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    Street Surf

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    Aryansach Oktavianur
    The document summarizes a project to reduce combined sewer surcharges in Skokie and Wilmette, Illinois through the use of street surface storage. Berms were installed along curb lines to detain stormwater runoff on the street surface. Flow regulators were also added to catch basins to control discharge into the combined sewer system. This approach provided over half of the total stormwater storage capacity needed at a lower estimated cost than conventional sewer separation. The street storage system helped alleviate basement flooding, reduced combined sewer overflows, and provided a traffic calming benefit. Community acceptance of the project required public outreach and education.

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

    Street Surf

    Uploaded by

    Aryansach Oktavianur
    18 views3 pages
    The document summarizes a project to reduce combined sewer surcharges in Skokie and Wilmette, Illinois through the use of street surface storage. Berms were installed along curb lines to detain stormwater runoff on the street surface. Flow regulators were also added to catch basins to control discharge into the combined sewer system. This approach provided over half of the total stormwater storage capacity needed at a lower estimated cost than conventional sewer separation. The street storage system helped alleviate basement flooding, reduced combined sewer overflows, and provided a traffic calming benefit. Community acceptance of the project required public outreach and education.

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    Street Surf Jalanan Ibukota dalam Penerapan

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    The document summarizes a project to reduce combined sewer surcharges in Skokie and Wilmette, Illinois through the use of street surface storage. Berms were installed along curb lines to detain stormwater runoff on the street surface. Flow regulators were also added to catch basins to control discharge into the combined sewer system. This approach provided over half of the total stormwater storage capacity needed at a lower estimated cost than conventional sewer separation. The street storage system helped alleviate basement flooding, reduced combined sewer overflows, and provided a traffic calming benefit. Community acceptance of the project required public outreach and education.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    18 views3 pages

    Street Surf

    Uploaded by

    Aryansach Oktavianur
    The document summarizes a project to reduce combined sewer surcharges in Skokie and Wilmette, Illinois through the use of street surface storage. Berms were installed along curb lines to detain stormwater runoff on the street surface. Flow regulators were also added to catch basins to control discharge into the combined sewer system. This approach provided over half of the total stormwater storage capacity needed at a lower estimated cost than conventional sewer separation. The street storage system helped alleviate basement flooding, reduced combined sewer overflows, and provided a traffic calming benefit. Community acceptance of the project required public outreach and education.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    United States

    Environmental Protection Agency


    Office of Water (4203)
    Washington, DC 20460
    EPA-841-B-00-005C
    October 2000



    LOW-I MPACT
    DEVELOPMENT
    CENTER
    Street Storage for

    Com


    bined Sewer Surcharge
    Control

    Skokie and Wilmette, Illinois
    Key Conc ept s:
    Street Storage
    Flow Regulation
    Street & Inlet Modifications
    Source Control
    Pr oj ec t Benef i t s:
    Elimination of Surcharge
    Community Acceptance
    Cost Savings
    I nt r oduc t i on
    This case study describes the use of street storage
    and catch basin modifications to reduce the rate of
    runoff entering combined sewer systems (CSSs).
    These modifications help alleviate residential
    basement flooding that results from CSS
    surcharging during rainfall events. Because
    building relief sewers would be both expensive
    and disruptive, the communities of Skokie and
    Wilmette, Illinois, were willing to try alternative
    approaches. The communities decided to modify
    street cross sections and storm drain inlets so the
    street surfaces could store and convey runoff
    during peak storm events and reduce hydraulic
    loading to the combined sewer. This process
    required extensive coordination with regional,
    state, and local officials and residents to ensure
    that safety and community acceptance concerns
    were satisfied.
    Pr oj ec t Ar ea
    The street surface storage projects were conducted
    in the towns of Skokie and Wilmette, Illinois,
    suburbs of Chicago. The entire 8.6 square miles
    of Skokie and a 2-square-mile section of Wilmette
    Figure 1. Runoff temporarily stored on a street
    surface.
    are urban areas served by a CSS. Skokie has
    approximately 23,000 households (65 percent of
    which occupy single-family homes) and Wilmette
    has approximately 9,000.
    Pr oj ec t Desc r i pt i on
    To alleviate system surcharging, a strategy that
    combined the following elements was used:
    Street storage
    Downspout disconnection
    Flow regulators
    Subsurface storage
    New storm and combined sewer systems
    Improvements to existing storm and
    combined sewer systems
    The goal of the project was to take full advantage
    of the street and inlet system for stormwater
    control as an alternative to installing expensive
    underground facilities such as complex
    configurations of storage vaults with flow
    regulators or additional pipes for increased storm
    drainage capacity.
    The alternative street storage approach was based
    primarily on installing a system of street berms 7
    to 9 inches high at the curb line that detain water
    on the street surface. Figure 1 is a photograph
    that shows this technique. In addition, installing
    flow regulation devices at catch basin outlets
    reduced the rate of storm water flow to the CSS so
    both the inlet structure and the street can be used
    Street Storage for
    Combined Sewer Surcharge
    Berm Overflow
    ontrol
    kokie and Wilmette, Illinois
    C
    S









