BMP - Tree Risk Assessment - 14
Level 1: Limited Visual Assessment Process
The process of limited visual assessment should:
* Identify the location and/or selection criteria of trees to be assessed.
* Determine the most efficient route and document the route taken.
* Assess the tree(s) of concern from the defined perspective (for
example, walk-by or drive-by).
* Record locations of trees that meet the defined criteria (for example,
significant defects or other conditions of concern, trees that require
mitigation, or trees that require a higher level of assessment).
* Evaluate the risk based on observations and assumptions (a risk rating
is optional).
* Identify trees needing a higher level of assessment or prompt action.
* Submit recommendations or report.
A Level 1 assessment usually focuses on identifying trees with imminent
and/or probable likelihood of failure that are adjacent to specific pre-defined
targets and could impact the target(s). Using another example, in a Level
1 risk assessment along a utility line, the assessor would pre-define the
target as the electrical conductor, and would identify trees likely to fail and
impact the target. In this example, the consequence of failure-disruption
of electrical services-is held constant.
Limited visual assessments are the fastest, but least thorough, means of assessment and are intended primarily for quick assessment of large populations
of trees. When conducted by trained professionals, limited visual assessments
can provide tree managers with an adequate level of information that can accomplish their risk management goals. These assessments are often done on a
specified schedule, or may be done immediately after storms to rapidly assess
a tree population.
A limited visual assessment, performed from one side or by an aerial
flyover, typically looks for obvious defects such as dead trees, large cavity
openings, large dead or broken branches, fungal fruiting structures, large
cracks, and severe or uncorrected leans. In addition, the client may specify
certain conditions of concern, such as lethal pests or symptoms associated
with root decay.
The scope of work should specify the perspective or type of inspection.
The type of inspection may include one of the following:
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BMP - Tree Risk Assessment
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