Part 1: Introduction > Predicting Surface Fire Behavior

Predicting Surface Fire Behavior FCCS uses a modified Rothermel spread equation to predict surface fire behavior from realistic fuels.  Surface fire behavior outputs include: Reaction intensity (BTU ft2 min-1) Rate of spread (ft min-1) Flame length (ft) For additional information on the modified Rothermel spread equation, please see:   http://www.fs.fed.us/pnw/fera/publications/fulltext/fccs_cjfr/sandbergetal2007a.pdf