Permeable Pavers and Stormwater Management

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Permeable Pavers and Stormwater Management

• Cheryl Brown, ASLA
• Earth Design, Inc.

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The problem Stormwater Runoff

• Development and Urbanization
• Volume
• Intensity
• Quality
• Sediments and Pollutants
• Watershed wide consequences

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LID - Low Impact Development

• Comprehensive land planning and engineering
  design approach focused on reducing runoff and
  associated pollutants from a given site
• Change from traditional site engineering
• The goal is to maintain and enhance the
  pre-development hydrologic regime of urban and
  developing watersheds

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One of the Solutions -Permeable Pavers

• Pavers that are set on a aggregate base system
  allow on-site stormwater infiltration.

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What are permeable pavers?

• Permeable pavers are specialized individual
  paving units that when installed with the
  appropriate base materials allow the infiltration
  of water and help to reduce runoff from the site

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What are the different types of Permeable Pavers?

• Interlocking Concrete Pavers or Bricks
• Grass Pave
• Gravel Pave
• HydroSTON

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Why should I use Permeable Pavers?

• Offset the addition of impervious surfaces on
  your site by decreasing the potential runoff
• Reduce the need for unsightly detention ponds by
  collecting the water under parking areas
• Get LEED points
• Harvest rainwater for landscape and greywater use
  
• Design Style
• Modular design

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What companies provide Permeable Pavers?

• Belgard
• UNI Eco-Stone
• Sisler Stone
• Grasspave
• Gravelpave
• Hydrocon (Australia)

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How is installation different than standard
pavers?

• Preparation of the subbase is the biggest
  difference between standard paver installation
  and permeable paver installation

• Specialized rigid grids are needed for grasspave
  and gravelpave applications

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Grasspave
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Gravelpave

• Invisible Structures, Inc. Fire Station 9 -
  Savannah, GA with Gravelpave2 - Base - 5 inches
  of 57 stone, over which a mixture of 1.5 of 89
  stone and 3.5 of sand was placed and compacted
  to 92 Modified Proctor

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HydroSTON
Newington College, Stanmore Marrickville NSW
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Possible Problems

• Over time particulate matter can build up in the
  pore space that should be open to collect runoff
  - thus infiltration capacity can decrease over
  time
• Maintenance required involves vacuuming the
  sediment from the joints

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Costs

• Subbase prepartation
• Specialized materials
• Reduced need for infrastructure to handle
  stormwater
• More useable space on site

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References

• Reducing Stormwater Costs through Low Impact
  Development (LID) Strategies and Practices -
  www.epa.gov
• www.icpi.com
• http//www.lid-stormwater.net/permpavers_benefits.
  htm
• http//www.uni-groupusa.org/eco-stone.htm
• http//www.hydrocon.com.au