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11. Recommendations for reassessment (interval, level, and type).
12. Limitations of the assessment.
For populations of trees, the report also may suggest priorities for mitigation.
That information, plus any additional information, can be included in a multiyear, large-area management plan, if that is required by the scope of work.
Limitations of Tree Risk Assessment
Limitations of tree risk assessment arise from uncertainties related to trees
and the loads to which they are subjected. The scientific study of tree failure
is relatively young; there is still much to learn. As an example, there are advanced techniques for determining wood condition, but specific wind speeds
and/or wind direction that will cause a specific tree to fail are unknown.
Tree risk assessors perform assessments with limited information about
the structural condition of the tree itself and the environment that affects it.
For instance, root decay may be present but not visible at the time of the
assessment. Similarly, abnormally extreme winds that create loads greater
than the tree can bear are not always predictable. Experience, training, and
education influence how the tree risk assessor sees the situation and analyzes
it to form an opinion about what is likely to occur in the future.
Tree risk assessors should include the limitations of their assessments
in their risk assessment report, including the limitations of the methodology
used, and any limitations related to the ability to access or assess the tree,
site, or potential targets.
Some of the limitations that are common to risk assessment reports
include:
* Tree risk assessment is limited in scope to the specific risk(s) of interest, not any and all risks.
* Tree risk assessment considers significant known and/or assigned
targets and visible or detectable tree conditions.
* Tree risk assessments represent the condition of the tree at the time
of inspection.
* Not all defects are detectable and not all failures are predictable.
* The time period for risk categorization should not be considered a
" guarantee period " for the risk assessment.
* Only those trees specified in the scope of work were assessed, and
assessments were performed within the limitations specified.
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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
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BMP - Tree Risk Assessment - Table of Contents
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