The influence of insolation on fire hazard in coastal Douglas fir slash
Document Type: Book
Author(s): D. E. Williams
Publication Year: 1964

Cataloging Information

  • bark
  • British Columbia
  • Canada
  • cellulose
  • coniferous forests
  • fine fuels
  • fire danger rating
  • fuel management
  • fuel moisture
  • humidity
  • logging
  • moisture
  • precipitation
  • Pseudotsuga menziesii
  • season of fire
  • slash
  • statistical analysis
  • temperature
  • Thuja plicata
  • topography
  • Tsuga heterophylla
  • weather observations
Record Maintained By:
Record Last Modified: June 1, 2018
FRAMES Record Number: 39085
Tall Timbers Record Number: 13714
TTRS Location Status: In-file
TTRS Call Number: Fire File DDW
TTRS Abstract Status: Okay, Fair use, 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.


A study of the effects of exposure (aspect and slope angle) and natural shade on the moisture content of Douglas fir logging slash indicates that, throughout most of the fire season, such effects are not great enough to be of practical significance in slash hazard rating. In the latter part of the fire season, however, when slash burning is usually done, fuels on north-facing slopes and in partial shade have a significantly higher moisture content than fuels on level ground or south-facing slopes, and the rate at which they dry to a flammable state after a rain is much slower. This variation in fuel moisture with exposure can influence appreciably the behaviour of slash burns. Adjustments to the Slash Hazard Index (1) are suggested to compensate for these variations and thus improve the Hazard Index as a slash burning guide.

Williams, D. E. 1964. The influence of insolation on fire hazard in coastal Douglas fir slash. Publication No. 1060. Ottawa, Ontario, Department of Forestry, Forest Research Branch, Canada.