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3-D Flood Risk Visualization

3-D Flood Risk Visualization. Beth Norton December 21, 2011. Background. Floods are one of the most common hazards in the US FEMA provides flood risk data to community officials through flood mapping products Participating communities in the NFIP regulate and enforce the flood maps. Problem.

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3-D Flood Risk Visualization

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  1. 3-D Flood Risk Visualization Beth Norton December 21, 2011

  2. Background • Floods are one of the most common hazards in the US • FEMA provides flood risk data to community officials through flood mapping products • Participating communities in the NFIP regulate and enforce the flood maps

  3. Problem • Risky decisions are made • Communities allowing development in the floodplain • Developers buying land and building homes in the floodplain • The impacts of these decisions aren’t borne by those making them • Homeowners purchase the risk • Federal government insures the risk • First responders risk their lives to rescue people at risk • Flood maps are 2-D and don’t portray immediate risk • The forces of flood damage can’t be shown on a 2-D map. • Homeowners and potential homebuyers need tailored information

  4. 2-D Flood Map

  5. Flooding Damage Forces • Hydrodynamic Forces • Moving water • The faster the water, the greater the pressure and erosion. • Hydrostatic Forces • Standing water • The deeper the water, the more it weighs and greater the pressure. • 3 feet of standing water can collapse a standard frame house • Debris • Ice floes • Large objects • Sediment • Soaking • Damages building materials and household goods *Source: FEMA: Managing Floodplain Development through the NFIP, 2/15/2010

  6. Proposal (Solution) 500 year 100 year 50 year

  7. Proposal (Solution) 500 year 100 year 50 year

  8. Process • Software • SketchUp • 3-D Buildings • 3D Analyst • 3-D flood hazard data • ArcScene • Visualization

  9. Data • Provided by the NCFMP • Base Data • 2010 Orthoimagery • Street Centerlines • Streams • Tax Assessor Data • LiDAR • Built-Environment Data • Digitized Building Footprints • Building Photos • Raster Datasets • Water Surface Elevation (WSEL) and Depth Rasters (Multi-Return Periods) • 10, 25, 50, 100, and 500 years

  10. Data (cont) • Risk Data • Building Footprints attributed with • First Floor Elevations • Lowest and Highest Adjacent Grade • Number of stories • Estimated building and content loss • Flood Depths • Flood Elevations • Annualized Damages • Regulatory Data • FIRM • FIS • Database

  11. Project Area • Tarboro, Edgecombe County, NC* • Population – 13,121 • Land Area – 9.8 square miles • Flood History • July 1919 flood • Exceeded the 100-year flood • Hurricane Floyd, 1999 • Exceeded the 500-year flood • $5 Billion in damages to NC • Hurricane Irene, 2011 * Source: 11/3/2004 FEMA Flood Insurance Study, Edgecombe County, NC

  12. Project Area - Overview 1 4 3 2 *Source: www.ncfloodmaps.com

  13. Project Area - Residential *Source: www.ncfloodmaps.com

  14. Project Area – Residential and Commercial *Source: www.ncfloodmaps.com

  15. Project Area – Lower Residential *Source: www.ncfloodmaps.com

  16. Project Area - Undeveloped *Source: www.ncfloodmaps.com

  17. Questions ????

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