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# Unit 11: Fire Behavior Prediction Systems

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## Formulas

### Formulas for calculating adjusted fire behavior values:

ROS = Rate of spread for no wind or slope
FI = Fireline intensity for no wind or slope
WF = Wind factor
SF = Slope factor

 Adjusted rate of spread = (ROS x WF) + (ROS x SF) + ROS = ROS x (WF + SF + 1) = ROS x (effective windspeed factor + 1) = ROS x total correction factor

 Adjusted fireline intensity = (FI x WF) + (FI x SF) + FI = FI x (WF + SF + 1) = FI x (effective windspeed factor + 1) = FI x total correction factor

### Effects of slope on rate of spread

Fine fuel moisture effect on probability of ignition

Copyright 2008, by the Contributing Authors. Cite/attribute Resource . admin. (2005, November 16). Unit 11: Fire Behavior Prediction Systems. Retrieved January 07, 2011, from Free Online Course Materials — USU OpenCourseWare Web site: http://ocw.usu.edu/Forest__Range__and_Wildlife_Sciences/Wildland_Fire_Management_and_Planning/Unit_11__Fire_Behavior_Prediction_Systems_2.html. This work is licensed under a Creative Commons License