permeable pavements
DESCRIPTION
Permeable Pavements. Shingle Creek Watershed Management Commission May 31, 2011. Outline. Purpose of presentation Types of pavements and applications Benefits Design considerations Maintenance considerations Example projects Questions. Types of Permeable Pavements. Porous Asphalt - PowerPoint PPT PresentationTRANSCRIPT
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Permeable Pavements
Shingle Creek Watershed Management CommissionMay 31, 2011
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Outline
Purpose of presentation Types of pavements and
applications Benefits Design considerations Maintenance considerations Example projects Questions
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Types of Permeable Pavements
Porous Asphalt Pervious Concrete Pervious Pavers
Permeable pavement has pores or openings that allow water to pass through the surface and stone base material and infiltrate into the underlying soils.
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Pervious Pavers
Porous Asphalt
Pervious Concrete
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Pervious Pavement Hydrology
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Porous HMA (or Dense HMA with Piping)
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John Barten, second from right, riding on pervious pavement in Medina around 1905.
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Water Storage in Pervious Concrete System
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Porous Asphalt Section
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Pervious Concrete Paver
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Project Applications
Streets Parking lots Sidewalks and paths Driveways Patios Playgrounds
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Potential Benefits
Reduces the rate and quantity of stormwater runoff
Reduces stress on the sewer system
Recharges groundwater Filters out silt, pollutants, and
debris Maintains natural drainage paths Reduces standing water nuisance
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Potential Benefits
Reduces stormwater infrastructure needs (pipes, ponds, catch basins)
Offers good alternative to conventional stormwater mitigation
Better erosion control Reduces ice buildup and need for
salting during the winter Provides better traction
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Design Considerations
Soils Depth to groundwater Traffic loading Slopes Blowing dust and debris
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Design Considerations
Unique site features Agency stormwater regulations Frost penetration
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Permeable Pavement Limitations
Use of permeable pavement is not recommended in the following cases: Industrial “brownfield sites or
sites with contaminated soils Where site layouts direct clogging
sediment on the pavement surface
Sites with excessively steep grades
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Maintenance Considerations Protect pavement from silt and
sediment during and after construction
Vacuum sweep at least twice a year
Do not seal coat Do not sand Use caution when snowplowing Post signs advising maintenance
crews
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Maintenance Considerations Perform periodic inspections; look
for clogging, raveling, cracking, and wear
Other???
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Ongoing Maintenance -Vacuum Sweeping
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Sweepings
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Maintenance Warning Signs
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Paired Intersection Study, Robbinsdale, MN
Porous asphalt test section - Abbott/41st , 2009
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Porous Subgrade Preparation
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Porous Asphalt Placement
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Cost
Test section = 150 feet long, 27 feet wide
Traditional pavement, contract unit prices = $14,125 =$32/SY
Porous pavement– Site 1 = $42,670– Site 2 = $32,200
“Upcost” = $35-50/SY
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Residential Street Paving Project, Shoreview, MN
Lake Owasso
Asphalt replaced with pervious concrete, 2009
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Shoreview Water Infiltration Demo
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Pervious Concrete Cost ComparisonCommon Excavation – 11,000CY($6.00/CY) = $
66,000*Fabric – 11,000SY($1.00/SY) = $ 11,0001-1/2” Crushed Rock – 5000CY($52.00/CY) = $260,000*7” Pervious Concrete – 8470SY($46.50/SY) =
$394,000Total Cost for Pervious Concrete System =
$731,000Per SY Cost for Pervious Concrete System = $
86.30** *Average depth beneath concrete = 1.75-feet
Estimated Bituminous Road Cost = $257,000Estimated Underground Infiltration Cost = $417,500Total Est Cost – Bit Road & Infiltration = $674,000Per SY Est Cost – Bit Road & Infiltration = $
79.60**
**8.5% Increased Cost for Pervious Concrete
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Wolner Field Parking Lot, Mound, MN
Before After
Asphalt replaced with pervious concrete and draintile, 2007
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Pavement Cost Comparison
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Mound Transit Center, Mound, MN
Installed pervious pavers, 2007
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Subgrade preparation
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Little Six Casino, Prior Lake, MN
Porous asphalt pavement in parking lot, 2009
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Brainerd Area
Porous asphalt parking lot, 2006
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• You've carefully thought out all the angles.
• You've done it a thousand times.
• It comes naturally to you.
• You know what you're doing, its what you've been trained to do your whole life.
• Nothing could possibly go wrong, right ?
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