Evaluation of Preliminary DFIRMsPhase I Findings

Evaluation of Preliminary DFIRMsPhase I Findings

Terrebonne Parish June 22, 2009

Creation of a BFECreation of a BFE

The ModelsThe ModelsStill Water Elevation =

1. ADCIRC – Advanced Circulation Model for Coastal Ocean Hydrodynamics. Developed by the USACE to determine the SWEL or storm surge levels for coastal LA.

2. STWAVE – a numerical model used to generate and transform w aves to the shore.

3. JPM-OS – provides a means to model the effects and probabilities of storms that historically have not occurred.

Wave Height =

4. WHAFIS – FEMA’s wave model, based on transects. Topographic characterics along each transect serve as inputs in the model (ground elevation, SWEL, vegetation, and physical features).

Preliminary DFIRMs

02M

0620

07D

Summary of Phase I FindingsSummary of Phase I Findings

• Review of FEMA information indicates numerous scientific and technical deficiencies exist in the DFIRMs

• Primary deficiency appears to be the treatment of barriers in FEMA’s models

• The accurate horizontal location and vertical elevation of barriers should be identified and revised in the models (ex. Thompson Road Extension)

Task 4.3: Review Set-up of Surge Models Used in the FIS

Task 4.3: Review Set-up of Surge Models Used in the FIS

***GRAPHICs dokka***

Task 4.3: Review Set-up of Surge Models Used in the FIS

Task 4.3: Review Set-up of Surge Models Used in the FIS

***GRAPHIC***

Approximately 3 miles north of Dulac, east of Grand Caillou Road: Mis-location of barriers. Barriers defined by FEMA, green; Interagency Performance Team levees, yellow; Red dots, all barriers. Note major gap in barrier near center of picture.

Possible OptionsPossible Options

02M

0620

07D

Discussion of Phase II Discussion of Phase II

• Establish/Confirm Parish Objectives– Insurance Rates, Flood Protection, etc.

• Tailor Scope of Work to Target Objectives – Ensure models accurately depict barriers– Identify barriers that exist today– Identify barriers designed, funded, and at least 50%

complete– Establish horizontal accuracy– Remodel and re-map

• Prepare Appeal/Protest Document

• 90-Day Appeal Period: June 24 to September 21, 2009Cat5hurricaneshutters.com