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    Union Sanitary District’s Collection System Hydraulic Model and Pipe Condition Assessment Program

    – the ongoing evolution of a powerful planning tool

    Rollie Arbolante – Union Sanitary DistrictJennifer Chang & Gisa Ju – Woodard & Curran

    PUG 2018 Sharing Technologies SeminarThursday, February 22, 2018

  • Union Sanitary District800+ miles of sewer22 mgd ADWF (current)57 mgd PWWF (current)73 mgd PWWF (future)

  • Early Planning Efforts1989 Sewer Master Plan

    ➢ Collection system-wide➢ Flow projections and hydraulic model➢ Recommended capacity projects and 6-year cycle

    of CCTV inspection1993 District-wide Master Plan

    ➢ Transport & Treatment Systems➢ Refined design flow projections

    These studies set the stage for an on-going master planning process

  • Master Planning Process

    Capacity Deficiencies

    Design Conditions

    Flow Meter Data

    Land Use Data

    Rehabilitation Needs

    Cost Data

    Inspection Data

    O&M Data

    Condition AssessmentCapacity Assessment

    Recommended CIP

    Hydraulic Model

    Database ProgramAlternative

    Analysis & Prioritization

  • Capacity Assessment Methodology

    Build Network• Asset data• Operation data• Land Use data

    Calibrate Model• Flow meter data• Rain gauge data• SCADA data

    Assess Capacity• Future conditions• Design storm• Deficiency criteria

    Develop Projects• Capacity improvement• Capital costs• Priorities

  • Hydraulic Model Simulates System Performance

  • USD Hydraulic Model Evolution – Model SoftwareSNAP Model (Static) HydroWorks™ (Fully Dynamic)

    InfoWorks™ (GIS interface) InfoWorks ICM™

    1989 201820171999 2004

    •Static•Non-graphical•No hydraulic gradeline•No user interface

    •Fully dynamic•Powerful GIS interface•Vast capabilities

  • USD Hydraulic Model Evolution – Model NetworkMost

    10-inch sewersGradual


    “subareas” All Pipe Network

    1989 201820172000

  • USD Hydraulic Model Evolution – Land Use DataDigitized AutoCad map +

    aerial photo overlays + ArcGIS Mapping + Customer Billing Databases

    1995 201820042000

    Customer Billing Database• Address and APN• Land Use Type (CIXZ)• Residence Type• Vacant or Not Served• Volume Per Year Usage

  • USD Hydraulic Model Evolution – Design FlowsPeaking factors, conservative I/I

    rates Less conservative RDI/I assumptions

    Design storm update, calibrated

    RDI/IRDI/I sensitivity

    studied“Calibrated” vs. “Design” BWF

    Design storm update

    1989 201820152000 2008 20121997

  • Hydraulic Model Planned Future EnhancementsAll-pipe model

    ▪ Increases detail and accuracy of flow routing

    ▪ Facilitates development reviews

    ▪ Confirms capacity needs for rehabilitation projects

  • Condition Assessment Methdology

  • Condition Rating Based on CCTV Data▪ Values defined by District staff▪ Structural, maintenance, and total


    ▪ Minimum “default” rating for sewers on 3 to 36-mo. maintenance frequency

  • Critical Rating Establishes Priorities

    Critical Rating = Condition Ratingx Total IF

    Impact factors reflect consequence of failure

    Critical Rating reflects total risk

    (Value from 1 to 2)

  • Structural Rehabilitation Methods Considered ▪ Full-segment replacement▪ Full-segment lining▪ Spot repair of severe defects▪ Spot repair of moderate and severe defects

  • “Best” Method Based on Lowest Annual Cost of OwnershipCost of ownership also considers maintenance cost over remaining life of pipe

    ➢ Replacement – 100-year life @ 72-mo. maintenance frequency➢ Lining – 75-year life @ 72-mo. maintenance frequency➢ Spot Repair – remaining life based on current pipe age and number

    of unrepaired defects @ current maintenance frequency

  • Pipe Condition Assessment Program EvolutionPCAP


    Changes to CCTV codes, Hansen updates, new manhole numbering

    system, GIS, localized liner spot repair

    “Annual cost of ownership”



    InfoMaster™1995 20182012

  • Powerful Planning Tools Facilitate Great Results

    Address capacity deficiencies

    1995 – Multiple deficiencies2017 – No capacity projects

    Optimize rehabilitation

    Lifecycle cost methodInfoMaster™ benefits

    Increase confidence

    Reduce assumptionsImprove resolutionApply elsewhere

  • In Conclusion▪ Through cyclic Master Plan updates, the District’s hydraulic model and

    condition assessment methodology have continually improved in detail and usefulness

    ▪ Master Plans ensure timely identification of capital needs▪ USD serves as an excellent example of leveraging effective

    planning tools in a systematic approach to quality public stewardship

  • Acknowledging 20+ Years of EffortDISTRICT STAFF

    Andy Morrison (retired)Bernie Graef (retired)

    Chris ElliotCurtis Bosick

    Dan Tolvtvar (retired)Dwight Dorsey (retired)

    James SchofieldJeff Roletto (retired)Jesse Gill (retired)

    Manuel Terra (retired)Matt Faria (retired)

    Mohammad GhouryPaulette Roberson

    Raymond ChauRich Czapkay

    Richard Currie (retired)Richard ScobeeRollie Arbolante

    Russell Wogerman (deceased)Sami GhossainShawn Nesgis

    Susan Whitelock (retired)Todd Jacob

    Consultants and Subconsultants: Woodard & Curran (RMC), MWH, Talavera & Richardson, E2, V&A, ADS, and Total Flow



    Contact informationRollie Arbolante (USD)

    [email protected]

    Gisa Ju (Woodard & Curran)[email protected]

    Jennifer Chang (Woodard & Curran)[email protected]

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