1

May 24, 2007

FEMA Texas Gulf Coast Mapping after FEMA Texas Gulf Coast Mapping after Hurricane RitaHurricane Rita

Stephen C. Altman, P.E., CFMStephen C. Altman, P.E., CFMMichael Baker, Jr. Inc.Michael Baker, Jr. Inc.

FEMA Texas Gulf Coast Mapping after FEMA Texas Gulf Coast Mapping after Hurricane RitaHurricane Rita

Stephen C. Altman, P.E., CFMStephen C. Altman, P.E., CFMMichael Baker, Jr. Inc.Michael Baker, Jr. Inc.

2

OutlineOutline

• Pre-Hurricane• Hurricane Rita• Post Hurricane

3

Pre-HurricanePre-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-HurricanePre-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 RitaHurricane Rita

• September 23, 2005

6

Hurricane RitaHurricane Rita

• Landfall September 23, 2005• Presidential Declared Disaster September 25,

2005• Damages > $10 Billion (includes Texas and

Louisiana)

7

Post HurricanePost Hurricane

• Storm Surge• New Topographic Data• DFIRM Mapping

8

Storm SurgeStorm 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 SurgeStorm 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 DataTopographic 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 DataTopographic 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 DataTopographic 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 DataTopographic 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 MappingDFIRM 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 MappingDFIRM Mapping

• FY07 MapMod Funding Cycle– 2 Additional Counties

• Kleburg• Willacy

• Schedule– Preliminary Maps for all 17 Counties by end of FY08

16

DFIRM MappingDFIRM Mapping

17

Questions?