BMP - Tree Risk Assessment - 8

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Consequences are the effects or outcome of an event. In tree risk
assessment, consequences include personal injury, property damage,
or disruption of activities due to the event.
Risk vs. Hazard

Arborists and foresters have used the term hazard assessment to describe
the process of inspecting and evaluating the structural condition of trees
and the harm that could occur in the event of failure. The more accurate and
appropriate term risk assessment is now standard.
Risk is the combination of the likelihood of an event and the severity of the
potential consequences.
A hazard is a likely source of harm. In relation to trees, a hazard is the tree
part(s) identified as a likely source of harm.
A tree is considered hazardous when it has been assessed and found to
be likely to fail and cause an unacceptable degree of injury, damage, or
disruption-that is, it poses a high or extreme risk.

Types of Risk Associated with Trees
Trees can pose a variety of risks, which are categorized into two basic groups:
conflicts and structural failures. The majority of this publication focuses on
structural failures of trees.

Conflicts

Risk can arise when there are conflicts between trees and societal functions.
As trees grow, they may produce potentially problematic flowers, fruit, roots,
branches, and leaves, and these may conflict with pavement, the structures
around them, and people. In some situations these conflicts can cause harm.
Conflict can also occur between power lines and trees. This contact can
interrupt power supplies, can propagate fires, and can injure or kill people.
Although not the focus of this BMP, more information on tree conflicts is
provided in Appendix 1.

Structural Failures

Tree failure is the breakage of stems, branches, or roots, or the loss of mechanical support from the root system. Structural failures occur when the
forces acting on a tree exceed the strength of the tree structure or soil sup8



BMP - Tree Risk Assessment

Table of Contents for the Digital Edition of BMP - Tree Risk Assessment

Table of Contents
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