BMP - Utility Tree Risk Assessment - 10

when a load or force is applied that exceeds the strength of one or more of
its parts.
Many tree failures involve a combination of structural defects and/or conditions, such as the presence of decay or poor structure, and a loading event,
such as a strong wind. However, a significant number of tree strikes to overhead lines involve trees with no apparent indication of defect prior to their
failure. Failure patterns within a species are often similar. For example,
fast-growing trees tend to have shorter life spans and are generally weaker
than slower-growing species.

Defects and Site Conditions That Increase the Likelihood for Tree Failure
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10

Standing dead trees and dead parts of trees
Broken and/or hanging branches
Cracks
Weakly attached branches or codominant stems
Decayed, damaged, or missing wood due to disease, insects, or fire
Abnormal tree architecture, such as excessive lean, low live crown ratio
(LCR), poor taper, excessive slenderness, and high height/diameter ratio
that is typical of suppressed or intermediate stems within a forest stand
Shallow soils and restricted root systems that cause a loss of root support
Site condition that recently changed creating a newly exposed edge to an
existing stand
Areas that have experienced previous tree failures



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
BMP - Utility Tree Risk Assessment - ii
BMP - Utility Tree Risk Assessment - Table of Contents
BMP - Utility Tree Risk Assessment - iv
BMP - Utility Tree Risk Assessment - v
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BMP - Utility Tree Risk Assessment - Cover4
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