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Engineering LaboratoryFire Research Division

## Wildland-Urban Interface Fire Group

-  HAZARD MITIGATION METHODOLOGY (HMM)  Expand or Collapse    -  Why Implement HMM in your Community?  Expand or Collapse      -  Exposures During WUI Fires 
    -  HMM vs Traditional Hazard Mitigation 
    -  WUI Definitions 
    -  Structure Survivability in the WUI 
    -  Community Survivability in the WUI 
    -  Paths forward: Implementing HMM 
    -  Communities already implementing HMM 
  -  How Fire Spreads in the WUI  Expand or Collapse      -  How do Structures Survive WUI Fires? 
    -  Fire Spread Pathways 
    -  Why Exposure Matters, not Parcel Boundary 
    -  Hazard from Fuel Agglomeration 
    -  Community-scale WUI Fire Hazards 
  -  Community-Wide Structure- and Parcel-Level Hardening Actions  Expand or Collapse      -  How Density Impacts Community 
    -  Workflow for HMM Hardening Actions 
    -  Structure Hardening for Embers 
    -  Parcel Hardening for Fire: the Three R’s 
    -  Surrounding Parcel Hazard Mitigation 
    -  Primary Parcel Hazard Mitigation 
    -  Structure Hardening for Fire 
    -  Communities Hardening Actions 
  -  Hardening Actions: Construction Guidance 
  -  Contacts 

# HMM vs Traditional Hazard Mitigation

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HMM GOES BEYOND THE TRADITIONAL APPROACH OF PROTECTING INDIVIDUAL HOMES.IT ADDRESSES THE *UNIFIED* PROBLEM OF PROTECTING *ENTIRE* WUI COMMUNITIES.

Other approaches to WUI fire parcel hazard mitigation may have different goals compared to the HMM. Some traditional approaches emphasize defensible space focused on individual homes and rely on first responder actions to save homes. Others focus on engaging residents and providing education for voluntary community participation.

The HMM provides preventive guidance for home and property protection with the goal that homes stand alone without relying on first responders. This science-based methodology uses the knowledge collected from post-fire field observations and analysis of field data. Additionally, the HMM utilizes the latest technical knowledge gained from laboratory and large-scale experimental research in fire propagation and hazard mitigation in the WUI.

Implementation of HMM increases the likelihood of structure survival without external intervention in the form of defensive actions.

Figure 14

-  **‹** Exposures During WUI Fires 
-  WUI Definitions **›** 

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