The Promise of Permeable Pavement
by Jeanna Henry
When it rains, or as snow and ice melt, I frequently notice streams of water running off of my lawn, onto the street, into the storm sewer, and ultimately to a local waterway. I’ve also noticed an increase in flooded roadways and neighborhoods in my area even after a moderate to heavy rain. Unfortunately, stormwater is not just a localized issue, it is a problem across the country. As the saying goes: when it rains, it pours.
Flooding results in economic costs, human health impacts, and environmental damage in its wake. A major factor in more frequent flooding events is the increasing cover of impervious surfaces, such as roadways, parking lots and rooftops. Since these hard surfaces do not allow stormwater to naturally seep into the ground, most rainfall turns into runoff. With continuing development and growth, what options are available to minimize the effects of impervious surfaces? A more sustainable solution is to replace or substitute conventional pavements with permeable pavements – a green infrastructure tool.
Permeable pavements include pervious concrete, porous asphalt, and permeable interlocking pavers that mimic nature by capturing, infiltrating, treating, and/or storing rainwater where it falls. EPA considers these materials a Best Management Practice (BMP) for the management of stormwater runoff. Permeable pavements also provide multiple benefits beyond stormwater management and reducing localized flooding: they also have the ability to improve water quality; reduce the “heat island” effect in urban areas; reduce roadway hazards like ponding water and icing; create green jobs; and can increase the livability and resiliency of communities and increase property values when used with other green infrastructure. In fact, these benefits are already being realized throughout EPA’s Mid-Atlantic Region.
- EPA’s Green Streets, Green Jobs, Green Towns collaborative, in partnership with the Chesapeake Bay Trust and the Maryland Department of Natural Resources, supports local, grassroots-level greening efforts by towns and communities in urbanized areas to reduce stormwater runoff through the creation of “green streets” and the reduction of impervious surfaces.
- The City of Philadelphia’s Water Department is using porous pavement as part of its Green City, Clean Waters program for combined sewer overflow control. Philadelphia also has several Green Stormwater Infrastructure Programs which promote the use of permeable pavements in applications such as service roads and alleyways, walkways, and parking lots.
Permeable pavements along with green infrastructure are effective ways to address flooding as well as supporting green, sustainable growth. So the next time it rains, think about where permeable pavements and other types of green infrastructure could fit into your community.
About the author: Jeanna Henry joined EPA in 2000 as an Environmental Scientist. She currently works in the Water Protection Division focusing on stormwater management through the use of Green Infrastructure. Jeanna loves nothing more than spending time outdoors with family and friends hiking, kayaking, or spending a day at the beach.
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