BMP - Utility Tree Risk Assessment - 53

10. Limitations of Tree Risk
Assessment
Limitations of tree risk assessment arise from uncertainties related to tree
characteristics and the loads to which they are subjected, as well as site conditions. The scientific study of tree failure is relatively young, and some conditions/characteristics cannot be reliably predicted with confident accuracy.
As an example, there are advanced techniques for determining wood condition, but specific wind speeds and/or wind direction that lead to tree failure
are less certain.
Tree risk assessors perform assessments with limited information about the
structural condition of the tree itself and the environment that affects it. For
instance, root decay may be present but not visible at the time of the assessment. Similarly, abnormally strong winds that create loads greater than the
tree can resist are not always predictable. Experience, training, and education
influence how the tree risk assessor sees the situation and analyzes it to form
an opinion about what is likely to occur in the future.
Tree risk assessors should include the limitations of their assessments in their
risk assessment report, including the limitations of the methodology used and
any limitations related to the ability to access or assess the tree, site, or potential targets.
Some of the limitations that are common to UTRA reports include:
* Tree risk assessment is limited in scope to the specific risk(s) to
utility infrastructure, not any and all risks to all potential targets.
* Only obvious defects and conditions visible to the utility tree risk
assessor from the side of the tree inspected can be discovered.
* Tree risk assessments only represent the condition of the tree at
the time of inspection.
* Not all defects are detectable and not all failures are predictable.
* The assessment time frame for risk categorization should not be
considered a " guarantee period " for the risk assessment.
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BMP - Utility Tree Risk Assessment

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

Table of Contents
BMP - Utility Tree Risk Assessment - Cover1
BMP - Utility Tree Risk Assessment - Cover2
BMP - Utility Tree Risk Assessment - i
BMP - Utility Tree Risk Assessment - ii
BMP - Utility Tree Risk Assessment - Table of Contents
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BMP - Utility Tree Risk Assessment - Cover4
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