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Table 2—Modules in BehavePlus are groupings of related mathematical fire models. <br />Module <br />Calculations <br />Linkages <br />SURFACE <br />• Surface fire rate of spread <br />• Fireline intensity and flame length <br />• Reaction intensity and heat per unit area <br />. Intermediate values: heat source, heat sink, <br />characteristic dead fuel moisture, relative packing <br />ratio, etc. <br />Standard, custom, and special case fuel models <br />• Wind adjustment factor <br />CROWN <br />• Transition from surface to crown fire <br />• Surface fireline intensity or flame <br />• Crown fire rate of spread <br />length can come from SURFACE <br />• Crown fire area and perimeter <br />• Surface fire heat per unit area can come <br />• Fire type: surface, torching, conditional crown, <br />from SURFACE <br />or crowning <br />• Crown fire intensity and flame length <br />• Power of the fire, power of the wind <br />SAFETY <br />• Safety zone size based on flame length <br />. Head fire flame length can come from <br />• Area, perimeter, and separation distance <br />SURFACE <br />SIZE <br />■ Elliptically shaped point source fire <br />• Head fire rate of spread and effective <br />• Area, perimeter, and shape <br />wind speed can come from SURFACE <br />CONTAIN <br />• Fire containment success for single or multiple <br />• Head fire rate of spread can come from <br />resources given line construction rate, arrival <br />SURFACE <br />time, resource duration, head or rear attack, and <br />• Length -to -width ratio and fire size at <br />direct or parallel attack <br />report can come from SIZE <br />e Final area and perimeter, fire size at initial attack, <br />and fireline constructed <br />SPOT <br />■ Maximum spotting distance from torching trees, <br />• Head fire flame length can come from <br />burning piles, or wind -driven surface fire <br />SURFACE for wind -driven surface fire <br />SCORCH <br />• Crown scorch height from surface fire flame <br />• Surface fireline intensity or flame <br />length <br />length can come from SURFACE <br />MORTALITY <br />. Probability of mortality from bark thickness and <br />Scorch height can come from <br />crown scorch <br />SCORCH <br />IGNITE <br />• Probability of ignition by firebrands <br />• Probability of ignition from lightning strikes <br />USDA Forest Senrice Gen. Tech. Rep. RMRS-GTR-249. 2010 <br />