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 Engineering Laboratory /                  Fire 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
                      ContactsCommunities already implementing HMM

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The HMM considers that homes within a community are interconnected via combustibles, and therefore their survival during a wildfire depends on unified community hardening. The goal of this method is to provide community leaders with guidance to work with homeowners to protect their properties and the entire community.

The exposure/distance hardening strategy proposed in the HMM offers a path forward that creates discontinuities for fire exposures and selectively hardens structures where clear benefits to ignition resistance can be achieved at a reasonable cost.

Three pilot communities in California are implementing HMM through Cal OES/CAL FIRE's California Wildfire Mitigation Program. So far, project work has only involved assessments. Links to their websites follow:
	Kelseyville Riviera, CA – Lake County – NCO
		Dulzura, CA – San Diego – San Diego County Fire Protection District
		Whitmore, CA – Shasta County – Shasta County Fire Safe Council
	Funding through the California Wildfire Mitigation Program is available for homeowners living in one of the three pilot phase communities noted above at this time. Expanded funding is planned for additional communities in late 2023.

    
    Created July 6, 2023, Updated August 28, 2023 ‹ Paths forward: Implementing HMM
              How Fire Spreads in the WUI ›
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