Upload
wafscm
View
1.167
Download
0
Embed Size (px)
DESCRIPTION
Kinnickinnic River Flood Management and Watercourse Rehabilitation - Tom Sear, SEHNov 2010
Citation preview
Kinnickinnic River Flood Management and
Watercourse RehabilitationAchieving Multiple Design Objectives
Thomas R. Sear, PE, CFMShort Elliott Hendrickson
Patrick C. Elliott, MMSD
Kinnickinnic River (KKR) Watershed
KKR S. 6th St. to I-94 Bridge
Project Location
Updated Floodplain(SEWRPC, 2008)
6th St Bridge
KKR FM S. 6th St. to I-94 BridgeProject 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
KKR FM Project Limits
Downstream WC Segment
Sout
h 6t
hSt
reet
Kinnickinnic River
Sout
h 5t
h St
reet
Brid
ge
KKR FM Project Limits
Downstream WC Segment
Sout
h 6t
hSt
reet
Kinnickinnic River
Sout
h 5t
h St
reet
Brid
ge
KKR 6th St. Bridge – Upstream (West Side)
KKR 6th St. Bridge – Downstream (East Side)
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
KKR Upstream Watercourse Segment
MMSD KK1 FacilityCombined
Sewer Outfall
Maintenance Ramp
South 6th Street
Unstable Embankment with Sand and
Gravel Fill Material
End of Concrete
Lined Channel
KKR Upstream Watercourse Segment
MMSD CSO Control Facility
Combined Sewer OutfallMaintenance
Ramp
Unstable Embankment with Sand and
Gravel Fill Material
KKR Upstream Watercourse Segment
KKR Upstream Watercourse Segment
KKR Downstream of South 6th Street BridgeJune 7, 1961
WPA Revetment Wall Buried in 1983
Existing KKR Concrete Lined ChannelConstructed 1983
Buried WPA Revetment
Wall
WPA Wall Weep Hole
Combined Sewer Outfall
84” Diameter RCP Storm
Sewer Outfall
Existing KKR Concrete Lined Channel and Buried WPA Revetment Wall, 1983
Buried WPA Revetment
Wall
Approx. 15 ft
WPA Wall Weep Hole
24 feet18 feet 18 feet
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
KKR Downstream Watercourse Segment
KKR Earthen / Rock Lined Channel
Steep and Unstable Side
Slopes
Eroded Side Slope due to 5th Street Runoff
Failing Revetment Wall
End of Concrete Lined Channel
Storm Sewer Outfalls
Storm Sewer Outfall
Exposed Abandoned Flushing Pipeline
KKR Downstream Watercourse Segment
Steep and Unstable Side
Slopes
Eroded Side Slope due to 5th Street Runoff
Failing Revetment Wall
Storm Sewer Outfalls
Storm Sewer Outfall
Exposed Abandoned Flushing Pipeline
KKR Earthen / Rock Lined Channel
KKR Downstream Watercourse Segment
KKR Downstream Watercourse Segment
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
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
Proposed Bridge
11-02-10 Bridge Construction
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
Upstream KKR Improvements
Minimum 2:1 Side Slopes
Future KKR Bike Trail
Retaining Walls
Upstream KKR Cross-Sections
Proposed Improvements KKR 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
Downstream KKR Improvements
Future KKR Bike Path
3:1 Side Slope, where space
allows
Five Pools within Main Channel
Repair erosion from 5th St.
runoff
KKR Downstream Cross-Section
Typical Riffle Section
KKR Main Channel Cross-Sections
Typical Pool Section
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
Kinnickinnic River Project Team Acknowledgements
• Dale Miller, Mainstream Restoration
• Rose Chmielewski, Ecological Services of Milwaukee
• Doug Bath, Gestra Engineering