Flood Risk Assessment Data

Report
Update on Use of Hazus
for FEMA Risk MAP Flood
Risk Products
Shane Parson – RAMPP PTS (URS)
Agenda
 Overview of Risk MAP Non-Regulatory Products and Datasets
 Flood Risk Assessment (FRA) Dataset
• Process
• AAL Data
• Refined HAZUS Data
• Composite Data
• Summary Data
 FRA data in the Flood Risk Products
• Flood Risk Database
• Flood Risk Report
• Flood Risk Map
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Program Product Comparisons
Traditional Regulatory Products
DFIRM Database
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Program Product Comparisons
Non-Regulatory Flood Risk Products
DFIRM Database
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Flood Risk Products and Datasets
Three Flood Risk Products
Four Flood Risk Datasets
• Flood Risk Database
• Flood Depth & Analysis Grids
• Flood Risk Report
• Flood Risk Assessments
• Flood Risk Map
• Changes Since Last FIRM
• Areas of Mitigation Interest
Flood Risk
Database
Flood Risk Report
Flood Risk Map
Flood Risk Datasets
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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
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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
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Scope of Flood Risk Assessment
Dataset
 Discovery Meeting
 Regulatory Products
 Deployment Requirements
 Metrics
 Existing Hazus Studies
 Available Data and Funding
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AAL Study
 2010 HAZUS-MH Flood Average Annualized Loss Estimation (AAL) was
performed for continental U.S. using MR4
 Inputs:
• County-wide study regions
• 30 meter DEM
• Default Census data
 Final Output included:
• Total exposure
• Average Annualized Loss
• Annualized Loss Ratio
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Flood Risk Assessment Data
Refined HAZUS Analysis
 Overview
• Depth Grids from new study areas imported into HAZUS
• HAZUS run for each return period, losses estimated, and annualized
• HAZUS results exported and stored in Flood Risk Database
 Estimation of Losses
• Dollar Losses
 Residential Loss
 Commercial Loss
 Other Asset Loss
• Percent Damage
 Evaluate Building Stock
 Structure and Content Considerations
• Business Disruption
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Development of the Flood Risk Assessment
Dataset in Risk MAP
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Average Annualized
Loss (AAL)
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Refined HAZUS
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Composite Data
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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
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Coastal Considerations for Flood
Risk Assessment
 AAL study used separate riverine and coastal flood modeling
 1 % annual chance (100-yr) only required Refined analysis
(due to availability of wave height data for BFE)
 Other return period losses could be estimate be deriving
coastal depth grid based on stillwater elevations and
estimates of wave height
 Hazus coastal loss modeling only needed in locations with
wave heights
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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
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Flood Risk Assessment Delivered
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Flood Risk Database
Overview
 Primary Storage Device for all Flood Risk Data
• Changes Since Last Firm (CSLF)
• Risk Assessment
• Flood Depth and Analysis Grids (DAGs)
• Areas of Mitigation Interest (AOMIs)
 Stores Data to Create:
• Flood Risk Report
• Flood Risk Map
 Delivered Digitally to Stakeholders
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Flood Risk Assessment in FRD
 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
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Flood Risk Report
Overview
 Background:
• Purpose, Methods
• Risk Reduction Practices
 Project Results
• Changes Since Last FIRM
• Depth & Analysis Grids
• Flood Risk Assessment
• (enhanced analyses)
 e.g. Areas of Mitigation Interest
 Summarized by Locations
• Communities and Watersheds
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Flood Risk Report Content –
Community Summaries
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Flood Risk Report
Section 3
 Flood Risk Datasets – Risk Assessment Results
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Flood Risk Map
Background
 The FRM’s intent is to provide a geographic summary of risks within the
project area
 The FRM is not a regulatory product, and is intended to focus on
specifically-identified risk areas
 In most cases, the FRM is created along with the FRD as companion
elements to the H & H study
 This integrated approach is to produce a map that requires little or no
manual cartographic finishing
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Flood Risk Map
Flood Risk Data
 Census Blocks symbolized with Risk
Assessment Data
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Guidance for Non-Reg Datasets &
Products
 Appendices to Guidelines and Standards for Flood Risk Analysis and Mapping
• Draft: Appendix N – Flood Risk Data Development
• Draft: Appendix O – Format and Standards for Non-Regulatory Flood Risk Products
 Operating Guidance
• 1-11: Risk MAP Guidance for Incorporating Mitigation Planning Technical Assistance
and Training into Flood Risk Projects
• 2-11: Operating Guidance for Creation of Risk MAP Products
• 3-11: Communicating Flood Risk with Risk MAP Datasets and Products
• 4-11: Risk MAP Meetings Guidance
• 6-11: User Guidance for Flood Risk Datasets and Products
• Draft: Guidance for Additional Non-Regulatory Products for Coastal and Dam Flooding
Analysis
 Procedure Memos
• PM #65: Guidance for Additional Enhanced Dataset Definitions and Flood Risk
Database Standards
• PM #59: Guidance for Implementation of Watershed-Based Studies
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