Horizontal movement rate

n. Rate of spread corrected to the horizontal.


  • Discussion


Fire behavior simulations that rely on Rothermel's (1972) surface fire spread model simulate rate of spread along the slope. Horizontal movement rate adjusts that value to the horizontal component as a function of slope steepness .


  • Units


    Horizontal movement rate has the same units as rate of spread.

    Preferred units for rate of spread are m/min in technical reports and papers. Fire Management in the United States still uses the English units ch/hr. See the following rate of spread units conversion table for conversion factors.


  • See Also

  • References

    • Rothermel, R.C. 1972. A mathematical model for predicting fire spread in wildland fuels. Res. Pap. INT-115. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station. 42 p.


  • Notes

    • Author 

      Joe Scott, Research Forester

      Systems for Environmental Management