Name: Wildfire Risk Index (SWRA 2010)

Display Field: WildFire_Risk_Scale

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Description: The Wildland Urban Interface (WUI) Risk Index layer is a rating of the potential impact of a wildfire on people and their homes. The key input, WUI, reflects housing density (houses per acre) consistent with Federal Register National standards. The location of people living in the Wildland Urban Interface and rural areas is key information for defining potential wildfire impacts to people and homes.The WUI Response Index is derived using a Response Function modeling approach. Response functions are a method of assigning a net change in the value to a resource or asset based on susceptibility to fire at different intensity levels, such as flame length. The range of values is from -1 to -9, with -1 representing the least negative impact and -9 representing the most negative impact. For example, areas with high housing density and high flame lengths are rated -9 while areas with low housing density and low flame lengths are rated -1.To calculate the WUI Response Index, the WUI housing density data was combined with Flame Length data and response functions were defined to represent potential impacts. The response functions were defined by a team of experts based on values defined by the SWRA Update technical team. By combining flame length with the WUI housing density data, you can determine where the greatest potential impact to homes and people is likely to occur. Fire intensity data is modeled to incorporate penetration into urban fringe areas so that outputs better reflect real world conditions for fire spread and impact in urban interface areas. With this enhancement houses in urban areas adjacent to wildland fuels are incorporated into the WUI risk modeling. All areas in the South have the WUI Response Index calculated consistently, which allows for comparison and ordination of areas across the entire state. The risk output maps are derived at a 30 meter resolution. This scale of data was chosen to be consistent with the accuracy of the primary surface fuels dataset used in the assessment. While not appropriate for site specific analysis, it is appropriate for regional, county or local protection mitigation or prevention planning.

Copyright Text: Southern Wildfire Risk Assessment (SWRA 2010)

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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Value ( type: esriFieldTypeInteger, alias: Value )
• Count ( type: esriFieldTypeDouble, alias: Count )
• WildFire_Risk_Scale ( type: esriFieldTypeString, alias: WildFire_Risk_Scale, length: 255 )
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• WILDFIRESC ( type: esriFieldTypeSmallInteger, alias: WILDFIRESC )

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