These original 13 standard fire behavior fuel models serve as input to Rothermel's mathematical surface fire behavior and spread model. The 13 Anderson Fire Behavior Fuel Model (FBFM13) layer represents distinct distributions of fuel loading found among surface fuel components (live and dead), size classes, and fuel types. The fuel models are described by the most common fire-carrying fuel type (grass, brush, timber litter, or slash), loading and surface area-to-volume ratio by size class and component, fuelbed depth, and moisture of extinction.
FBFM13 was produced through a series of workshops held across the nation with fire and fuels specialists to determine surface fuel model rule sets using unique combinations of existing vegetation type, cover, and height. While the focus of the workshops were the FBFM40 models, the most representative FBFM13 was assigned based on the fire behavior characteristics of the assigned FBFM40 model.
The FBFM13 layer can serve as input to wildland fire prediction models.