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1 Using HAZUS for a Statewide Flood Risk Assessment Steve Cowdin, CA DWR Ken Leep, Cal EMA

2 Problem We frequently receive requests for statewide flood data Who s at risk? What s at risk? Where is at risk? But, we have no consistent statewide flood risk data! HAZUS can be part of the solution

3 What is HAZUS? A FEMA tool to estimate losses Floods Earthquakes Wind/Hurricanes GIS based software Data integration tools to improve analysis Comprehensive Data Management System Flood Information Tool

4 What does HAZUS do? Estimates social and economic impacts Direct physical damage Induced physical damage Direct economic/social losses Indirect economic losses Answers what if questions Building code modifications (ex: building elevations and materials) Levees or flow regulation structures

5 What Can HAZUS be Used For? Emergency preparedness Develop evacuation plans Develop emergency response plans Organize response exercises

6 What Can HAZUS be Used For? Mitigation analysis Assess communities at risk Evaluate mitigation measures Development of fst State t Hazard dmiti Mitigation Plan Development of Local Hazard Mitigation Plans

7 What Can HAZUS be Used For? Response and recovery Post disaster damage assessment Identify critical infrastructure Recovery action planning Long term economic recovery planning

8 Level 1 Levels of Analysis out of box National default databases Use only for regional analyses Level 2 Substitute local hazard and inventory data Better for community analyses Level 3 Change functional relationships Best for community analyses

9 Levels of Analysis ** * * * Replaced with CDMS * * Example Modified depth/damage curves

10 Model Loss Methodology 4. Estimate losses 3. Estimate damage 2. Define inventory 1. Define hazard Earthquake Flood Hurricane

11 Model Output Earthquake Ground Shaking Ground Failure Flood Frequency Depth Discharge Velocity Hurricane Wind Pressure Missile Rain Direct Physical Damage General Building Stock Essential Facilities High Potential Loss Facilities Transportation Systems Utility Systems Induced Physical Damage Fire Following Hazardous Materials Release Debris Generation Direct Economic/Social Losses Building Replacement Cost Income Loss Crop Damage Casualties Generic Output Shelter Needs Indirect Losses Production Income Employment Impacts With/Without Aid

12 Statewide Flood Assessments (2007) * Maryland Indiana Pennsylvania Missouri Nevada * Mississippi * Wisconsin * West Virginia * South Carolina * Connecticut * Arkansas * * In progress

13 Maryland Level 1 Flood Assessment Number of Buildings Damaged/100 YR Event

14 CA Flood Risk Assessment Address these questions: What property (i.e., structures, critical infrastructure, utilities, etc.) is at risk from flooding? How much population is at risk from flooding, including gg groups that may yb be especially yv vulnerable to flooding and other natural disasters (such as low income, elderly, minorities, etc.)? What are the potential economic and social losses that may occur from flooding?

15 CA Flood Risk Assessment Study regions Counties Hydrologic regions Flood types Riverine Coastal Alluvial fans CA Water Plan Hydrologic Regions

16 CA Statewide Flood Assessment OES Map with FEMA 100 and 500 YR Flood Zones

17 DWR Programs Potentially Benefited State Statewide flood planning CA Water Plan Central Valley Flood Management Planning Program Various floodplain management programs Cal Emergency Management Agency (OES) State Hazard Mitigation Plan Compliance with SB 24 Repository of State essential facility databases?

18 Programs Potentially Benefited Federal FEMA First California statewide flood assessment Coordinate with regional efforts already underway Corps Watershed and/or reconnaissance level studies

19 Programs Potentially Benefited Local Local planning General plan updates Land use planning Emergency planning Local Hazard Mitigation Plans

20 Challenges DATA for Level 2 analyses H&H Inventory Levees Currently can only draw in levees and Assign level of protection Resources Trained staff Funding

21 Other Examples Orange/Riverside/San Bernardino Counties CA DWR San Diego County Indiana DNR - Dearborn County Washington DNR Mt. Rainier Debris Flows

22 Orange/Riverside/San Bernardino Counties Countywide risk assessments Flood Earthquakes Level 2 analysis Hazard data Inventory Uses Update emergency planning Update hazard mitigation plans

23 CA DWR San Diego County Level 1 & 2 analyses H&H Level 1 (Default) Level 2 (DFIRM) Inventory Level 1 (Default)

24 Indiana DNR Dearborn County Level 2 analysis User defined data H&H Site specific inventory Source: Polis Institute, Indiana University

25 Level 1 & 2 analysis Washington DNR Mt Rainier i Debris Flow Analysis User defined debris flows Aggregate inventory Source: Ray Cakir, WDNR

26 FEMA HAZUS Links Overview User Groups reghugs shtm Presentations /p /p / / Other Colorado State University

27 Questions/Comments?