Home Course Map Resources Help Back 15 of 28 Next

Hazard Assessment

Windthrow Triangle Show Larger Image
Biophysical Hazard Assessment

Use the windthrow triangle to understand component hazards and to uncover the role they play in determining windthrow risk.

The diagnostic method described below is 'observational' but includes some elements of the empirical approach:

  • The environmental factors which affect the wind loading and wind resistance of stands can be divided into three groups: topographic exposure, soil, and stand factors.
  • These three groups or 'component hazards' form the three sides of the 'Windthrow Triangle.' Relative biophysical hazard for windthrow can be estimated by assessing each side of the triangle independently and then integrating the results.
  • The component hazards are assessed by asking 'diagnostic questions.'
  • While the triangle approach is simplistic, it provides a framework for the systematic observation of damage patterns and associations, which can lead to improved predictions.

Click on the windthrow triangle graphic to uncover more information about the relationship between these component hazards.

Forest Service BC
Forest Renewal BC