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Spongier Surfaces Reducing Stormwater Runoff

2012 August 9

By Trey Cody

Think about the sponge on your kitchen sink.  When you hold it under the running faucet, it absorbs a surprising amount of water.  But what if the sponge was covered in plastic wrap?  The water would hit the surface and flow right off.  We can see this same concept at work in our urbanized watersheds where, in many areas, green space that once absorbed rainfall has been replaced by hard surfaces that water can’t penetrate.

There are lots of ways that cities and towns are trying to get closer to their original, spongy state.  Having a surface that is porous and permeable reduces the effects of stormwater runoff on receiving streams, like stream bank erosion and negative effects on aquatic plant and animal life.

That’s why porous paving projects are popping up all over the place.  Permeable paving refers to a different way of mixing or constructing concrete or asphalt that allows water to flow through the pavement and into the ground instead of over it.

One project can be found in our neighboring EPA Region 2’s Laboratory in Edison, New Jersey (above), where three permeable surfaces are being tested on the site of a former concrete parking lot. The performance and capabilities of these systems are being documented as part of a long term project to study the effects of paving materials such as porous asphalt, porous concrete, and interlocking concrete paver blocks. The parking lot will be monitored for its ability to accept, store, and infiltrate stormwater, water quality performance, urban heat island mitigation, maintenance effects, and parking behavior.

Closer to our regional office home, the first porous street in Philadelphia was recently unveiled.   And Washington D.C. has done a number of Green Alley Projects using permeable pavement for the street surfaces.  Have you seen other examples of pervious pavement near you?

To learn more about permeable pavement and other green infrastructure techniques, and how it benefits water quality, check out EPA’s Green Infrastructure Page.

2012 marks the 40th anniversary of the Clean Water Act, the nation’s law for protecting our most irreplaceable resource.  Throughout the year, EPA will be highlighting different aspects of the history and successes of the Clean Water Act in reducing pollution in the past 40 years.  The month of August will focus on Science and Innovation.

About the Author: Trey Cody has been an intern with EPA’s Water Protection Division since graduation from high school in 2010. He is currently attending the Pennsylvania State University.

Editor's Note: The opinions expressed in Greenversations are those of the author. They do not reflect EPA policy, endorsement, or action, and EPA does not verify the accuracy or science of the contents of the blog.

4 Responses leave one →
  1. Christina Catanese permalink*
    August 10, 2012

    Check out this video with more about the parking lot project in Edison!

    Like or Dislike: Thumb up 5 Thumb down 2

  2. August 13, 2012

    That would be very interesting for the cities to begin making more porous streets to ease the impact on the storm sewers. We at our home have a water collection system from our roof that waters our lawn during droughts and also automatically waters the livestock.

    Like or Dislike: Thumb up 1 Thumb down 0

  3. Ben permalink
    August 14, 2012

    Thanks, Christine, for posting a video I could watch on my iPad. The one in the post body above seems to require Flash. EPA: please upgrade your video content to HTML5 containers and include us mobile users who lack Flash.

    Like or Dislike: Thumb up 0 Thumb down 0

  4. suraj purohit permalink
    March 29, 2013

    Well its really nice stuff and we people will like to get such more ….. thanks for such helpful one.
    by Suraj Purohit

    Like or Dislike: Thumb up 0 Thumb down 0

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