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HAZUS ®MH Coastal Flood Hazard Analysis

HAZUS ®MH Coastal Flood Hazard Analysis. FATIH C. DOGAN ABS CONSULTING. HAZUS ®MH Overview. Standardized, nationally applicable natural hazards loss estimation methodology Developed by FEMA, under a cooperative agreement with NIBS (www.fema.gov/hazus & www.nibs.org/hazusweb)

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HAZUS ®MH Coastal Flood Hazard Analysis

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  1. HAZUS®MHCoastal Flood Hazard Analysis FATIH C. DOGAN ABS CONSULTING

  2. HAZUS®MH Overview • Standardized, nationally applicable natural hazards loss estimation methodology • Developed by FEMA, under a cooperative agreement with NIBS (www.fema.gov/hazus & www.nibs.org/hazusweb) • GIS (Geographic Information System) based • HAZUS-99 SR2 currently has MapInfo® and ArcView® versions ABS Consulting

  3. HAZUS®MH Components • Next generation HAZUS currently under development • Expanded with multi-hazard methodology for estimating potential losses from wind and flood hazards. • Flood Model (riverine and coastal flooding) • Wind Preview Model (hurricane direct damage only) ABS Consulting

  4. HAZUS®MH • Single user GIS-based software package • Designed for ArcGIS version 8.1.2 with the Spatial Analyst extension • Windows 2000 operating system • Scheduled for release first quarter 2003 ABS Consulting

  5. HAZUS®MH Flood Model Results • Available formats: maps, tabular, summary reports • Hazard maps – flood depth, erosion depth • Building stock loss – structure and contents • Lifeline damage – bridges, treatment plants • Shelter requirements • Indirect economic losses – market sector recovery • Produced for specific return periods, suites of return periods, or annualized losses • Can be exported for use with enterprise GIS ABS Consulting

  6. HAZUS®MH Flood Model Methodology 4. Estimate Losses 3. Determine Damage 2. Define and Overlay Inventory 1. Define Hazard: (Flood Surface- Land Surface) ABS Consulting

  7. Flood Elevation Ground Elevation HAZUS®MH Flood Model Hazard Determination Subtract ground surface from flood surface to determine flood depth throughout the study area Datum

  8. HAZUS®MH Flood Model Coastal Hazard Pre-storm ground surface from DEM Adjust ground surface to account for dune erosion Calculate flood surface grid through wave height and runup analyses Calculate flood depth grid as flood surface - ground surface Map A and V coastal flood hazard zones ABS Consulting

  9. HAZUS®MH Flood Model User Input • Study region created through HAZUS shell • DEM • Return period to analyze • Select shoreline(s) • Segment and characterize shoreline(s) • Shoreline type • 100 yr SWEL and wave setup (from an FIS or other source) ABS Consulting

  10. Tr 1-4 Tr 2-2 Tr 2-1 Tr 2-3 Tr 1-5 Tr 2-0 Tr 1-3 Tr 1-2 Tr 1-1 Tr 1-0 Segment 2 Segment 1 HAZUS®MH Flood Model Segments & Transects • Segment based on common characteristics • Transects every 1000ft or so ABS Consulting

  11. Transect Profiles • Query DEM along the transect with an interval of cellsize/ 3 ABS Consulting

  12. Dune Peak Dune reservoir Stillwater Elevation Dune Toe Mean Sea Level Ridge Type Dune reservoir (Rear Shoulder) Stillwater Elevation Dune Toe Mound Type FEMA Guidelines Dune Peak Mean Sea Level ABS Consulting

  13. FEMA Guidelines (cont.) • Adjustment of profile to approximate post storm eroded profile: • Dune Removal • Dune Retreat • For a 100-year storm, the frontal dune reservoir should be at least 540sqft (or 20 cubic yards volume per along the shore) to prevent REMOVAL. ABS Consulting

  14. HAZUS®MH Flood Model Estimating Dune Peak and Toe • Dune Peak: The highest point along the transect profile within the first 500ft landward of shoreline. • Dune Toe: The most landward intersection of 10 year SWEL with the transect profile. (must be seaward of peak) ABS Consulting

  15. Dune Peak N-yr SWEL Dune Toe 10 yr SWEL Mean Sea Level HAZUS®MH Flood Model Estimating Frontal Dune Reservoir A B • N-year SWEL: Calculated based on default ratios (Ex: Atlantic 10yr 64%, 50yr 88%, 500yr 123%) • Required reservoir to prevent removal: Based on return period and coastal area (Lake Ontario, other Great Lakes, all other areas) • Res.= 0.7A+B ABS Consulting

  16. FEMA Removal & Retreat Dune Peak Dune reservoir Stillwater Elevation Original Ground Profile Retreat Removal Dune Toe Adjusted Ground Profiles ABS Consulting

  17. 1 on 50 Dune Toe HAZUS®MH Flood Model Coastal Erosion REMOVAL Dune Peak N-yr SWEL Dune Toe 1 on 50 10 yr SWEL Mean Sea Level Usually removed volume is enough to fill lower areas Horizontal 1 on 50 slope No adj. ABS Consulting

  18. HAZUS®MH Flood Model Coastal Erosion RETREAT Dune Peak N-yr SWEL 1 on 1 1 on 40 10 yr SWEL Mean Sea Level Horizontal at toe elev. 1 on 40 slope No adj. Check removed volume against the required reservoir, iterate until close enough. ABS Consulting

  19. HAZUS®MH Coastal Erosion • Create points with z-value from the eroded transect profile • Interpolate new surface grid which will be used in WHAFIS and Runup calculations to create flood surface grid. • Flood surface- Eroded ground= Flood depth • Subtract eroded ground grid from original ground to get “Erosion Depth Grid” ABS Consulting

  20. HAZUS®MH Coastal What-If Scenarios • Long-term erosion – inventory location • Shore protection – erosion susceptibility • Buyout – inventory location • Building codes – first floor elevation/ elevated structures ABS Consulting

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