BMP - Utility Tree Risk Assessment - 11

4. 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,
and limitations and restrictions of the risk assessment. Tree risk assessment
is the systematic process to identify, analyze, and assess 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 methodology of the risk assessment selected should be appropriate to
the situation and should consider the goals and available resources. With the
context defined, the specific techniques should be selected based on the
following:
*
*
*
*
*
*

Ability of the assessment type and intensity to reasonably deliver
the desired result
Risk tolerance of the utility vegetation manager and the level of
detail required
Resource availability
Ability to determine what is practical given the potential consequences and ability to reasonably identify potential hazards
Availability of information and data
Expertise required

This BMP contains a matrix-based, qualitative approach to tree risk assessment, which is expanded for a more detailed explanation; however, quantitative assessments are not precluded from best management practices.
Whichever technique is chosen, the limitations should be recognized, as well
as the nature and degree of uncertainty in the data and available information.

Qualitative Risk Assessment

Qualitative risk assessment-as applied in this BMP-is the process of using
categorized ratings of the likelihood and consequences of an event to determine a risk level and evaluate it against the qualitative criteria. Often, ratings
are combined in a matrix to categorize the level of risk. In this case, risk is
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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
BMP - Utility Tree Risk Assessment - iv
BMP - Utility Tree Risk Assessment - v
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