BMP - Utility Tree Risk Assessment - 13

5. Levels and Scope
of Tree Risk Assessment
Tree risk assessments can be conducted at different levels, appropriate for
the assignment, employing various tools and techniques. Three levels of tree
risk assessment are defined in ANSI A300 Part 9:
* Level 1-Limited Visual
* Level 2-Basic
* Level 3-Advanced
A Limited Visual assessment (Level 1) is a visual assessment from a
specified perspective such as foot, vehicle, or aerial patrol of an individual
tree or a population of trees near specified targets to identify specified conditions or obvious defects.
A Basic assessment (Level 2) is a detailed visual inspection of a tree and
surrounding site that may include the use of simple tools. It requires that a
tree risk assessor walk completely around the tree trunk, looking at the site,
aboveground roots, trunk, and branches.
An Advanced assessment (Level 3) is an assessment performed to
provide detailed information about specific tree parts, defects, targets, or
site conditions; specialized equipment, data collection and analysis, and
expertise are usually required.

Level 1: Limited Visual Risk Assessment

Level 1 risk assessment is a visual assessment from a specified perspective of
an individual tree or a population of trees near specified targets. They are
conducted to identify obvious defects or conditions that are likely to result
in a tree or tree part failure within the defined time frame. One or two of
the three factors assessed during a Limited Visual tree risk assessment (likelihood of failure, likelihood of impact, consequences) may be held constant.
For example, if assessing edge trees on a single-phase distribution line, the
likelihood of impacting the target and the consequences of the line strike
might be assumed to be the same for each tree on a line segment of a circuit;
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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
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