The National fire-danger rating system: basic equations
Document Type: Book
Author(s): J. D. Cohen; J. E. Deeming
Publication Year: 1985

Cataloging Information

  • annual plants
  • brush
  • chaparral
  • computer programs
  • dead fuels
  • energy
  • fire danger rating
  • fire frequency
  • fire management
  • fuel accumulation
  • fuel appraisal
  • fuel loading
  • fuel management
  • fuel models
  • fuel moisture
  • fuel types
  • grasses
  • hardwoods
  • herbaceous vegetation
  • human caused fires
  • humidity
  • ignition
  • lightning caused fires
  • litter
  • live fuels
  • mortality
  • perennial plants
  • phenology
  • pine
  • plant physiology
  • precipitation
  • rate of spread
  • shrubs
  • slash
  • statistical analysis
  • temperature
  • tundra
  • wildfires
  • woody fuels
  • woody plants
Record Maintained By:
Record Last Modified: August 6, 2018
FRAMES Record Number: 34343
Tall Timbers Record Number: 8572
TTRS Location Status: In-file
TTRS Call Number: A13.88:PSW-82 DDW
TTRS Abstract Status: Fair use, Okay, Reproduced by permission

This bibliographic record was either created or modified by the Tall Timbers Research Station and Land Conservancy and is provided without charge to promote research and education in Fire Ecology. The E.V. Komarek Fire Ecology Database is the intellectual property of the Tall Timbers Research Station and Land Conservancy.


Updating the National Fire-Danger Rating System (NFDRS) was completed in 1977, and operational use of it was begun the next year. The System provides a guide to wildfire control and suppression by its indexes that measure the relative potential of initiating fires. Such fires do not behave erratically-they spread without spotting through continuous ground fuels. Estimates of fire potential have a basis in the mathematical models used for fire behavior. The fire manager must select the fuel model that best represents the fuels in the preotection area. Among the 20 fuel models available, not more than two or three are appropriate for any one area. This documentation of the 20 fuel models and their equations supplements previous reports on the System. The equations are presented in the coded format of FORTRAN and BASIC computer languages.

Cohen, J. D., and J. E. Deeming. 1985. The National fire-danger rating system: basic equations. General Technical Report PSW-82. Berkeley, CA, USDA Forest Service, Pacific Southwest Forest and Range Experiment Station.