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
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
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.
• 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?
• Poor stormwater drainage around the home • Basement flooding storms
(water entering through the windows or – 1964, 1967, 1968, 1969, 1975, 1976, 1982,
• 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
Northeast Areas Sanitary Sewer Overloading
– Footing drain connections
– Area and other drains
– Connected downspout connections
– Submerged manhole covers
– 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
– Low basement elevations System
Where Will Most of the Work
Problems Impact the Residents
Study Includes the Public Engagement For Two-
Following Items Way Communication
• Engaging the public • Continuous
• Gathering historical information
• Public workshops
• Monitoring flow/depth/rain
• 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
• Inspection efforts
• Peer community
response policies and
• Review costs/benefits
of past projects
Monitoring Flow Needed
Monitoring Rainfall Needed to
to Understand Sewer Flows
Flow monitors at problem Rain gages will be
area discharges located in each area to
Manhole Inspection Needed to Smoke Testing Needed to Locate
Identify Defects Specific I/I Sources
Inspection will identify
Smoke and dye
Sewer connections will
testing to locate
be field verified where
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
• What I/I sources exist and how removable
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)
• How to contact the task force
• How you can help
– Homeowner survey
– Raising homeowner
understanding of the issues
• How to stay informed
– Phone - (734) 651-7676
– Web site - http://www.cdm-mich.com/aa-sso