1 May 24, 2007 FEMA Texas Gulf Coast Mapping after Hurricane Rita Stephen C. Altman, P.E., CFM Michael Baker, Jr. Inc.

2 Outline Pre-Hurricane Hurricane Rita Post Hurricane

3 Pre-Hurricane One Texas Coastal County in Post Preliminary Process –Harris County (Effective 6/18/2007) Five Texas Coastal Counties initiated with FY05 Flood Map Modernization Funds –Brazoria County –Cameron County –Chambers County –Galveston County –Nueces County

4 Pre-Hurricane Topographic Data –Existing Topographic Data Coastal Storm Surge –Identified as need by FEMA Region VI USACE-NO USACE-ERDC RMC VI –Methodology ADCIRC WHAFIS –Funding Limited

5 Hurricane Rita September 23, 2005

6 Hurricane Rita Landfall September 23, 2005 Presidential Declared Disaster September 25, 2005 Damages > $10 Billion (includes Texas and Louisiana)

7 Post Hurricane Storm Surge New Topographic Data DFIRM Mapping

8 Storm Surge Expanded Scope from Pre-Hurricane –Storm Surge Analyses for all 18 Texas Coastal Counties Expanded Resources for Analyses Team –USACE-NO Nationwide Team IPET participants Methodology –Joint Probability Method (JPM) –ADCIRC –STWAVE –WHAFIS –Identical for Texas and Louisiana

9 Storm Surge Need for updated Topographic Data –USGS DEM Disadvantages Too Coarse for Detailed Coastal Mapping Age of Data –Subsidence –LiDAR Advantages More Detailed Flown in 2006 Schedule –Kick-off April 2007 –Complete December 2007

10 Topographic Data Existing Data –Harris County LiDAR Data –Corpus Christi LiDAR Data –TNRIS LiDAR Data (Cameron and Willacy Counties) –Various Community Topographic Data Sets –10 and 30 Meter USGS DEM

11 Topographic Data New LiDAR Data Needed –FEMA Region VI funds (MapMod and DRF) Leverages Investment in Coastal Analyses –Data to be Acquired/Developed Bare Earth DEM Breaklines 2-foot Contours –Data will be available from TNRIS to Communities

12 Topographic Data Partners Funded in FY06 to Acquire LiDAR data –FEMA IDIQ Nueces County (outside Corpus Christi) –TNRIS (FEMA CTP) Aransas Brazoria Calhoun Chambers Galveston Jackson Jefferson Matagorda Orange Refugio San Patricio Victoria

13 Topographic Data Schedule –FEMA IDIQ All data has been submitted to FEMA –TNRIS All data has been acquired Bare Earth Data approved in 7 of 12 Counties Breaklines to be submitted to FEMA in June and July 2007 Contour Processing to be submitted late summer 2007

14 DFIRM Mapping FY06 Funding Cycle –5 Counties Funded with Disaster Recover Funds (DRF) Chambers, Galveston, Harris, Jefferson, and Orange Covers Coastal Analyses –15 of 18 Coastal Counties Funded with MapMod Funds Includes all Five Counties with FY05 Funding Includes Harris County –Will Be Mapped as Physical Map Revision (PMR) Covers all tasks for Non-DRF Counties Covers DFIRM Mapping Tasks for DRF Counties

15 DFIRM Mapping FY07 MapMod Funding Cycle –2 Additional Counties Kleburg Willacy Schedule –Preliminary Maps for all 17 Counties by end of FY08

16 DFIRM Mapping

17 Questions?