Hurricane Ivan Surge Inundation Maps

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Hurricane Ivan Surge Inundation Maps

• Community Coordination Meeting
• Florida Escambia, Santa Rosa, and Okaloosa
  Counties
• Alabama Baldwin County

December 9, 2004
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Meeting Agenda

• Introductions
• Description of the maps
• Where to obtain the maps
• Use of the maps for rebuilding
• Future outreach efforts
• Wrap up

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Introductions

• FEMA Staff
• Todd Davison Flood Insurance and Mitigation
  Division Director, Region IV
• Shabbar Saifee Project Monitor
• Contractor Staff
• Gib Jones, Dewberry
• Steve Pardue, URS Corporation
• Lyle Hatchett, URS Corporation

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Purpose of the Project

• To develop maps depicting the surge effects of
  Hurricane Ivan
• To provide Ivan-related hazard information to aid
  in mitigating future flood damages during
  recovery and redevelopment
• To identify areas where more detailed coastal
  studies are warranted

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Data Themes Presented on the Maps

• Base map of aerial photographs
• Coastal High Water Marks (HWMs)
• Inundation limits
• Waterborne debris line
• Surge elevation contours
• Current FEMA Flood Insurance Rate Maps (FIRM)
  flood zones and elevations

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Coastal High Water Marks (HWMs)

• Identified and surveyed in the months following
  Hurricane Ivan
• Additional HWM data from National Oceanic and
  Atmospheric Administration (NOAA), U.S. Army
  Corps of Engineers (USACE), and local communities
  (Destin, Santa Rosa County)
• HWM data include
• Mud lines
• Water stains
• Debris
• Eyewitness testimony
• Some HWM elevations may include wave effects and
  runup

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Inundation Limits

• Mapped coastal HWM elevations onto digital,
  pre-storm topographic contour data
• Attempted to exclude wave effects
• Compared to debris line, and adjusted if
  appropriate

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Debris Lines

• Delineated from aerial photography flown by the
  USACE a few days after the storm

Surge Elevation Contours

• Surge contours mapped at 1-foot intervals based
  upon coastal HWM elevations
• Generalized maximum surge elevation (inherent
  uncertainty and random and irregular spacing of
  coastal HWMs)
• Contours do not include wave effects

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Thanks to everyone who provided data!

• NOAA
• USACE
• Local counties and communities
• Northwest Florida Water Management District
• State of Alabama

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Where to Obtain the Maps

• www.ivanfloodrecoverymaps.net

Background Information and Resources
GIS Data
Maps for Each County
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www.ivanfloodrecoverymaps.net
Notes to Users
Index to Effective FIRMs
Click on Desired Panel to View and/or Download pdf
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www.ivanfloodrecoverymaps.net

• Download GIS Data (Shapefiles)
• High Water Marks
• Surge Inundation Limits
• Surge Elevation Contours

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How to Use These Maps

• These maps document the effects of Hurricane Ivan
  surge
• While they are not directly comparable to
  effective FIRMs, they can be used to communicate
  the risks of coastal flooding
• Lay the foundation for additional future study

How Not to Use These Maps

• Flood insurance determinations or insurance
  rating

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Future Outreach Activities

• Public Meeting on December 16, 2004
• Follow-up technical assistance meetings in
  January, where necessary

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Wrap Up

• Questions/discussion?