    Street Storage
    of Stormwater
    Longitudinal
    Street Profile
    Catch Basin
    Flow Regulator
    Berm
    Controlled
    Discharge to
    Combined
    Sewer System

    Figure 2. Schematic diagram of the street storage system (Note: not to scale and great vertical exaggeration).
    for storage. Figure 2 illustrates this concept.
    Subsurface storage facilities were installed in the
    street right-of-way and in other public areas as
    part of the storm drainage system at critical points
    in the system and in high-traffic areas, parking
    areas, and pedestrian walkways where ponding
    was not acceptable. Overall, street storage
    accounts for over half of the total stormwater
    storage capacity. The other half is accounted for
    in subsurface and off-street storage.
    Pr oj ec t Summar y and Benef i t s
    Many benefits were realized from this project.
    First, researchers estimate a cost advantage from
    using street storage over conventional sewer
    250
    200
    C
    o
    s
    t

    i
    n

    M
    i
    l
    l
    i
    o
    n

    $
    150
    100
    50
    0
    Sewer Separation Source Control

    separation systems to alleviate CSS surcharges.
    Figure 3 shows the estimated costs for the Skokie
    system to be approximately 38 percent of the
    costs for conventional approaches to sewer
    separation. A breakdown of costs associated with
    the street storage approach reveals that berm/flow
    regulator installation is a small fraction of the
    overall project cost, as shown in Figure 4. The
    street storage system could aid in traffic control
    because the berms function much like speed
    humps as traffic calming structures. Also, the
    storage system reduces the frequency and volume
    of combined sewer overflows, resulting in fewer
    stormwater-related pollutant events in receiving
    waters. Since the system's installation in 1983,
    80
    70
    C
    o
    s
    t

    i
    n

    M
    i
    l
    l
    i
    o
    n

    $
    60
    50
    40
    30
    Berms/Flow Regulators
    Sewers
    Supplemental Storage
    Figure 4. Costs associated with the CSS surcharge relief
    20
    10
    0
    Figure 3. Cost comparison between the traditional
    sewer separation approach and a source control
    approach using street surface storage. project.
    Street Storage for
    Combined Sewer Surcharge
    Control
    Skokie and Wilmette, Illinois













    consisting of 2,900 flow regulators, the Skokie
    Public Works Department has not reported any
    problems with icing of ponded areas during winter
    weather because the water typically remains on
    the street surface for less than 30 minutes.
    Several lessons were learned as a result of this
    project. First, researchers emphasized the
    importance of using a comprehensive approach to
    stormwater management that explores funding
    and cooperation from different sources, including
    streetscaping and revitalization programs.
    Second, early and frequent stakeholder
    involvement and strong outreach and education
    programs that clearly identify the benefits of street
    storage were necessary to gain support for the
    project from citizens. Finally, a comprehensive
    inspection and maintenance program with training
    for public works staff was essential to ensure that
    street storage systems functioned as designed.
    Ref er enc es
    USEPA. 2000. Street Storage System for Control
    of Combined Sewer Surcharge. EPA/600/R-
    00/065. U.S. Environmental Protection Agency,
    Washington, DC.
    Walesh, S., and R. Carr. 1999. Street Surface
    Storage for Control of Combined Sewer
    Surcharge. In WRPMD '99: Preparing for the
    21st Century, ed. M.E. Wilson. Proceedings of
    the 26th Annual Water Resources Planning and
    Management Conference, Tempe, Arizona, J une
    6-9, 1999.
    Cont ac t I nf or mat i on
    Stuart G. Walesh, PE
    Consultant
    3006 Towne Commons Drive
    Valparaiso, IN 46385-2979
    Phone: (219) 464-1704
    Fax: (219) 464-2978
    stuwalesh@aol.com
    Robert Carr
    Senior Water Resources Engineer
    Earth Tech
    1020 North Broadway, Suite 400
    Milwaukee, WI 53202
    Phone: (414) 225-5135
    Fax: (414) 225-5111
    bob_carr@earthtech.com

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