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    Pervious Pavement City Portland

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    AjmalPk
    Pervious pavement is a type of pavement that allows water to pass through it and infiltrate into the ground below. It is made of pervious asphalt or pervious concrete which have spaces that allow water to pass through, unlike traditional pavement. Pervious pavement reduces stormwater runoff and recharges groundwater. It requires less maintenance than traditional pavement and can help reduce or eliminate the need for separate stormwater systems. Proper installation and maintenance is required to keep the spaces open and allow permeability.

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    Pervious Pavement City Portland

    Uploaded by

    AjmalPk
    23 views2 pages
    Pervious pavement is a type of pavement that allows water to pass through it and infiltrate into the ground below. It is made of pervious asphalt or pervious concrete which have spaces that allow water to pass through, unlike traditional pavement. Pervious pavement reduces stormwater runoff and recharges groundwater. It requires less maintenance than traditional pavement and can help reduce or eliminate the need for separate stormwater systems. Proper installation and maintenance is required to keep the spaces open and allow permeability.

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    Journal on pervious pavement

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    Pervious pavement is a type of pavement that allows water to pass through it and infiltrate into the ground below. It is made of pervious asphalt or pervious concrete which have spaces that allow water to pass through, unlike traditional pavement. Pervious pavement reduces stormwater runoff and recharges groundwater. It requires less maintenance than traditional pavement and can help reduce or eliminate the need for separate stormwater systems. Proper installation and maintenance is required to keep the spaces open and allow permeability.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    23 views2 pages

    Pervious Pavement City Portland

    Uploaded by

    AjmalPk
    Pervious pavement is a type of pavement that allows water to pass through it and infiltrate into the ground below. It is made of pervious asphalt or pervious concrete which have spaces that allow water to pass through, unlike traditional pavement. Pervious pavement reduces stormwater runoff and recharges groundwater. It requires less maintenance than traditional pavement and can help reduce or eliminate the need for separate stormwater systems. Proper installation and maintenance is required to keep the spaces open and allow permeability.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
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    Pervious

    PERVIOUS PAVEMENT
    pavement (porous pavement, porous concrete/asphalt)

    P
    allows ervious pavement is made of either pervious asphalt or pervious concrete.
    precipitation Both materials resemble conventional asphalt and concrete, but have more
    to air spaces that allow water to pass through the pavement into a reservoir
    percolate base of crushed aggregate, then infiltrate into the ground. Pervious pavement is
    through designed to accept precipitation only and is typically thicker than traditional con-
    to the crete to support the same loads.
    ground

    Pervious asphalt consists of coarse stone aggregate and asphalt binder, with
    very little fine aggregate. Water percolates through the small voids left in the fin-
    ished asphalt. A thick layer of gravel underneath allows water to drain through
    quickly. Pervious asphalt looks similar to conventional asphalt, although with a
    rougher surface, which accounts for its common name “popcorn mix.”

    Pervious concrete consists of specially formulated mixtures of Portland cement,


    open-graded coarse aggregate, and water. It has enough void space to allow
    rapid percolation of water and resembles exposed aggregate concrete.

    Benefits twice a year maintains porosity. Properly


    Pervious pavement reduces stormwater installed pervious paving systems last more
    runoff flow rate and volume, recharges than 20 years.
    groundwater and maintains stream base
    flows. The subgrade also filters pollutants. Cost
    Pervious pavement is less prone to cracking Pervious concrete pavements range in cost
    or buckling from freezing and thawing. depending on the size of the installation. In
    Studies indicate it requires less frequent the Bureau of Environmental Services North
    repair and patching than conventional Gay Avenue Project (Summer 2005), a pervi-
    paving. In some cases, pervious pavement ous concrete street cost about $100 per
    may reduce or eliminate the need for an square yard installed, including base rock.
    underground storm drain system or a curb
    Safety and Siting Requirements
    and gutter system. Pervious pavement is an
    • Follow manufacturer’s installation
    effective method of managing stormwater
    instructions.
    runoff without limiting use of the space.
    • Weather conditions during installation can
    Maintenance affect the performance and longevity of
    It is important to control site erosion and pervious pavement. Check with manufac-
    sedimentation of the pavement surface to turers for guidelines.
    prevent clogging and maintain permeability.
    • Slope must be less than 10% over the
    Cleaning or vacuuming the surface once or
    paved area.
    • Use pervious pavement over soils that
    drain well, like gravelly or loamy sand. Permits
    • Pervious pavement systems used to
    • Do not use pervious pavements in areas replace public parking or walkway areas
    with high sediment loads. require a building permit from the City’s
    • Pervious pavement is not allowed in areas Bureau of Development Services.
    where hazardous material is stored or • Stormwater systems on non-residential
    transported. sites need commercial building permits.
    • Most systems include an under layer of at
    Examples
    least 12 inches of clean gravel over a layer
    The Rebuilding Center of our United Villages,
    of geotextile fabric. The under layer serves
    parking lot, 3625 N. Mississippi Ave.
    as an underground detention basin and
    should include an overflow outlet to pre-
    N. Gay Avenue
    vent water from rising through the pave-
    between N. Wygant and N. Sumner
    ment.
    (pervious concrete and asphalt)
    • Refer to Portland’s Stormwater
    Management Manual for details on sizing, Pervious Concrete at Broadway Pump Station,
    placement, and design. NE 91st and Broadway

    Ecotrust Building Parking Lot (Drive aisles),


    721 NW 9th Ave.

    Pervious concrete

    base rock

    www.cleanriverspdx.org or 503-823-7740
    WS 0603
    July 2006
    For Clean River Rewards information www.CleanRiverRewards.com or 503-823-1371

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