Green Infrastructure in CSO Long Term Control Planning

1
Green Infrastructure in CSO Long Term Control
Planning

• Marty Umberg - MSD Greater Cincinnati
• NACWA/Wet Weather Partnership Meeting
• April 17, 2008

2
MSG Greater Cincinnati CSO Long Term Control
Program

• Wet Weather Program includes CSOs, CAPP, water
  in basement, and other wet weather issues.
• Wet Weather Program Submitted June, 2006 in
  accordance with Consent Decree.
• Affordability is a major issue.
• Green Infrastructure is now considered part of
  the solution.

3
Green Infrastructure is planned as a 3-Tier
Program in the LTCP

• Tier 1 Approximately 5 full scale Pilot
  Projects which will provide tools and
  experience for the Department to use as more
  Green Infrastructure Projects are planned and
  implemented. 
• Tier 2 Every Gray Project will be evaluated
  within the LTCP at the Bundle or Project level of
  implementation for opportunities to include Green
  Infrastructure in combination with Gray or to
  eliminate the need for Gray Projects.  Green
  infrastructure will be evaluated versus Gray
  Infrastructure on a cost basis acknowledging
  that sometimes a Green solution may provide
  additional benefits to Gray.
• Tier 3 System-wide Green Infrastructure Program
  Measures will include system wide education and
  development of Green Program regulations,
  policies. and practices.

4
CSO Long Term Control Program

• 212 CSOs
• Most solutions are high rate treatment, storage
  projects, or combined sewer separation.
• CSO clusters reviewed for opportunity to
  eliminate small storage requirements within a
  cluster.

5
Green Potential ?

• Each area has its own potential to implement
  Green features
• Is there active redevelopment and investment?
• Is the area established, mature and stable?
• Is the community/city/town supportive?
• A combination of factors affect potential, near
  and long term.
• Worked with local agencies/parties to
  characterize the potential in the CSO and
  surrounding areas.

6
Example Lower Duck Cluster

• 2.0 MG of storage and consolidation pipe to
  provide 85 control for CSOs 84 and 503.
• Green review identified gt100 acres of open space
  in the area and the potential to control/manage
  stormwater.

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Lower Duck Cluster CSOs 84 503
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Lower Duck Cluster CSOs 503
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Lower Duck Cluster CSOs 503
CSO 503
All surface drainage intercepted via drop boxes
OPEN SPACE
OPEN SPACE
STORM SYSTEM
Eliminates the need for storage!
STORM SYSTEM
10
Lower Duck Cluster

• 10.7 million storage and consolidation replaced
  by 5.1 million stream restoration, pipe rehab
  program.
• Green Pilot Program in CSO 84 and 503 service
  area.
• Level of control anticipated to be greater than
  85 with Green Program.

11
Example Upper Mill Creek

• Two small storage facilities identified
• CSO 226 - 0.40 MG
• CSO 559 0.15 MG
• Combined cost of 6.0 million
• CSO 559 identified as a Community Priority (90
  target controls) it discharges into a stream
  reach where restoration has occurred.
• Can the storage be eliminated by implementing
  Green program features?

12
West Branch Mill Creek CSOs 226 559
CSO 559
Open Space Opportunity
Redevelopment Opportunity
CSO 226
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Upper Mill Creek - 559

• Near term Green opportunities identified in CSO
  559 area equivalent to 0.25 MG of green
  storage.
• This is greater than the 0.15 MG necessary to
  achieve 90 control.
• Storage facility eliminated in lieu of Green.

14
Upper Mill Creek - 226

• Near term Green opportunities identified in CSO
  226 area equivalent to 0.025 MG of green
  storage.
• Not enough near term potential Long term
  potential of 0.23 MG combined with increasing
  interception capacity will attain target control
  level of 85.
• Storage facility eliminated in lieu of Green and
  Regulator adjustment.

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Green Infrastructure in CSO LTCP

• Opportunities to reduce or eliminate some
  proposed Gray projects especially small storage
  tanks
• Provides improved level of control and water
  quality in areas that will not be addressed by
  gray projects for some time.
• Tools, including methods, costs, and policies,
  will be developed in time and will ultimately
  determine the Green Program.