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Illustration of Terms

Levels of Damage

This table summarizes the expected levels of damage (uprooting or stem breakage) due to endemic peak winds along cutblock boundaries with a high treatment risk (downwind end of opening and at right angles to dominant wind direction), or to dispersed residual trees in uniform partial cuts.

Biophysical hazard class

Expected damage on ‘high’ treatment risk boundary
or in partial cuts

None

No stand present to be damaged by winds, or no damage expected.

Low

Little or no damage. Less than 10% of trees damaged within first tree length of cutblock edge, or within partial cut.

Moderate

Partial damage. Between 10 and 70% of trees damaged within first tree length of cutblock edge. 10–30% of trees damaged within partial cut.

High

Heavy damage. More than 70% of trees damaged in first tree length. 30–70% of trees damaged within partial cut.

Very High

Very severe damage. More than 70% of trees within the first and second tree lengths of cutblock edge. More than 70% of trees damaged within partial cut.

 
Forest Service BC
 
Forest Renewal BC