Nilex ec seminars 1 18-05

Erosion Control

Materials

- North American Green Erosion Control Blankets

- Gabions

- Concrete Revetment Systems

- Silt Fence

- GeoRidge

Types of Erosion

Gully Erosion

Sheet Flow

Rill Erosion

Types of Erosion

Channel Scour Erosion by Wave Action

Wind Erosion - Remember the Dust

Bowl!

• 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

Single & Double-Net Straw Blankets

• Short-Term up to 1 year

– Rapid degrading

• DS75 & DS150

– Photodegradable

• S75 & S150

– Biodegradable

• S75BN & S150BN

North American Green

Short-Term ECBs

Erosion Control Blankets

• Short Term – straw (3-12) months

• Extended Term- straw coconut , coconut (24- 36) months

• Permanent- TRM’s, C-TRM’s

Slope Installation

Channel Installation

Staple Patterns

Types of Erosion

Channel Scour Erosion by Wave Action

Wind Erosion - Remember the Dust

Bowl!

• Short-Term up to 1

year

– Rapid degrading

• DS75 & DS150

– Photodegradable

• S75 & S150

– Biodegradable

• S75BN & S150BN

North American Green

Short-Term ECBs

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

Short-Term

Photodegradable • S75: single net, 100%

straw

• S150; double net, 100%

straw

• Up to 12 mo.

functionality

• Netting & thread are

photodegradable

Single & Double-Net Straw Blankets

C125 – Long-Term

• Heavyweight UV stabilized top & bottom net

• 100% coconut fiber matrix

• Functional longevity up to 36 months

SC150 BioNet

• 100% Natural materials, Leno woven top net

• 70% straw/30% coconut fiber matrix

• Functional longevity up to 18 months

C125 BioNet

• 100% Natural Fiber

material, Leno woven

top net

• 100% coconut fiber

matrix

• Functional longevity up

to 24 months

BMP’s

• Best management practices

for soil erosion control and

sediment control

• Protect water quality

Erosion Control

Prevents soil

movement

Sediment Control

Trap detached soil particles

Erosion Control/ Prevention

Sediment Control / Treatment

• 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

Why Use Vegetation?

• Low cost

• Ease of use

• Extremely effective

• Aesthetic

• Easy to maintain

• Habitat benefits

• Public demand

• 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

• 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

• Temporary Degradable RECPs

–

Double Net Extended - Term

RECP

• Temporary Degradable RECPs

Double Net Long - Term RECP

GeoRidge System

GeoRidge Sediment Control Berm

• Easily installed

• Effective

• Permeable

• Reusable

• Easy to store & carry

GeoRidge Sediment Control Berm

HISTORICAL USE

• Original product for this application

was hay bales or rock dams

• More recently, synthetic berms

have been introduced to

accomplish this task

GeoRidge Features

• Length: 1 metre

• Height: 230 mm

• Inside width: 270 mm

• Weight: 1 kilogram

GeoRidge Function

• Reduces water velocity

• Causes soil & sediment to drop out

• Allows for establishment of vegetation

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

Pictures provided A.S. P. Enterprises - Omaha, NE

March 2003

Russellville Road; Douglas County, CO

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

• 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

Biodegradable Net

Weave Patterns

Channel Installation

Shoreline Installation

SedimentSTOP

Active construction

sites

Designing with Turf

Reinforcement Mats

(TRM’s)

TAKING VEGETATION TO

THE HIGHEST POWER

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

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

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

TRM’s

Enable Vegetation Use

In Severe Applications

• 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

Partially Vegetated; TRM provides primary

protection and seedling reinforcement

Phase 2

Establishment

•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

Permanently Reinforces &

Anchors Roots & Stems

Mulching Aspect

Enhances Vegetation

Establishment

Aesthetics

And

Habitat Enhancement

Other Applications

ECONOMIC

BENEFITS

• Less Expensive

to Install Than

Soil In-filled

TRMs

• Up to 60%

Savings Over

Rock Riprap

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