City of Ann Arbor Sanitary Sewer Overflow _SSO_ Prevention by yaofenji


        City of Ann Arbor                       • Introductions
 Sanitary Sewer Overflow (SSO)                  • Task Force Mission
                                                    – Community Feedback
 Prevention Advisory Task Force
                                                • History and Issues
Co-Chairs:                                      • Study Overview
Sumedh Bahl, P.E.                                   – Your Thoughts/Suggestions
Stephen Rapundalo

           SSO Task Force:                                 Task Force Membership
             What Is It?                        •   Sumedh Bahl, P.E. (Interim City Utilities Director) ð Co-Chair
                                                •   Jane Book (Bromley)
• Proposed in March, 1999 by neighborhood       •   Ben Bouchard (Dartmoor)
                                                •   Barb Bruemmer (Glen Leven/Woodland)
  groups and residents relative to concerns     •   Craig Hupy, P.E. (City Water Utilities Field Division)
  over the August 1998 sewage backup event.     •   Jim Nieters (Morehead)
                                                •   Ron Olson (Associate City Administrator)
• Approved in July, 1999 by Mayor/Council.      •   Pete Perala, P.E. (City Water Utilities Field Division) ð Project Manager
                                                •   Stephen Rapundalo (Orchard Hills-Maplewood) ð Co-Chair
• 15-member committee representing City         •   Lee Roberts (Professional Plumber)
                                                •   Laura Rubin (Huron River Watershed Council)
  Utilities Staff, City Administration,         •   Bill Wheeler, P.E. (City Public Services)
  neighborhood residents, engineering           •   Dennis Wojcik, P.E. (Washtenaw Co. Drain Commissioner’s Office)
                                                •   Prof. Steve Wright, Ph.D. (Michigan College of Engineering)
  professional, Huron River Watershed           •   Sabah Yousif, P.E. (City Public Services)
  Council, Drain Commissioner.

         Task Force Mission                           Task Force Key Objectives
 • Define the scope of sanitary sewer           • Identify critical sewage backup issues.
   overflow or sewage “backup” problems
                                                • Design and implement a comprehensive
   due to wet weather conditions in the City
                                                  sewage “backup” prevention engineering
   of Ann Arbor, and identify possible
   effective solutions to eliminate or reduce
   the impact of future sewage “backup”         • Engage the community throughout process.
   events through a comprehensive study         • Identify solutions and make
   process.                                       recommendations to Mayor/City Council
                                                  and homeowners.

     Task Force Opportunities                            Task Force Challenges
• Chance to remedy a recurring health and
  safety problem for homeowners                  • Identify effective solutions to remedy
                                                   chronic backup problems
• Build positive relationships between
  residents, Water Utilities Department, and     • Reach consensus on reasonable costs for
  City leaders                                     any recommended solutions
• Demonstrate that Water Utilities Department    • Recruit current “non-affected” residents to
  is service-oriented                              be part of the process and helpful as needed
• Process of public involvement could serve as   • Overcome past negative attitudes and
  model for other citizens-based participation     cynicism

    Why Are We Here Today?                         Introduction and Information?
• Help public understand the SSO work            • Name
• Build connections between Task Force and       • Key information that would be helpful to you.
  the community
• Get clear about history of the issue
• Set the stage for good solutions

          Where Are You?                                           Feedback
                                                 • Key Issues

     Flooding History and Primary
                                                            Definition of Terms
               Causes                                    O Sanitary sewers
                                                         O Storm runoff/storm sewers
•   What type of problems exist?
                                                         O Wet weather flow
•   Where have these problems taken place?               O Inflow & Infiltration (I/I)
•   When have these occurred?                            O Sanitary Sewer Overflow (SSO)
                                                         O Basement backup (floor drains)
•   Who is impacted?
•   Why is this important?
•   Can it be fixed?
•   What steps are being taken?

