Overview of HAZUS Flood Loss Estimation Model

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Overview of HAZUS Flood Loss Estimation Model
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HAZUS Flood Loss Estimation Model Model
Development Approach

• Identify User Requirements
• Evaluate Alternative Methods
• Perform Proof-of-Concept Exercises
• Develop Software Requirements with User Input
• Develop Software
• Pilot Test
• Release

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HAZUS Flood Loss Estimation Model User Requested
Applications

• Development and enforcement of building standards
• Analyzing benefits of flood warnings
• Benefit/cost analysis for selection of mitigation
  alternatives
• Identification of areas for building acquisition
  / relocation
• Information dissemination / public relations
• Disaster declaration assistance
• Prioritizing watersheds (Austin, TX)
• Analyzing impacts of new mapping (Mecklenberg,
  NC)
• Forecasting impacts of new development
  (Mecklenberg, NC)

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HAZUS Flood Loss Estimation Model Methodology
4. Estimate Losses
3. Determine Damage
2. Define and Overlay Inventory
1. Define Hazard Flood Surface - Land Surface
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A Flood Information Tool (FIT) for characterizing
the flood hazard will be developed to facilitate
a Level 2 Analysis
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Surfaces Used to Develop Depth Grid
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Flood Information Tool Floodplain Boundary

• Defines the limit of analysis

• Required format ESRI polygon

• Potential sources DFIRM, FEMA Q3

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Flood Information Tool Riverine Centerline

• Centerline represents the general direction of
  flow

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Flood Information Tool Riverine Bounding Polygon

• Buffer the centerline to define the extent of the
  flood surface

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Flood Information Tool Riverine BFE Lines

• Lines of flood elevations are user-supplied

• Upstream and downstream limits identify the
  elevation lines within area of interest

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Flood Information Tool Riverine Flood Elevation
Interpolation
Elevations interpolated between flood elevation
lines
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Flood Information ToolRiverine Depth Grid
Backwater Analysis
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HAZUS Flood Loss Estimation Model Flood Depth
Determination
Subtract ground surface from flood surface to
determine flood depth at all locations in the
study area
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HAZUS Flood Loss Estimation Model Losses

• Two methods supported for estimating replacement
  value of structures

• Full replacement value
• Depreciated replacement value

• Shelter need functions relate building damage to
  habitability and restoration time

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HAZUS Flood Loss Estimation Model
Basement-Modified FIA Depth-Damage Curve for
Structure Damage
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HAZUS Flood Loss Estimation Model Sample Output
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HAZUS Flood Loss Estimation Model Project Schedule
Task Completion Develop flood loss estimation
methodology Fall 2001
Flood Information Tool Software
development Spring 2002
Flood Model Software development Summer 2002
Pilot test and calibrate Winter 2002
Release HAZUS Flood Model Spring 2003