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Unit 11: Fire Behavior Prediction Systems

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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

Effects of Slope

Effects of Slope

Fuel moisture effect on ignition
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: This work is licensed under a Creative Commons License Creative Commons License