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Improving Coastal Resilience: Addressing Challenges in Climate Change and Sea Level Rise

This update covers critical issues related to sea level rise, data management for storm surge modeling, land use planning, and efficient protection structures. It also discusses the conversion of A Zones to V Zones, increased construction costs, and lack of federal assistance in V Zones.

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Improving Coastal Resilience: Addressing Challenges in Climate Change and Sea Level Rise

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Presentation Transcript

  1. DFIRM SubcommitteeUpdate

  2. Challenges Remain • Climate Change and Sea Level Rise: Identify sea level rise timeframe and associated critical issues • Data Management: Identify ways to improve data collection and management for storm surge modeling • Land Use and Zoning: Use of coastal land use codes and robust community and land use planning • Efficient Standards: Materials research supporting affordable and stronger protection structures • Surge Models: Improving protection predictive tools

  3. Appealing FEMA Digital Flood Insurance Rate Maps • The Preliminary DFIRMS result in a significant conversion of A Zones to V zones • Building within V Zones results in increased construction Costs • Federal Assistance is unavailable in V Zones

  4. Technical Issues • Modeling Software • ADCIRC: Advanced CIRCulation Model • Coastal Surge Model determines Still water elevation (SWEL) • STWAVE:Steady state spectral WAVE Model • Coastal Wave Model Which Generates Near shore Waves • WHAFIS • Wave height model which computes wave crest elevations based on SWELs Output From ADCIRC • Determines the Flood HAZARD ZONE and FLOODPLAIN MAP ELEVATIONS based on WAVE Heights

  5. Justification For DFIRM Reevaluation • Calibration errors are present associated with the hindcast for Hurricane RITA: Errors in Predicted High Water Marks (HWM) compared to measured HWM are +/- 4.5 feet • An Examination of the Preliminary ADCIRC GRID has revealed major Chenier ridges, levees, manmade features, and other topographic data were omitted from the model

  6. Preliminary Report Findings • Low Resolution of Topographic data in all models • Poor calibration of Surge models • Improper application of input Data • Inconsistent Elevation Data between Models • Omission of Input Data Finding: Dr. Joseph Suhayda

  7. DFIRM Path Forward • FEMA Rejected CPRA/LRA Time Extension Request • LRA & CPRA Provide Technical Assistance and Guidance to Coastal Parishes during Appeal Process • Prepare Justification and Plan of Accomplishments - Time Extension Just. • Recommendation to CPRA/LRA • Alternatives – Incentivize Storm Surge Risk Reduction • FEMA Presentation/Washington Support

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