There are multiple forms of porous pavement in use in the United States including porous asphalt, porous concrete, and a wide variety of porous pavers and pre-cast slabs. For this Porous Alley project, porous asphalt was selected because asphalt is the most common paving material used in Boston's streets and alleys, and is relatively low in ...

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Porous asphalt is a pilot material that the city is testing at select locations. Use of this material beyond the city-led pilots will require a maintenance agreement. Can be proposed for use in parking lanes, parking lots, and recreational paths. Must have adequate sub-surface conditions to detain stormwater and level bottom to allow for ...

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Porous Asphalt The Specs Tim Horton, Skillings Connolly Jessica Knickerbocker, City of Tacoma Mark A. Palmer, P.E., LEED AP, City Engineer, City of Puyallup WAPA/WSDOT/LTAP Joint Training-March 2015. Porous Asphalt: ... Street • Various Alleys ...

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POROUS GRAVEL SHOULDER MIX Municipal Stormwater Conference November 6, 2014 12 •Mix used by City of Puyallup is blend developed by PW Streets. Uses a standard 1-1/4" CSBC rock blended with #57 rock. •CSBC had void content of 12.5% •#57 rock had void content of 41.3% •Staff mixes the rock manually at 1:1 ratio •Used as reservoir course and for porous gravel …

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POROUS ASPHALT: CONSIDERATION FOR USE 6. Porous asphalt is a good product for local roads, parking lots and trails. •Parking lots are tough test-low speed turning motions •Resist temptation to mix porous with impermeable pavements in same section •Depth of section can be an issue on high volume roads-consider pervious concrete to avoid existing utilities and for life cycle cost

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Porous asphalt pavement, on the other hand, is a type of type porous pavement structure specifically designed to allow rainfall and runoff to flow into and through the pavement structure. Porous pavement offers the potential to collect and/or slow the rate of run-off from other impervious surfaces.

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Porous asphalt is an environmentally friendly tool for stormwater management. POROUS ASPHALT PAVEMENTS In the natural environment, rainfall sinks into soil, filters through it, and eventually finds its way to streams, ponds, lakes, and underground aquifers. The built environment, by way of contrast, seals the surface. Rainwater and

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• Porous asphalt has the potential to be an effective ultra-urban BMP. • Porous asphalt works by allowing: streets, parking lots, sidewalks, and other impervious covers to retain their natural infiltration capacity while maintaining the structural and functional features of the materials they replace.

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Porous Pavement Improves Provincetown Harbor Beaches, Nonpoint Source Success Story, U.S. EPA (PDF) (2 pp, 1.2 , About PDF) Watch and Learn. Pervious Pavement a Cost-Effective Alternative for City Streets A performance study finds pervious concrete a good fit for a Minnesota lakeside neighborhood.

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Another notable application is the Buffalo, New York street projects where seven residential streets will be converted to porous asphalt pavement to relieve flooding in North Buffalo. Porous asphalt has other applications. Porous asphalt surface mixes are also used by highway engineers, but instead of putting it over a stone recharge bed, they ...

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The air void ratio for the small radius aggregates asphalt mixture specimen is 4%. For the single layer porous asphalt mixture specimens the air voids are 2.3%, 2.7%, 6.6%, 7.5%, 17.4% and 18.4%. The air voids for the top and bottom layers of the double layer porous asphalt mixture specimen are 10% and 25% respectively.

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• porous pavement maintenance costs: – 2x annual street sweeping, $1,000/yr regen vacuum – no crack sealing – no patching due to frost heave or base failure – no resurfacing due to cracking, etc • total life cycle cost savings: – $57 750$57,750 if street sweeping is done on hma anyway

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roadways with light traffic (i.e. residential subdivision streets), bike paths, and pedestrian walkways. Porous concrete sidewalk at Penn State University (Source of photograph: Cahill Associates) Porous asphalt parking lot at University of Rhode Island. Porous asphalt pathway at Swarthmore College. (Source of photograph: Cahill Associates) 3

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The North Gay Avenue Pervious Pavement Pilot Project had two main goals: To permanently re-pave streets damaged during the sewer work in 2001. The old concrete streets cracked badly, and the current asphalt is of temporary quality. To provide information on how porous concrete and asphalt perform as a street surface.

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Cost, Intersection Design, and Porous Pavements for Commercial Facilities. The manual contains the necessary information to allow the user to do the following: 1) Select and specify the correct asphalt concrete mix for a given application. 2) Select and specify the most appropriate asphalt binder for the application and climate.

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References/Resources • Porous Pavement Presentation, City of Puyallup, WA– Resource 1 under this session number on the conference website. Extra focus on mix design and aggregate selection for asphalt, choker, and base courses.

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Porous asphalt pavements have successfully been used for residential and urban streets. Highway engineers also use porous asphalt surface mixes. Instead of putting the porous asphalt over a stone bed, they pour it as a thin surface layer on …

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