us army corps of engineers building strong ® repairing the mississippi river levee with dredged...
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BUILDING STRONG ® Fuse Plug LeveeTRANSCRIPT
US Army Corps of EngineersBUILDING STRONG®
Repairing the Mississippi River Levee with Dredged Material after the Historic 2011 Flood
Dredging 2012
Shane Callahan, P.E.
Michael Clay, P.E.Memphis DistrictOctober 24, 2012
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Birds Point – New Madrid Floodway
• 33 miles long• 10 miles wide• 205 sq. mi.
Inflow # 1
Inflow/Outflow # 1
Inflow/Outflow # 2
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Fuse Plug Levee
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Birds Point – New Madrid Floodway
Constructed in 1928 in response to the flooding experienced in 1927.
Activated only once before 2011 – 1937
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0
62.5 – Project Design Flood EL. 333.0
EL. 270.5
60.0 – 100 Yr Event
58.5 – 50 Yr Event329.0
330.5
56.0 – 25 Yr Event326.5
52.3 – 10 Yr Event322.8
49.3 – 5 Yr Event319.8
Flood of Record1937 – 59.5’
1997 – 56.2’ > 1973 (55.7)
2008 – 53.9’
Cairo Gage
2002 – 55.0’
2005 – 53.2’
2011 Flood61.72’
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Floodway Activation
Video of Detonation:► http://www.youtube.com/watch?v=RfIII1Fovqc&feature=relmfu
Video of Flow filling Floodway► http://www.youtube.com/watch?v=Xz3LIeBhkYs
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Less Powerful Blasting Agent
Lack of Broad overflow
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Concentrated Flow
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Scour Hole Formation 12.5 acre, 50’
deep scour hole
Over 450,000 CY of displaced material
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Floodway Activation
Side by side comparison of aerial photography before activation and soon/directly after activation
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Repairing the Levee
Sand and sediment surrounding the area were pushed into scour hole – too slow
A faster approach to filling the scour hole was required
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Dredging Proposed
Dredge Iowa►Hull length = 194 ft►Hull width = 32►Ladder = 76 ft►Cutter Brake H.P. =
300 HP Average Dredge
Fill Rate: 20,000 CY/day
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Environmental Complication
Protect Fill
Separate
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Environmental Complication Blue Hole contamination Original containment proposal involved
a rock/rip-rap dike►$2 million +►3 months or more►Potentially ineffective sediment
containment system
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Environmental Solution
Sediment Curtain►2 week lead time►3 day installation time►Approx. $50,000►Virtually impenetrable to sedimentBlue Hole Scour Hole
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Sediment Curtain Install
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Begin Dredged Fill
Dredge
Blue Hole
Dredged Fill
Area to be Filled
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Begin Dredged FillBlue Hole
Dredged Fill
Area to be Filled
Incoming Slurry Pumped
Drain
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Dredged Fill
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?QUESTIONS?