Storm Surge Analysis Update Meeting Cross City, Florida June 17, 2014

Transcription

1 Big Bend Coastal Storm Surge Study Storm Surge Analysis Update Meeting Cross City, Florida June 17, 2014

2 Introductions Risk MAP Project Team FEMA Region IV Florida Division of Emergency Management (FDEM) Suwannee River Water Management District (SRWMD) RAMPP staff (study contractor) Horseshoe Beach 2

3 Agenda Introductions Goals for Today Big Bend Coastal Surge Study Project Overview & Schedule Storm Surge Methodology Stillwater Elevation Information Risk MAP Overview & Products Mitigation Actions Next steps Meet to gather input Cedar Key Hickory Mound Unit 3

4 Who s Here? State partners and officials Officials from local communities Floodplain Administrators Emergency Managers Engineers FEMA contracted engineering firms Federal agency partner representatives Non-governmental organizations 4

5 Goals for Today Promote engagement with the communities Discuss the Big Bend Coastal Surge Study and the status of the study Discuss the study methodology and results Mesh Development Storm Climatology Validation Storms Stillwater Elevations Gather technical inputs and feedback from you 5

6 Your Role is Important Share local data or new information Identify potential issues Provide inputs on coastal study methodology and results Relate study information and status to other stakeholders Shell Mound County Park 6

7 FEMA Region IV Coastal Studies 7

8 Big Bend Coastal Surge Study 8

9 Project Work Plan Work to be done by RAMPP (PTS): Perform coastal storm surge and wave height analyses for Taylor, Dixie and Levy Counties Perform coastal floodplain delineation and develop workmaps Develop coastal Risk MAP Products Support Discovery and Outreach to create ownership of the coastal analysis at state and local level Work to be done by SRWMD (CTP): Perform the preliminary map production Perform post-preliminary map production and CCO Meeting/Open House CCO: Consultation Coordination Officer CTP: Cooperating Technical Partner PTS: Production Technical Services SRWMD: Suwannee River Water Management District 9

10 Project Status Accomplished Discovery Kick-off: 12/07/2011 Discovery Meeting: 03/19/2012 Mesh Review Meeting: 08/22/2012 Production Runs: January 2012 November 2013 Ongoing Stillwater Elevation (SWEL): November current 10

11 Why Update Surge in Big Bend Flood risk changes over time Effective study based on an outdated hurricane modeling and topographic data We chose your counties to review due to risk and ongoing studies in the area Significant flood risk from coastal storms (hurricanes, tropical storms, nor'easters) Increase in population and development since effective coastal FIRMs were published Ongoing riverine watershed flooding studies in Levy County To gain a complete and current picture of coastal flood risks. This helps the community: Plan for the risk Communicate the risk to your citizens Take action to reduce flood risk to lives and property Build smarter and safer 11

12 Why Update Surge in Big Bend Current surge analysis is 33 years old 1981 HUD Standard Coastal Storm Surge Model Your risk is better defined through New Guidelines to be implemented Atlantic Ocean and Gulf of Mexico Guidelines Update (2007) Sheltered Water Report (2008) PM 50 Limit of Moderate Wave Action (LiMWA) (2008) Base data updated: topographic dataset and aerial imagery to high resolution products and seamless Digital Elevation Model (DEM) New climatological data based on recent storms Updated coastal hazard methodologies/modeling Improvement in GIS technologies to improve coastal mapping accuracy 12

13 Why Update Surge in Big Bend FDEM Evacuation Study 2010 study to map inundation levels for evacuation planning Project area includes all of Florida coast Base data includes recent LiDAR data Uses SLOSH model Big Bend Coastal Study Study to map 1% annual chance flood hazard area Project includes Big Bend counties only Base data includes recent LiDAR data Uses ADCIRC and SWAN Models Source: 13

14 Data Reviewed to Date We have reviewed data and documentation that are available for: Topographic Light Detection and Ranging (LiDAR) Bathymetry Data NOAA NOS database Historic FIS reports (including preliminary FIRM in production) Aerial images Boundary, hydrography, and transportation layers Gage records Meteorological records Fort Island 14