Indiana LTAP Road Scholar Core Course #10 Porous Pavement. Presented by Megan Elberts, PE Christopher B. Burke Engineering, Ltd.
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1 Indiana LTAP Road Scholar Core Course #10 Porous Pavement Presented by Megan Elberts, PE Christopher B. Burke Engineering, Ltd.
2 Objectives Benefits of Porous Pavement Types of Porous Pavement Pavers Concrete Asphalt Design Considerations Maintenance Considerations Cold Weather Concerns Standards Example Projects
3 What is Porous Pavement? Porous Pavement Surface Aggregate Base Course INDOT #5 s/ IDOT CA-7 Underlying/Native Soils
4 Benefits of Porous Pavement
5 Benefits of Porous Pavement Porous pavements allow rainwater to infiltrate into and through the surface unlike traditional pavement Benefits of porous pavements Increased stormwater infiltration Decreased surface runoff Improved water quality Reduction in runoff velocity
6 Types of Porous Pavement
7 Porous Asphalt Example of a Typical Porous Asphalt Cross Section Porous asphalt is standard hot-mix asphalt with reduced sand or fines that permits water infiltration Image Courtesy of Purdue Physical Facilities and Purdue News
8 Pervious Concrete Pervious concrete is a concrete aggregate mixture that, when finished, has high permeability characteristics Image Courtesy of Ozinga Concrete Example of a Typical Pervious Concrete Cross Section
9 Permeable Pavers Example of a Typical Permeable Paver Cross Section (Advanced Pavement Technology) Permeable pavers consist of concrete paver bricks that have gaps that are filled with stone chips which allow for the infiltration of stormwater into the sub-base Permeable Paver Installation in Riverside, Illinois
10 Infiltration Rates of Porous Pavement Surface Observed Mean Infiltration Rates (inches/hr) Pervious Concrete 1,575 Permeable Pavers 945 Porous Asphalt 80 Infiltration Rates of Permeable Surfaces (Borst et al, 2010)
11 Design Considerations Underlying soils should have an infiltration rate greater than 0.5 inches/hour 10 setback from down-gradient building foundations 100 setback from up-gradient building foundations 100 setback from potable drinking water wells Easements should be considered to allow for future access
12 Maintenance Considerations Routine maintenance is necessary for the long term integrity of the porous pavement Signage identifying the material as porous can help prevent irreversible damage from accidental sealing Material providers can provide specific recommendations Power washing Street sweeping
13 Cold Weather Maintenance Snow Removal Rubber tipped blades Raising blades up to 1 + Deicing Do not use sand Consult manufacturer before using salt Source: Morton Arboretum Morton Arboretum, Lisle, Illinois
14 Does Porous Pavement work in January? Recent studies completed in Toronto, Ontario, New Jersey have all showed that porous pavements still perform during cold weather conditions The Iowa State National Concrete Pavement Technology Center Well-designed pervious concrete mixes can meet strength, permeability, and freeze-thaw resistance requirements for cold weather climates. Mix No. 4-RG-S7 with air entrainment showed the best freeze-thaw durability, with 2% mass loss after 300 freeze-thaw cycles. Studies have shown a reduction in salt usage with porous pavements
15 Mix Standards Asphalt Pavement Association of Indiana (APAI) HMA mixtures for Porous Asphalt Pavements will be Open Graded mixtures designed and produced in accordance with current INDOT Standard Specifications Section 401 as modified by the following exceptions and additions to the specification.
16 Hydrologic Design Considerations The curve number or runoff coefficient for permeable surfaces used in the hydrologic analysis is less than the curve number used for impermeable surfaces CN for Impermeable Surfaces =98 CN for Porous Pavement can range between Using permeable pavements rather than impermeable pavements, could reduce the required stormwater storage volume. Permeable pavements would also reduce the amount of runoff that would have to be conveyed by the surface water collecting systems thereby reducing the size and cost of these collection systems.
17 Hydrologic Design Considerations If the aggregate base course is situated on permeable soils or have an underdrain that has been properly sized to meet release rate requirements, full credit for the storage can be recognized and credited towards the required stormwater storage volume. A porosity value of no greater than 0.36 is suggested when estimating the void space.
18 Hydrologic Design Considerations A third possible type of analysis is to treat the volume of voids below the permeable surface as a reservoir and evaluate it using a reservoir-routing modeling approach I = The inflow rate of water O= The outlet pipe s capacity or the rate of water infiltrating into permeable native soils S= Storage in voids
19 Example Project- Village of Riverside Located in the Village s Central Business District Reduced the volume of stormwater runoff entering the existing combined sewer system and complemented the Village s historic character
20 Example Project- Village of Elmwood Park Replaced 4 residential alleys that were poorly draining and deteriorating with permeable pavers
21 Purdue University-West Lafayette Campus Porous Asphalt Installations Horticulture Service Drive Beering Drive Black Cultural Center Parking Lot Pervious Concrete Armory Marriott Hall Intersection at 3 rd Street and Russell Permeable Pavers Stadium Mall Source: Purdue University News Hilltop Apartments Crossing the Tracks Crossing the Tracks (PASE) Black Cultural Center Parking Lot (Purdue Sustainability Plan)
22 Conclusion Megan Elberts
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