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Kinnickinnic River Flood Management and Watercourse Rehabilitation
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Kinnickinnic River Flood Management and Watercourse Rehabilitation

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Kinnickinnic River Flood Management and Watercourse Rehabilitation - Tom Sear, SEH …

Kinnickinnic River Flood Management and Watercourse Rehabilitation - Tom Sear, SEH

Nov 2010

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  • 1. Kinnickinnic River Flood Management and Watercourse RehabilitationAchieving Multiple Design Objectives Thomas R. Sear, PE, CFM Short Elliott Hendrickson Patrick C. Elliott, MMSD
  • 2. Kinnickinnic River (KKR) Watershed KKR S. 6th St. to I-94 Bridge Project Location
  • 3. Updated Floodplain (SEWRPC, 2008) 6th St Bridge
  • 4. KKR FM S. 6th St. to I-94 Bridge Project Area Characteristics• South 6th Street Bridge• Upstream Watercourse Segment – 500 feet of concrete lined channel – Confined cross-Sections – Steep northern embankment – MMSD CSO Facility on south• Downstream Watercourse Segment – 500 feet of earthen / rock lined channel – Eroded north embankment, south of 5th Street – Heavily vegetated north embankment – South embankment instability
  • 5. KKR FM Project Limits South 5th StreetBridge Downstream WC SegmentSouth 6th Street Kinnickinnic River
  • 6. KKR FM Project Limits South 5th Street BridgeSouth 6th Street Downstream WC Segment Kinnickinnic River
  • 7. KKR 6th St. Bridge – Upstream (West Side)
  • 8. KKR 6th St. Bridge – Downstream (East Side)
  • 9. KKR Upstream Watercourse Segment• Concrete Lined Channel – Constructed in 1983 – 500 ft. length, 2:1 side slopes – 60 ft top width, 24 ft bottom width• Northern Embankment – Buried (300 ft. long) WPA Wall – Railroad trestle remnants – Steep and unstable side slopes• Southern Embankment – Maintenance Ramp – MMSD CSO facility and outfall
  • 10. KKR Upstream Watercourse Segment Unstable Embankment End of with Sand and Concrete Gravel Fill Lined Material Channel MMSD KK1 Combined Facility Sewer Outfall Maintenance Ramp South 6th Street
  • 11. KKR Upstream Watercourse Segment Unstable Embankment with Sand and Gravel Fill Material MMSD CSO Control Facility Combined Sewer Outfall Maintenance Ramp
  • 12. KKR Upstream Watercourse Segment
  • 13. KKR Upstream Watercourse Segment
  • 14. KKR Downstream of South 6th Street Bridge June 7, 1961
  • 15. WPA Revetment Wall Buried in 1983
  • 16. Existing KKR Concrete Lined Channel Constructed 1983 WPA Wall Weep Hole Buried WPA Revetment Wall 84” Diameter RCP Storm Sewer Outfall Combined Sewer Outfall
  • 17. Existing KKR Concrete Lined Channel and Buried WPA Revetment Wall, 1983 Buried WPA Revetment Wall WPA Wall Weep Hole 18 feet 24 feet 18 feet Approx. 15 ft
  • 18. KKR Downstream Watercourse Segment• Earthen / Rock Lined Channel – 500 ft. length – Channel scour and deposition – Embankment erosion – Storm sewer outfalls• Northern Embankment – Failing Gabion Structure – Embankment erosion south of 5th Street – Vegetated riparian areas• Southern Embankment – Steep / unstable side slopes – Collapsing stone revetment walls – Exposed watercourse flushing pipeline
  • 19. KKR Downstream Watercourse Segment End of Concrete Lined Channel Eroded Side Slope due to 5th Street Runoff Failing Revetment Wall KKR Earthen / Rock Lined Channel Storm Sewer Storm Sewer Outfalls Outfall Exposed Abandoned Flushing Pipeline Steep and Unstable Side Slopes
  • 20. KKR Downstream Watercourse Segment Storm Sewer Eroded Side Slope due to Outfalls 5th Street Runoff Storm Sewer Outfall KKR Earthen / Rock Lined Channel Failing Revetment Wall Steep and Unstable Side Exposed Abandoned Slopes Flushing Pipeline
  • 21. KKR Downstream Watercourse Segment
  • 22. KKR Downstream Watercourse Segment
  • 23. Stakeholder Involvement• KK River Neighborhood Plan – Plan for overall KK River Flood Management Project – Coordination with local government agencies and community groups – Successfully accommodated various design requests from stakeholders• Public Meetings
  • 24. Proposed Improvements KKR S. 6th Street Bridge• Design Objectives – Significantly reduce upstream WSE’s – Maintenance / bike path beneath bridge• Proposed Design Features – Clear span concrete girder bridge – Functional, durable and attractive bridge• Final Design Complete – Currently Under Construction – Scheduled for Completion in Dec. 2010
  • 25. Proposed Bridge
  • 26. 11-02-10 Bridge Construction
  • 27. Proposed Improvements KKR Upstream Watercourse Segment• Design Objectives – Rehabilitated Main Channel – Maintain stable side slopes / hydraulic capacity – Maintenance / bike path alignment• Design Features – Realigned channel centerline – Stone lined channel with riffles and pools – Tiered retaining walls, both sides – Recycle WPA wall limestone blocks – 15 ft. wide maintenance / bike path
  • 28. Upstream KKR Improvements Minimum 2:1 Side Slopes Retaining Walls Future KKR Bike Trail
  • 29. Upstream KKR Cross-Sections
  • 30. Proposed ImprovementsKKR Downstream Watercourse Segment• Design Goals – Rehabilitated main channel and floodplain – Stable embankment slopes – Native vegetation plantings – Promote watercourse sediment continuity• Design Features – Stone lined channel with riffles and pools – 2:1 to 4:1 native vegetated side slopes – Reuse of limestone blocks / streambed stone – 15 ft. wide maintenance / bike path
  • 31. Downstream KKR ImprovementsRepair erosion Five Pools within from 5th St. Main Channel runoff 3:1 Side Slope, where space allows Future KKR Bike Path
  • 32. KKR Downstream Cross-Section Typical Riffle Section
  • 33. KKR Main Channel Cross-Sections Typical Pool Section
  • 34. KKR Watercourse Rehabilitation Improvements Schedule• Advertisement – May 2010• Construction Start – Oct. 2010• Construction Completion – Dec. 2011• Upstream Improvements – Finishing Preliminary Engineering – Starting Home Acquisition/Deconstruction
  • 35. Kinnickinnic River Project Team Acknowledgements• Dale Miller, Mainstream Restoration• Rose Chmielewski, Ecological Services of Milwaukee• Doug Bath, Gestra Engineering