national asphalt pavement association

Porous Asphalt Pavements with Stone Reservoirs for Stormwater Management

Kent Hansen, P.E.National Asphalt Pavement Association

Reduce storm water runoffReduce pollution from stormwater

runoffPromote groundwater rechargeReduce/eliminate retention/detention

area

Porous Asphalt Pavements

Why?

Stormwater carries a host of contaminantsfrom the land into the water

Roadways, for example, release oil and grease, tailpipe emissions, and other toxicsfrom motor vehicles.

As impervious surfaces channel large quantities of rainwaterinto streams at high velocity, the runoff wreaks havoc. The flow scours stream banks, destabilizes stream contoursand alters depths.

Ref: University of New Hampshire Stormwater Center 2007 Annual Report

Water Quality

Ref: University of New Hampshire Stormwater Center 2007 Annual Report

Performance

Many projects over 20 years old.Well over 200 nationwide

Montgomery Co.

Porous Asphalt

Not proprietaryAny quality asphalt producer can makePlaced using standard equipment

Designers & contractors need educationNot for every pavement

Parking lots most likelySite conditions important

Contact InformationFor further information contact:

Kent Hansen, P.E.Director of EngineeringNational Asphalt Pavement Association5100 Forbes Blvd.Lanham, MD 20154301-731-4748khansen@hotmix.orgBrian Dolan and Greg MooreMaryland Asphalt Pavement Association2408-G Peppermill Dr.Glen Burnie, MD 21061(410) 761-2160bdolan@mdasphalt.org