BMP - Tree Risk Assessment - 30

Figure 6. Likelihood of branch union failure is affected by the comparative size of the
two stems, the shape of the union, and the presence of included bark and cracks. For
these unions, the likelihood of failure increases from left to right.

Tree Species Failure Profiles
For many tree species and sites, there are recurring patterns of tree failure.
Species failure profiles provide information on the most likely failure points
in a tree species. Tree risk assessors can consider local species' failure patterns when performing tree risk assessments. Knowing the most common
ways in which a species fails can aid in determining when a higher level
of assessment may be needed. For example, with species that have failure
patterns associated with root decay, a visual assessment may not reveal the
defect; therefore, it may be appropriate, in some instances, to recommend a
higher level of assessment.
Failure profiles also may aid in the identification of species that fail at a
low wind speed and those that can withstand high wind speeds or other loads.
For example, some species can have codominant branch failures at wind
speeds as low as 35 mph (56 km/h), so failure of species with that condition
is more likely than it is for most other species.
Failure profiles can be developed locally, identified using the International
Tree Failure Database, or they may be derived from other sources. The tree
risk assessor must keep in mind that tree failure profiles are an aid during
analysis, but they do not substitute for working through the steps of the
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BMP - Tree Risk Assessment

Table of Contents for the Digital Edition of BMP - Tree Risk Assessment

Table of Contents
BMP - Tree Risk Assessment - Cover1
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BMP - Tree Risk Assessment - i
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