BMP - Tree Risk Assessment - 9

porting the tree. Even a structurally strong tree will fail when a load or force
is applied that exceeds the strength of one or more of its parts.
Most tree structural failures involve a combination of structural defects
and/or conditions, such as the presence of decay or poor structure, and a
loading event, such as a strong wind.
Major Defects and Conditions That Increase Potential
for Tree Failure
* Dead parts
* Broken and/or hanging branches
* Cracks
* Weakly attached branches and codominant stems
* Decayed or missing wood (mechanical damage or cankers)
* Unusual tree architecture (lean, balance, branch
distribution, and lack of taper)
* Loss of root support
The severity of each defect depends on the loads to which it is
exposed and the degree of response growth present.

Approaches to Risk Assessment
Before a tree risk assessment takes place, it is important to establish the
context of the assignment. Context defines the parameters of the risk assessment including objectives, how risk will be evaluated, communication flow,
applicable policies or legal requirements, and limitations of the risk assessment. Tree risk assessment is the systematic process to identify, analyze, and
evaluate tree risk. The manner in which this process is applied depends on
the context and the methods used to carry out the risk assessment.
The two primary approaches to risk assessment are quantitative and
qualitative. Each has advantages and limitations, and each may be appropriate
with different objectives, requirements, resources, and uncertainties. Both
quantitative and qualitative approaches are valid when applied properly with
reliable data and valid assumptions. With training and experience, reliability
can be improved for each approach.

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BMP - Tree Risk Assessment

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

Table of Contents
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