excellence in engineering since 1946 · strand associates, inc.® ( ) complex sewer separation in a...

Excellence in Engineering Since 1946

Strand Associates, Inc.® ( )

Complex Sewer Separation in a Tight Urban Corridor: The Challenges of The Valley Conveyance System

OWEA Collection Systems Workshop

May 2, 2017

Mike Ellerbrock, P.E., LEED-AP

Outline

Image courtesy of Human Nature

Outline

• Project Background

• Challenges

• Space Constraints

• Existing Sewer

• Developing Details

• Conclusion and Questions

Image courtesy of Human Nature

Background - Lick Run History

• Watershed Developed, Redeveloped, Redeveloped…

• 31 miles streams 4 miles streams + 350 miles sewer

• Lick Run Combined Sewer Built in 1890s

• “Lickrun Sewer… A Big Affair That Will Help One End of the City.”

• “One of the Largest Drains in the United States”

• CSO 005

• Largest Annual Overflow Volume

• Consent Decree, WWIP

• Original LMCPR

• LMC Study

• Deep Tunnel

• Alternate Solution Possible

Background – Development Effects

• Infrastructure Investment

• Multiple objectives

• Revised Original LMCPR

• Stormwater separation

• Lick Run Strategic Separation

• 12 Projects

Background – Communities of the Future

Valley Conveyance System Overview

Rendering courtesy of Human Nature

Challenge – Limited Horizontal Space

Images courtesy of Human Nature

Challenge – Limited Horizontal Space

• Hybrid Conveyance

Image courtesy of Human Nature

Challenge – Limited Horizontal Space

Rendering courtesy of Human Nature

Challenge – Limited Horizontal Space

Challenge – Limited Vertical Space

Challenge – Limited Vertical Space

Challenge – Limited Vertical Space

476.00

477.00

478.00

54 60 66 72 78 84

Ele

va

tio

n

Nominal Pipe Diameter (IN)

Proposed CS Crown Elevation at VCS Crossing- Engel Alley

Crown Elevation

Challenge – Limited Vertical Space

Recurring Challenge – Existing Combined Sewer

Recurring Challenge – Existing Combined Sewer

Recurring Challenge – Existing Combined Sewer

Recurring Challenge – Existing Combined Sewer

Recurring Challenge – Existing Combined Sewer

Recurring Challenge – Existing Combined Sewer

Recurring Challenge – Existing Combined Sewer

Developing Details

• Water Quality

Image courtesy of Human Nature

Developing Details

• Water Quality

Image courtesy of Human Nature

Developing Details

• Water Quality

Image courtesy of Human Nature

Developing Details

• Water Quality

Developing Details

• Brick Sewer Connections

Developing Details

• Coordination with Separation Projects

Developing Details

• Coordination with

Utilities

• GCWW Water Mains

• Duke GasQueen City Avenue

30” Water

Main

36” Water

Main

Developing Details

• Coordination with

Utilities

• Duke Electric*

• Time Warner Cable*

• Cincinnati Bell*

• City ETS (fiber)*

• *conduit by MSD

contractor

Other Challenges

• Transportation Crossings

• Major 1-way pair with cross streets

• Railroad

• Soils

• Structural Considerations (fill, slopes)

• Impacted Soils

• Volume

• Maintenance Access

Concluding Remarks

• Challenges are abundant, but can be overcome with

detailed design

• Record Locations of infrastructure should be investigated

• CSO control infrastructure can positively impact

communities

Strand Associates, Inc.® ( )

QUESTIONS?

Mike Ellerbrock, P.E., LEED-AP513.861.5600

mike.ellerbrock@strand.com

Excellence in Engineering Since 1946