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  • The Central Corridor Light Rail Project was an opportunity to demonstrate multiple green infrastructure practices in a highly urbanized, linear area between Saint Paul and Minneapolis. These practices improve the quality of storm-water runoff, aesthetics and sustainability of the Corridor. Project partners include Metropolitan Council, Capitol Region Watershed District, City of Saint Paul and Ramsey County. Known as the Green Line, trains will be running in spring 2014.

    The greening of the Green Line

    Green infrastructure along the Green Line treats stormwater and adds beauty to University Avenue in Saint Paul.

    Tree Trench along University Avenue

    1410 Energy Park Drive, Suite 4Saint Paul, MN 55108

    651-644-8888www.capitolregionwd.org

    The greening of the Green Line

  • rain garden tree trenchinltration trench light rail station stopsstormwater planter

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    The greening of the Green Line

    Whats Green Infrastructure?A stormwater management approach that uses natural landscape features and hydrologic processes to treat stormwater by infiltrating or reusing runoff. Green Infrastructure can also help meet other environmental goals such as carbon sequestration, reductions in urban heat island effect, improved air quality, improved wildlife habitat and increased opportunities for outdoor recreation.

    rain garden

    Polluted rainwater

    Curb opening

    Roots channeling

    water

    Hardy plants

    Sand filter

    Original soil

    Modified soil

    Polluted rainwater stormwater planter

    Polluted rainwater

    Curb opening

    Roots channeling

    water

    Hardy plants

    Sand filter

    Original soil

    Modified soil

    Polluted rainwater

  • rain garden tree trenchinltration trench light rail station stopsstormwater planter

    Wes

    tgat

    e

    Raym

    ond

    Fairv

    iew

    Snel

    ling

    Ham

    line

    Lexi

    ngto

    n

    Vict

    oria

    Dale

    Wes

    tern

    Capi

    tol/R

    ice

    Robert

    Union

    Depot

    Central

    10th

    Pillsb

    ury

    Aldine

    Alber

    tSy

    ndica

    teGr

    iggs

    Oxfor

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    St. Al

    bans

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    Green infrastructure practices were installed along University Avenue and adjacent streets along portions of the light rail running through Saint Paul. The drainage area is 111 acres of highly developed land with large tracts of industrial, commercial and residential areas. The high amount of impervious surfaces direct large amounts of stormwater runoff and pollutants to the storm drain system and ultimately the Mississippi River. Four types of practices are used to improve water quality and control runoff volume along the light rail project area.

    Rain gardens were constructed in the boulevard on four side streets by CRWD.

    Five side streets have stormwater planters in the boulevard constructed by CRWD.

    Two side streets have infiltration trenches constructed by the City of Saint Paul.

    Over five miles of tree trench with over 1,000 trees was constructed by Metropolitan Council on both sides of University Avenue in Saint Paul.

    It is estimated that the project reduces stormwater runoff by more than 50%, and removes 80 pounds of phosphorus and 40,000 pounds of sediment annually.

    Graphics courtesy of Barr Engineering Co.

    infiltration trench

    Polluted rainwater

    Perforatedpipes

    Water soaksinto ground Rock trench

    Excess water to storm sewer

    tree trench

    Polluted rainwater

    Storm drain

    Roots channeling

    water

    Sand filter

    Original soil

    Modified soil

    Polluted rainwater

    Permeable pavers

    Green infrastructure along the Green Line treats stormwater and adds beauty to University Avenue in Saint Paul.

  • The greening of the Green Line

    Project partnersCapitol Region Watershed District

    Metropolitan Council

    Ramsey County

    City of Saint Paul

    Project costApproximately $5,000,000

    Grant funding

    MN Clean Water Legacy Fund

    Resources

    CRWD: capitolregionwd.org

    Met Council: metrocouncil.org

    City of Saint Paul: stpaul.gov

    Ramsey County: co.ramsey.mn.us

    MN Clean Water Legacy Fund: bwsr.state.mn.us/cleanwaterfund

    Syndicate Street rain garden

    Oxford Street stormwater planters

    1410 Energy Park Drive, Suite 4Saint Paul, MN 55108

    651-644-8888www.capitolregionwd.org

    To draw public attention

    to the practices, the work

    of metal artist Lisa Elias

    is featured.

    Elias created artistic railings

    that can be seen around the

    stormwater planters and

    rain gardens.