Permeable Pavers and Stormwater Management by psb58920

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									 Permeable Pavers and
Stormwater Management

      Cheryl Brown, ASLA
     Earth Design, Inc.
The problem: Stormwater Runoff
•   Development and Urbanization

•   Volume
•   Intensity
•   Quality

•   Sediments and Pollutants

•   Watershed wide consequences
    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
          One of the Solutions -
           Permeable Pavers

•   Pavers that are set on a aggregate base
    system allow on-site stormwater infiltration.
   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
    What are the different types of
        Permeable Pavers?
•    Interlocking
     Concrete Pavers
     or Bricks
•    Grass Pave
•    Gravel Pave
•    HydroSTON
    Why should I use Permeable
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
      What companies provide
       Permeable Pavers?
•   Belgard
•   UNI Eco-Stone
•   Sisler Stone
•   Grasspave
•   Gravelpave
•   Hydrocon (Australia)
    How is installation different than
           standard pavers?
•   Preparation of the
    subbase is the
    biggest difference
    between standard
    paver installation and
    permeable paver
•   Specialized rigid grids are needed for
    grasspave and gravelpave applications

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

Newington College, Stanmore Marrickville NSW
            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

Subbase prepartation
Specialized materials
Reduced need for infrastructure to handle
More useable space on site
•   Reducing Stormwater Costs through Low Impact Development
    (LID) Strategies and Practices -

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