               Causes of
                                                        Flooding History
           Basement Flooding
• Poor stormwater drainage around the home   • Basement flooding storms
  (water entering through the windows or       – 1964, 1967, 1968, 1969, 1975, 1976, 1982,
  walls)                                         1998
• Failed sump pump                           • August 1998 - Nearly 200 homes had
• Blockage in home sewer lead                  basement flooding
• Overloaded sanitary sewer (coming up       • Of the 200 affected homes, 55% were in the
  through the floor drain)                     5 neighborhoods

    August 1998 Reported Flooding
                                                        Southwest Areas

            Northeast Areas              Sanitary Sewer Overloading
                                      • Inflow
                                         –   Footing drain connections
                                         –   Area and other drains
                                         –   Connected downspout connections
                                         –   Submerged manhole covers
                                      • Infiltration
                                         – Leaking pipe joints
                                         – Pipe breaks
                                         – Leaking manhole walls

Field Program Builds the Project              Causes Must be Identified
• Identify problems
  – Basement flooding
  – Discharges to streams and river
• Determine causes of problems
  – Manhole and pipe defects
  – I/I sources
                                                                          Sanitary Collection
  – Low basement elevations                                               System

                                       Where Will Most of the Work
 Problems Impact the Residents
                                              Take Place?

               Study Includes the        Public Engagement For Two-
                Following Items             Way Communication
•    Engaging the public                • Continuous
•    Gathering historical information
                                        • Public workshops
•    Monitoring flow/depth/rain
                                        • Homeowner
•    Inspecting manhole/sewers
•    Modeling sewers
                                        • Monthly meetings
•    Reviewing alternative solutions      with SSO Task
•    Making recommendations               Force

Historical Data Helps Understand             Field Work is Primarily
            the Causes                             in the Street
    • Past studies - findings
      and recommendations
    • Inspection efforts
    • Peer community
      response policies and
      corrective actions
    • Review costs/benefits
      of past projects

     Monitoring Flow Needed
                                        Monitoring Rainfall Needed to
    to Understand Sewer Flows
                                               Understand I/I
      Flow monitors at problem                  Rain gages will be
          area discharges                    located in each area to
                                                 measure rainfall

 Manhole Inspection Needed to                                Smoke Testing Needed to Locate
      Identify Defects                                            Specific I/I Sources
  Inspection will identify
      local problems

                                                                    Smoke and dye
                                   Sewer connections will
                                                                    testing to locate
                                   be field verified where
                                                                    significant impacts

  Sewer TV Work Can Identify                                     When Will This Work Take
         Rehab Needs                                                      Place?
                                                             • Flow/Rain/Level Monitoring (March -
                                                             • Homeowner/Elevation Survey Work
                                                               (April - June)
                                                             • Manhole Inspection (May - June)
                                                             • Smoke/Dye Testing/TV Work (June -
                               Sewer TV work will
                             guide corrective actions

                                                             Survey Gives Data on the Extent
  Public Involvement Schedule
                                                                    of the Problem(s)
• Workshop 2 - Extent of problem and
  feedback on range of solutions (July)                      • Who has had basement flooding?
• Workshop 3 - Primary causes and feedback                   • What caused the flooding?
  on range of costs (October)                                • How frequently has it taken place?
• Workshop 4 - Recommended program cost                      • What conditions vary between houses?
  and schedule (January)                                     • What have homeowners done to protect
                                                               their property?
                                                             • What I/I sources exist and how removable
                                                               are they?

     What We Need From You                                    Table Check In
• Take and fill out survey                       • Any clarification needed?
  completely (We need                            • Additions to the challenges and
  your address!)                                   opportunities of Task Force?
• Please mail back to us                         • Important additions to the history of the
• Take surveys and                                 problem?
  distribute to your                             • Requests of the Task Force?
  neighbors (Please ask
  them to mail these in)

        Staying Connected/
                                                                Thank You!
        Getting Help/Thanks
 • How to contact the task force
                                                 • Discussion
 • How you can help
   – Homeowner survey
   – Raising homeowner
     understanding of the issues
 • How to stay informed
   – Newsletters
   – Phone - (734) 651-7676
   – Web site -


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