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Engineered Earth Armoring Solutions ™ Todd Larson
Engineered Earth Armoring Solutions™
Todd Larson
www.propexglobal.compg 2
Manufacturing Experience
• ISO 9001:2008 Certified Facility
• American Association of Laboratory Accreditation (A2LA)
• GAI-LAP Accredited Testing Laboratory
• Manufacturing Quality Control (MQC) Program
• Manufactured Woven TRM/HPTRMs since 1994
• Manufactured in the USA
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Engineering & Construction QC Experience
Slope Stability Analysis & Design Hydraulic Analysis & Design
Plan & Detail Generation Testing & Field Support
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Problem: Earth Moves
Accelerated Erosion = Natural Erosion + Human Activities
• Construction• Poor Stewardship• Removal of
Vegetation• Increased
Impervious Areas
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US Clean Water Act Regulation Facts
• US$13 Billion Cost Annually
• Over US $1 Billion removing sediment from waterways annually
• EPA estimates sediment removal from reservoirs costs US $500 million annually.
• Annual water storage replacement costs from sediment range from US $2 to US$6 billon
The Driving Force:
• EPA Environmental Protection Agency – Via Clean Water Act (CWA)
NPDES – National Pollutant Discharge Elimination System:
• Use of Best Management Practices for NPDES Compliance (EPA TRM Fact Sheet)
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Hard Armoring Traditional Solutions Rock Riprap Slopes
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Hard Armoring Traditional Solutions Rock Riprap Channels
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Paved Concrete Channel
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Which one?
• What looks better?
• Which is a BMB?
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Slope Protection!
• Again?
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Hard Armoring "Progressive" Solution“Outside the Box”
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Soft Armoring "Progressive" Solution
“Outside the Box”
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EEAS = Improved Water Quality
• EPA Clean Water Act
✓ Restore the Chemical, Physical & Biological Integrity of US Waters
• Clean Water is vital
✓ Pollutant Removal
✓ Groundwater Table Recharge
✓ Irrigating Crops
✓ Livestock
✓ Wildlife/Aquatic Life
✓ Fish Consumption
✓ Recreation
✓ Reservoir Storage
✓ Public Drinking Water Supply
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Engineered Earth Armoring Solutions (EEAS) – Alternative Solution
SYSTEM H
PTRM/TRM
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EEAS = Reinforced Vegetation
Root ReinforcementStem Reinforcement
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EEAS = Reinforced Vegetation
Turf Reinforcement Mat (TRM)• Synthetic Material
• Vegetative Growth
• Stitch Bonded or Woven
• <3,000 lb/ft Tensile Strength
High Performance Turf Reinforcement Mat (HPTRM)
• Synthetic Material
• Vegetative Growth
• Homogenous Woven
• ≥3,000 lb/ft Tensile Strength
• Improved Performance
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Unreinforced Vegetation
Do Nothing
RAISING THELIMITS OFNATURAL
VEGETATION
LIMITS OFNATURAL
VEGETATION
16 lb/ft2 SHEAR STRESS25 ft/s VELOCITY
2 lb/ft2
SHEAR STRESS
EEAS = Raising the Limits of Natural Vegetation
10 lb/ft2 SHEAR STRESS18 ft/s VELOCITY
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Which TRM Or System Should I Use?
Stitch Bonded/Woven TRM
or
High Performance TRM (HPTRM)
or
Engineered Earth Armoring System (HPTRM + Engineered Earth Anchor)
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Design Life
Determined based on:
• Durability✓ Ultraviolet (UV) Resistance
• Ultimate Tensile Strength✓ Material Quality
• Hydraulic Stresses✓ Velocities/Shear
• Non-Hydraulic Stresses✓ Heavy Mowing Activity
✓ Maintenance Loading
✓ Debris Loading
✓ Animal Loading
✓ Wildlife Burrowing
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Non-Hydraulic Stresses – Heavy MowingFHWA HPTRM Requirements
Federal Highway Administration (FHWA):
recommends minimum tensile strength
3,000 lbs/ft (44 kN/m) when long-term
durability is of concern.
