Embed Size (px)
Citation preview
Final Cover Stormwater Management:
Alternative Materials of Construction
Prepared By:
Paul Shamoian, EIT and Amy Knight, P.E.
May 2015
Prepared For
2015 NEW YORK FEDERATION CONFERENCE
► State Regulations Closure/Post-Closure
▪ Final Cover Stormwater Design
o 25-year, 24-hour storm
▪ Post-Closure Care
o Maintain system for 30 years
Final Cover Stormwater Management
▪ Initial Capital Costs
▪ Long Term O&M Costs
o Traditional materials
o Alternative materials
Stormwater Management System Design
► Objectives
▪ Control and convey stormwater runoff from design storm
o Curve Numbers
o Flow lengths
o Drainage areas
o Precipitation/Duration
▪ Minimize leachate generation
▪ Minimize erosion
o Steep landfill slopes
o High velocities
▪ Slope stability
Typical Stormwater Structures
► Diversion Berms
▪ Tack on or Built in benches
o Erosion control mat
o Vegetation
o Rip rap
► Downchutes
▪ Gabions
▪ Rip rap
▪ Cable concrete block
▪ Pipes
► Swales
▪ Perimeter or road side
o Erosion control mat, vegetation, rip rap, concrete
VEGETATION / EROSION CONTROL MAT
► Constructability
▪ Fast production rate
▪ Erosion control throughout construction
▪ Seasonal for vegetation growth
► Post-Closure
▪ Mowing/Maintenance
▪ Longevity
▪ Repairs for erosion
GABION LINED DOWNCHUTES
► Constructability
▪ Labor intensive
▪ Slow production rate
▪ Connection of diversion berms to downchute/downdrain challenging
► Post-Closure
▪ Good velocity control
▪ Difficult maintenance
▪ Siltation
▪ Settlement
GABION LINED DOWNCHUTES
RIP RAP
► Constructability
▪ Materials vary
▪ Different uses
o Swales/Downchutes/Berms
▪ Fast production rate
► Post-Closure
▪ Good velocity control
▪ Mowing/Weeding
▪ Siltation
▪ Rock movement
RIP RAP
CABLE CONCRETE BLOCK
► Constructability
▪ Labor intensive
▪ Slow production rate
▪ Subgrade material important
► Post-Closure
▪ Settlement
▪ Mowing/weeding
▪ Siltation
CABLE CONCRETE BLOCK
PIPE DOWNCHUTES
► Constructability
▪ Typical installation
▪ Sizes vary
o Corrugated interior for velocity control
▪ Built into subgrade layer
▪ Mound over pipe for coverage
▪ Flared end inlets from benches/berms
► Post-Closure
▪ Debris/Litter Clogging
▪ Siltation
PIPE DOWNCHUTES
►SmartDitch™
►Concrete Cloth™
ALTERNATIVE MATERIALS
► Constructability
▪ Light weight
▪ Built into final cover soils for downchutes
▪ Moderately labor intensive on final cover geosynthetics
▪ Limited sizes (12” & 24”)
▪ Can weld to geomembrane
▪ Anchor to final cover with rainflap
▪ Fabricated sections for pipes installed through side
ALTERNATIVE MATERIALS - SMARTDITCH™
ALTERNATIVE MATERIALS - SMARTDITCH™
ALTERNATIVE MATERIALS - SMARTDITCH™
►Post-Closure
▪ Limited long term data
▪ Good velocity control
▪ No mowing/weeding
▪ Weather resistant
▪ Easy to remove debris/blown litter
▪ Flexible with settlement of landfill
ALTERNATIVE MATERIALS - SMARTDITCH™
► Constructability
▪ Heavy by the roll
▪ Flexible
▪ Multiple uses
▪ Can install pipes through cloth
▪ Different thicknesses
o (CC5, CC8, CC13)
▪ Used in conjunction with other materials
▪ Easy to overlap/connect pieces
▪ Keep covered with plastic until ready to hydrate
▪ Hydrate with water to harden
ALTERNATIVE MATERIALS – CONCRETE CLOTH™
ALTERNATIVE MATERIALS – CONCRETE CLOTH™
►Post-Closure
▪ Limited long term data
▪ High velocity
o Options to control
▪ No mowing/weeding
▪ Weather resistant
▪ Lightweight for concrete
▪ Easy to remove debris/blown litter
ALTERNATIVE MATERIALS - CONCRETE CLOTH™
COST COMPARISON
Material Capital Cost (Typ. Range) Production Rate
Vegetation/ECM $15 - $25 / LF Fast production
Pipe $30 - $50 / LF Moderate production
Rip Rap $4 - $6 / SF
$32 - $48 / LF (8’ wide channel) Moderate production
Concrete Cloth™ $5 - $8 / SF
$40 - $64 / LF (8’ wide channel) Moderate production
SmartDitch™ $85 - $125 / LF
(2 foot depth) Moderate production
Gabions $120 - $150 / LF Slow production
Cable Concrete Block
$20 - $25/ SF
$160 - $200 / LF (8’ wide
channel)
Slow production
*Historical unit costs are typical average values from previous construction bid results. Costs range for different
reasons such as states, available materials on site, public/private bids, union, etc.
SUMMARY
► Typical Materials for Construction
▪ Moderate to high capital costs
▪ Long term maintenance issues
▪ Long term O&M costs
▪ Settlement
► Alternative Materials for Construction
▪ Moderate to high capital costs
▪ Less anticipated long term maintenance issues
▪ Less anticipated long term O&M costs
▪ Less anticipated long term settlement issues
QUESTIONS?
Paul Shamoian
Civil & Environmental Consultants, Inc.
31 Bellows Road · Raynham, MA 02767
(774) 501-2176 ·
