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work. The assigned numbers, which are actually categorizations and do
not represent a quantitative mathematical relationship, are either added or
multiplied to develop an overall relative level of risk. Risk professionals
caution that addition or multiplication of these ordinal numbers is mathematically incorrect. Some of these systems were designed to estimate
level of risk for individual trees and others were designed to prioritize
work within a population of trees. If a qualitative numeric system is
employed, it should be used only for the intended purpose and with an
understanding of its limitations.
BMP Assessment Approach
The methodology of the risk assessment selected should be appropriate
to the situation and should consider the goals and the resources available. With the context defined, the specific techniques should be selected
based upon:
* Needs of the decision makers and the level of detail required
* Resources available and what is reasonable for the potential consequences
* Availability of information and data
* Expertise required
A matrix-based, qualitative approach to tree risk assessment has been selected
for expanded explanation in this guide, but quantitative assessments are not
precluded from best management practices. Whichever technique is chosen,
users should recognize the limitations as well as the nature and degree of
uncertainty in the data and information available.
There is typically a considerable level of uncertainty associated with
tree risk assessment due to our limited ability to predict natural processes
(rate of progression of decay, response growth, etc.), weather events, traffic
and occupancy rates, and potential consequences of tree failure. Sources of
uncertainty should be understood and communicated to the risk manager/
tree owner.
A primary goal of tree risk assessment is to provide information about the
level of risk posed by a tree over a specific time frame. This is accomplished
in qualitative tree risk assessment by first determining the categories for likelihood and consequences of tree failure. These two factors are determined by:
1. Evaluating the structural conditions that may lead to failure; the
potential loads on the tree; and the tree's adaptations to weaknesses-
to determine the likelihood of failure. Guidance for evaluating tree
11
BMP - Tree Risk Assessment
Table of Contents for the Digital Edition of BMP - Tree Risk Assessment
Table of Contents
BMP - Tree Risk Assessment - Cover1
BMP - Tree Risk Assessment - Cover2
BMP - Tree Risk Assessment - i
BMP - Tree Risk Assessment - ii
BMP - Tree Risk Assessment - Table of Contents
BMP - Tree Risk Assessment - iv
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