PIANC Conference 2008 Coastal Flood Risk Management Analysis for the Mississippi Coastal...

PIANC Conference2008

Coastal Flood Risk Management Analysis for the Mississippi

Coastal Improvements Program

By Jeremy M. LaDart&

Dennis MekkersUS Army Corps of Engineers, Mobile District

Mississippi Coastal Improvements

Program• $10 Million Emergency

Supplemental Appropriations(P.L. 109-359) 30 December 2005

• Cost Effective Projects in lieu of NED benefits

• No Incremental Benefit-Cost Analysis

• 6 month interim and 24 month comprehensive report requirements

• Hurricane and Storm Damage Reduction

• Salt Water Intrusion• Shoreline Erosion• Fish and Wildlife Preservation• Other Water Related Resource

Projects

Studies related to the consequences of the

2005 hurricanes

* All efforts fully coordinated with the Louisiana Coastal Protection and Restoration

Project (LACPR) team

Coastal Mississippi

Coastal Mississippi

H. Katrina Surge

Planning Sub-units

Planning Process

Surge Probability

Storm Tracks

Modeling Approach

These storms were developed viaa methodology that is similar to theJoint Probability Method – but retain the ability to be checked againstcharacteristics of real storms over at

leastpart of the range considered.

Surge ProbabilityHancock County

Structure Database

• Over 200,000 Parcels

• 800 – 11X17 Parcel Maps

• Over 3,000 man-hours

Structure Database (Cont.)

First Floor Elevation Structure and Content Values Katrina Damage Number of Stories Construction Type Occupancy Type

Coastal Flood Risk(HEC-FDA)

Sta

ge

Probability

Stage

Dam

ag

e

ProbabilityD

am

ag

e

Lines of Defense

Lines of Defense

Structural Measures

Nonstructural Measures

Scenario Planning

Current planning models do not account for relative sea level rise

Evaluation of multiple future without project scenarios

More Informed Decisions = More Time and Cost

Future Without Conditions

Future Scenarios

Application ExamplePearlington, MS

Types of MeasuresPearlington, MS

Impacts of Relative Sea Level

Rise

NED RED EQ OSE

Degradation of risk reduction

Increased impacts to regional economy

Greater degradation of ecological resources

Increased threats to health and safety

Increased emergency costs

Greater strain on local tax burden

Increased risk of plan failure

Greater potential for loss of life

QUESTIONS???

MsCIP WEBSITE http://www.mscip.usace.army.mil

Jeremy M. LaDartjeremy.m.ladart@usace.army.mil251-690-2046