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Using HAZUS for the Flood Risk Assessment Dataset within FEMA Risk MAP Studies
Dr. Shane Parson, PE, CFM, URS (RAMPP Team)
2011 ASFPM Annual National ConferenceLouisville, KY
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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
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Flood Risk Assessment DataPurpose 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
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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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AAL Usability for Risk MAP Initial study focused on providing state and
watershed based results
As Risk MAP looks to use more detailed results (census block level), an AAL Usability Analysis was conducted to better understand its limitations and refine AAL results as appropriate.
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Flood Risk AssessmentInputs, Outputs, and Delivery Inputs:
• HAZUS AAL Data Source: FEMA• Draft flood depth grids Source: Flood Depth Grid Analysis• Enhanced data Source: Discovery / Local, State, Fed.
GIS
Outputs:• Flood Risk Assessment dataset
– HAZUS AAL Data– Refined HAZUS Data – Composite Data (includes data used for Flood Risk Report and Map)
Delivery:• Drafts presented at Resilience Meeting• Final delivered after Flood Risk review and discussions• Incorporated within Flood Risk DB, Report, and Map
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Development of the Flood Risk Assessment Dataset in Risk MAP
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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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Refined HAZUS Data – Content Scalability Flood Risk Assessment
HAZUS analysis for reaches with new or updated studies where depth grids can be generated
Should include 10%, 4%, 2%, 1%, and 0.2% annual chance events and Annualized Loss
HAZUS GBS Losses (dollar losses, percent damage, business disruption)
Enhancements Additional events Additional HAZUS loss calculations (infrastructure, critical
facilities, user-defined facilities) Use of local data to updated/supplement HAZUS data Non-HAZUS analysis methods (needs to be able to produce the
required output to populate the associated tables in the flood risk database)
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Composite Data – Content Scalability Flood Risk Assessment
HAZUS Combination of AAL and Refined HAZUS Data Should include 10%, 2%, 1%, and 0.2% annual chance events
and Annualized Loss (may include more events) HAZUS GBS Losses (dollar losses, percent damage, business
disruption)
Enhancements Only included if results to be show in Flood Risk Report or Flood
Risk Map
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Flood Risk Assessment Delivered
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Flood Risk Map Elements
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Flood Risk Report Elements
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