Breach Control Resiliency Opportunity

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Breach Control / Resiliency Opportunity Policy

• Matthew Hunn, P.E.
• Corps of Engineers
• St. Louis District

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Situation

• Result of IPET and Hurricane Katrina
• I-Wall and Levee Design Review
• Hardening of Back Slopes
• Drain Structures / Pumps
• Policy Provided To Evaluate Place Resilient
  Features During The 2008 Flood Recovery
• Potential for future applications
• No Increase in Level Or Area of Protection
• Placement Where History of Damages
• Protected Side Only

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Intent

• Reduce Overall Damages
• Reduce Recovery Time
• 18 months plus 2008
• Reduce Long-Term Costs
• Levee Repair Costs Increased 2 to 3 X 08 to Pres
• Plan / Decision Effort Belongs To Sponsor
• Make Policy Flexible
• Allow SOME Funding Effort On These Alternatives

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6/27/2008 4am The Levee breached.
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Definition

• Resiliency Ability to Withstand Overtopping
  Event / Scour Protection
• Breach Control Identify Low Sections for
  Overtopping or Back Flooding Systems
• Intentional Breach
• Drains Opened
• Construct Low Spot / Weir

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Current PL84-99 Policy

• Betterments 100 Sponsor Cost
• Related to the basic rehabilitation project
• Sponsors Decision / Implement during rehab
  effort
• "Betterment" costs are not included in the rehab
  economic justification and BCR, so their
  increased cost paid for by the sponsor would not
  reduce the BCR
• Allows Deliberate Breaches / Back Flooding
• Coordination with COE (3 STL / 1 Rock Isl)
• Sponsors Cost
• Repairs are Eligible for Assistance at Cost Share
• Federal Systems 100 Fed Cost
• Non-Federal Systems 80 Fed / 20 Sponsor

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Viable Alternatives??

• Armor Back Slopes of Levees
• Degrade section / Overflow Weir
• Oversize Drains to Flood Un-Water
• Vegetation Drain Maintenance
• No Sandbagging Low Section
• Sponsor OM Responsibility
• Backflood Systems
• Open Drain Structures / Reverse Pumps
• Scour Protection On Interior And Exterior
• Overtopping / Low Reach (Weir)
• Raise Pump Stations / Structures

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Scour
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USACE Policy Changes

• Allow Flexibility in Spending / Funding Repairs
• Initial Costs NOT included in favorable B/C
• Modify Sponsor OM Agreement
• Encourage Planning / Communicate Risk
• In ALL Cases Sponsors Decision!

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FEMA Considerations

• Debris
• Pumping Cost Reimbursement
• Flood Hazard Mitigation Planning
• Long-Term Recovery Incentives

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State Considerations

• Flood Hazard Mitigation Planning, Planning,
  Planning . . . More Planning???
• Encourage Mitigation Efforts
• Buyouts
• Long-Term Recovery Actions

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Where do we go from here?
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Cultural Change??

• Flood Fighting To Raise or Not To . . .
• Allow Levee Systems To Back-flood
• Designed with less freeboard on downstream end
• No raising of weir / low spot
• Plan to Flood
• Evaluate
• Building Codes e.g. coastal flooding areas /
  flood vents
• Move critical elements / infrastructure above
  Systems Level of Protection (Base Flood?)

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In All Cases . . .

• Communicate Risk Better
• Involve Communities / EAPs

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• Questions Or Comments?
• Email Matthew.Hunn_at_us.army.mil
• 314-346-9563