosion protection
while TRM provides supplemental erosion control and vegetation
reinforcement (Occurs 6-36 months after installation).
•The permanent structures in the Vmax products reinforces the
vegetation and provides supplemental erosion control to protect
the soil from shear forces penetrating the vegetative cover
Phase III
Mature Vegetation
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Permanently Reinforces &
Anchors Roots & Stems
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Mulching Aspect
Enhances Vegetation
Establishment
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Aesthetics
And
Habitat Enhancement
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Other Applications
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ECONOMIC
BENEFITS
• Less Expensive
to Install Than
Soil In-filled
TRMs
• Up to 60%
Savings Over
Rock Riprap
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Vegetated C-TRMs
Outperform Rock
10
12
14
4
8
10
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
Perm
issib
le
Sh
ear
Str
ess
(lb
s/f
t2)
SC25
0
C35
0P55
0
12" Rock
24" Rock
30" Rock
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