First presented at the Fort Wayne Technical Seminar on Sept. 28,
2010 by Brian Desharnais, Ph.D., P.E. of Commonwealth Engineers,
Inc.
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Presentation Agenda
- What is Green Infrastructure?
- Indianapolis - Pogues Run Sewer Separation and Drainage Project
- Recap of Challenges & Advice
What is Green Infrastructure?
Infrastructure that improves water quality of storm water using
natural methods, such as native plants, or engineered methods.
Common examples:
What is Green Infrastructure?
Additional examples:
What is Green Infrastructure?
Additional examples:
Indianapolis - Pogues Run Sewer Separation and Drainage
Project
The Problems - Water entering Pogues Run is polluted from:
- Overflows from combined sewage
- Stormwater runoff
The Solutions - Drainage Improvements and Sewer Separation
- Area 2: Install new storm sewers and bio-swales with
underdrains
- Area 3: Install new storm sewer to Brookside Creek
- Area 4: Install new storm sewer to Pogues Run Art and Nature
Park
- Area 5: Install new storm sewer along 21st Street and vegetated
basin/bioretention
Indianapolis - Pogues Run Project Area
Project Benefits
- Reduce raw sewage overflows into Pogues Run at Combined Sewer
Outfall (CSO) 143
- Meets Consent Decree requirements
- Reduce flooding in streets, yards, basements and garages
- Improve the quality of stormwater discharged into Pogues Run
through green infrastructure
- Create more natural infiltration of and pollution removal from
stormwater
Area 2
Perspective View of Bio-Swales
Section / Elevation View of Bio-Swales
Engineered Soil Amendments
Area 5
Area 5 - Plan View
Area 5 - Typical Section
Perspective View of Vegetated Basin
Section / Elevation View of Vegetated Basin
Proposed Native Plant Material
Recap of Challenges
- Inadequate stormwater system
- Active urban community, very little open space
- City has little experience operating and maintaining green
infrastructure
- Soil permeability test 10-6 to 10-8 cm/sec
- Custom solutions - outside the box
- Encroachment into right of way
- Easements
- Conflicting utilities
Planning Advice
- Determine who is going to maintain green infrastructure
- Measure soil permeabilities in project area
- Properly locate utilities in project area
- Do not remove established trees unless absolutely
necessary
- If land is needed, determine if permanent easement or land
acquisition is desired
- Consider selecting a visible location for project if
possible
Planning Advice
- Perform a cost comparison between green and gray including long
term maintenance
- Get public involved in early stages and provide education
- Consider impacts to neighborhoods (i.e. mailboxes / walkways /
driveways / snow plows / bus stops)
- Consider future plans of adjacent roads
- Select durable materials especially for underdrains and
overflows
- Measure water quality before and after construction
- Include multi-year maintenance and city/town training into
construction contract
