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defined in terms of the likelihood of adverse exposure and potential consequences of such exposure. Qualitative risk assessment approaches are recognized and respected methods that are used internationally by many
governments and businesses.
Two limitations of the qualitative approach are (1) inherent subjectivity and
(2) ambiguity. In order to increase reliability and consistency of application,
it is important to provide clear explanations of the terminology and significance of the ratings defined for the likelihood of striking utility infrastructure,
the likelihood of tree failure, the consequences of a strike, and risk.
Assessment Approach to UTRA
There is typically a considerable level of uncertainty associated with tree risk
assessment due to our limited ability to predict natural processes (e.g., rate
of progression of decay, response growth), weather events, and potential
consequences of tree failure. Sources of uncertainty should be understood and
communicated with the utility vegetation manager and utility tree risk assessors.
A primary goal of UTRA is to provide the best information about the estimated level of risk posed to overhead lines by a tree within a specific time
frame. This is accomplished in qualitative tree risk assessment by considering
three factors:
1. Evaluating the likelihood that a failed tree or branch could strike an
overhead utility line
2. Evaluating the site and tree structural conditions to determine the
likelihood of failure, such as the potential loads on the tree and the
tree's adaptations to weaknesses1 within the specified time frame
3. Estimating the measurable consequences when assessing and categorizing the potential direct damage done to utility infrastructure
and other indirect outcomes that may occur as a result of a tree
strike or conductor contact
Ratings for the likelihood of striking a target, likelihood of tree failure, and
consequences of a target strike support estimation and categorization of risks.
1 Guidance for evaluating tree condition and assessing the likelihood of failure are presented in
Appendix 2 and 3 and in other publications (see Other Sources of Information).
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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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