# Presentation: 561808

## Hurricane Ivan Surge Inundation Maps

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

- December 9, 2004

## Meeting Agenda

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

## 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

## 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

## Slide 5

## Slide 6

## 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

## 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

## 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

## 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

## Thanks to everyone who provided data!

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

**Notes:**
NOAA:
Tide gage data
Storm path
SLOSH model results
Post-Hurricane LiDAR data (in conjunction with USACE)
Recurrence interval assessment
Feedback on approach
U.S. Army Corps of Engineers
Tide gage data
Post-Hurricane aerials
USGS
Gage data
Pre-hurricane orthoimagery
Counties:
Aerial photographs
Topographic data
Input on damaged areas and areas in need of restudy
Communities
Destin – HWM data
Santa Rosa County – Beach nourishment data (including transect data)
Input on damaged areas and areas in need of restudy
State of Alabama, OWR
Facilitated data collection (topo and aerials) for Baldwin County
Northwest Florida Water Management District
Topographic data
Aerial photographs

## Where to Obtain the Maps

- _[www.ivanfloodrecoverymaps.net](http://www.ivanfloodrecoverymaps.net/)_

**Background Information and Resources**

**Maps for Each County**

**GIS Data**

## Notes to Users

**Notes to Users**

**Index to Effective FIRMs**

**Click on Desired Panel to View and/or Download pdf**

- _[www.ivanfloodrecoverymaps.net](http://www.ivanfloodrecoverymaps.net/)_

## www.ivanfloodrecoverymaps.net

- _[www.ivanfloodrecoverymaps.net](http://www.ivanfloodrecoverymaps.net/)_

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

## 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

## Future Outreach Activities

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

## Wrap Up

- Questions/discussion?