Where is Risk MAP Now? Update on the Flood Risk Assessment Dataset. Shane Parson RAMPP

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1 Where is Risk MAP Now? Update on the Flood Risk Assessment Dataset Shane Parson RAMPP

2 Agenda Overview Average Annualized Loss (AAL Study) Risk MAP Flood Risk Assessment Dataset Process AAL Data Refined HAZUS Data Composite Data Flood Risk Products Use: Database, Report, Map 2

3 Flood Risk Assessment Data Purpose and Intended Uses Identify Areas and Communicate Relative Flood Risk: Flood prone areas Vulnerable people and property Provide Flood Risk $: Potential damage severity for different flood frequencies Identify locations with possible cost effective mitigation options Improve Estimates for Flood Risk $: Losses from Average Annualized Loss (AAL) Study Refined losses from new flood study depth grids Refined general building stock data from local sources 3

locations with possible cost effective mitigation options Improve Estimates for Flood Risk $: Losses from Average

4 Flood Risk Assessment Inputs, Outputs, and Delivery Inputs: HAZUS AAL Data Draft flood depth grids Enhanced data Source: FEMA Source: Flood Depth Grid Analysis Source: Discovery / Local, State, Fed. GIS Outputs: Flood Risk Assessment dataset Delivery: HAZUS AAL Data Refined HAZUS Data Composite Data (includes data used for Flood Risk Report and Map) Drafts presented at Resilience Meeting Final delivered after Flood Risk review and discussions Incorporated within Flood Risk DB, Report, and Map 4

GIS Outputs: Flood Risk Assessment dataset Delivery: HAZUS AAL Data Refined HAZUS Data Composite Data (includes data used

5 Flood Risk Assessment Datasets Flood Risk Assessment Data 2010 HAZUS Average Annualized Loss (AAL) Study Data Refined HAZUS and Other Risk Analyses Data Composite Data HAZUS MH Flood Risk Assessment 5

6 Summary of AAL Study Hazus-MH Flood Average Annualized Loss Estimation (AAL) was performed for continental U.S. Level 1 Analysis Inputs: County-wide regions 10 sq mile drainage area 30M USGS DEM Default Census data (GBS) Final Output included: Return period losses Total exposure Average Annualized Loss Annualized Loss Ratio Relative Average Annualized Losses by State 6

Level 1 Analysis Inputs: County-wide regions 10 sq mile drainage area 30M USGS DEM Default

7 AAL Results Total Annualized Losses Estimated at 55 Billion: Includes both riverine and coastal Relative Average Annualized Losses by State Annualized Loss Ratio by State Using NFIP program average annual losses and other source of annual flood loss data, sets a lower bound of the annualized flood loss at minimum of 10 billion annually. 7

State Using NFIP program average annual losses and other source of annual flood loss

8 Refined HAZUS Analysis Overview: Depth Grids imported into HAZUS For new study areas HAZUS run for each return period and annualized HAZUS results exported and stored in Flood Risk Database 8

9 Estimation of Losses Dollar Losses Residential Loss Commercial Loss Other Asset Loss Percent Damage Evaluates Building Stock Structure and Content Considerations Business Disruption Considers Total Occupancy Tables Considers Lost Income and Wages 9

Building Stock Structure and Content Considerations Business

10 Development of the Flood Risk Assessment Dataset in Risk MAP 10

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29 Average Annualized Loss (AAL) 29

30 Refined HAZUS 30

31 Composite Data 31

32 Enhanced Flood Risk Assessment Analyses Enhancements could include: Risk Assessments at site-specific locations Incorporation of locally-provided inventory data (first-floor elevations and/or parcel data) Additional sources of flood depth grids Supplemental HAZUS analyses or other types of analyses User defined analysis for loss 32

33 Flood Risk Assessment Delivered 33

34 Flood Risk Map Elements 34

35 Flood Risk Report Elements 35

36 FRA: Risk MAP Phase of Delivery Flood Risk Assessment Results Draft Results : Delivered during Phase C Data Development and Sharing Final Results : Delivered during Phase G Preliminary NFIP Map Release 36

37 Flood Risk Database Requirements Appendix O Appendix O for Risk MAP Requires data to be saved in specific formats 37

38 Flood Risk Assessment Dataset: Minimum Requirements Appendix O for Risk MAP L_RA_AAL: AAL Study data L_RA_Refined: Refined analysis data L_RA_Composite: Composite of AAL and Refined Data S_CenBlk_Ar: Feature class that contains census block exposure data L_Exposure: Community-based summaries of exposure data L_RA_Summary: Community-based summaries of loss data from composite 38

39 Questions? 39

Guidance for Flood Risk Analysis and Mapping. Flood Risk Assessments

Guidance for Flood Risk Analysis and Mapping Flood Risk Assessments May 2014 This guidance document supports effective and efficient implementation of flood risk analysis and mapping standards codified