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ARMORMAX® 75
ARMORMAX® = Engineered Earth Armoring Solution™ composed of:
PYRAMAT 75 High Performance Turf Reinforcement Mat + Engineered Earth Anchors (EEA™)
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• Flexible/Soft armoring solution for slopes, channels, levees, spillways
• Expanded Engineering Applications
✓Critical structures
✓Wave overtopping
✓Erosive forces
✓Shallow plane slope stabilization
✓Underwater protection
✓Wave run-up
✓Higher Factor of Safety
• Vegetation provides environmental and aesthetic benefits
ARMORMAX® 75
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ARMORMAX® 75
• Engineered Earth Anchors are
designed to provide resistance
to shear and lateral forces, and
embedded beyond the predicted
plane of failure
• HPTRM distributes loads
amongst anchors while providing
a continuous compressive cover
• HPTRM is also permeable for
pore pressure relief and
promotes vegetative
establishment
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Engineered Earth Anchor
• Percussion Driven Anchor
• Type B1 Anchor
✓3-5 ft (0.9-1.5 m) length
✓200-600 lbs (0.89-2.67 kN) pullout resistance
• Type B2 Anchor
✓6-12 ft (1.8-3.6 m) length
✓800-2,000 lbs (3.56-8.90 kN) pullout resistance
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Bartlett Boulevard – Bartlett, TN
ARMORMAX® 75 Slope Stabilization
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ARMORMAX® 75 Dam Slope Stabilization Combined with other BMPs
Club Lake Dam – Greenville, TX
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ARMORMAX® 75 Spillway Installation
Lake Olgetree Spillway Modifications – Auburn, AL
Engineered Wrap-face
Vegetated Solution
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FEATURES & BENEFITS
• Immediate erosion protection upon installation
• Vegetated BMP for:✓ NPDES Storm Water Compliance
✓ Improved water quality
• PYRAMAT 75 provides:✓Superior UV resistance
✓Durable, permeable and vegetated wall face
✓Trilobal X3® Fiber Technology improves vegetation establishment
• PYRAWALL height/steepness ✓1H:4V (max.)
✓7-ft height with no with primary geogrid reinforcement
✓Can be used with primary geogrid reinforcement for higher walls/slopes
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Engineered Wrap-face Vegetated Solution for Constructing Reinforced-Earth Walls and Steepened Slopes
New Best Management Practice
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• Interlaced bracing :✓Eliminates the need for
temporary metal bracing or forms
✓Environmentally inert and not susceptible to corrosion
• Flexibility of system allows for:✓Curves to be incorporated
✓On-site soil to be used for infill
• System is easily transported
• Available in Green or Tan
FEATURES & BENEFITS
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BRACE ASSEMBLY
Step 1 Step 2 Step 3 Step 4
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CONSTRUCTION SEQUENCE
Completed Wall Prior to Vegetation
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DESIGN – WALL STABILITY
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DESIGN – GLOBAL STABILITY
Shoreline Defense System (SDS)
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Introducing SCOURLOK Shoreline Defense System (SDS) for vegetated shoreline applications
• Bank protection
• Toe protection
Shoreline Defense System
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Typical Section
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• Metal frame basket
✓ Material - Galvanized/S.S.
✓ 3-ft W x 3-ft D x 4-ft H
• Pre-assembled units
✓ Internally lined w/ durable geotextile
✓ Externally lined with PYRAMAT
• Each unit = 5 baskets = 15-ft long
• Outside pocket filled with mulch or other growth media for vegetation
System Components
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• In-Situ Soils
• up to 15% organic
• Gravel and rock
• up to 3-inches
• Dredge (coastal)
Fill Material
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With ARMORMAX®
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DESIGN – WALL STABILITY
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DESIGN – GLOBAL STABILITY
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Summary
LANDLOK TRMs• > 25 Years• > 20 Million SY
PYRAMAT TRM/HPTRMs• > 20 Years• > 14 Million SY
ARMORMAX• > 10 Years• > 5 Million SY
• Tested, Approved, and Specified by USACE
• Validated Field, 3rd Party UV and Hydraulic Testing
Closing Questions - Comments
