BMP - Tree Risk Assessment - 59

Appendix 3
Structural Defects and Conditions That Affect
the Likelihood of Failure
Certain structural defects or conditions are more likely to lead to failure
than others. Individual defects or conditions may or may not, in and of
themselves, indicate a serious structural problem; but in combination, and
under additional loads, they may contribute to failure. On the other hand,
through response growth (see Appendix 4), trees can strengthen weak areas
and support loads, thereby reducing the likelihood of failure. A visual assessment includes looking for and determining the significance of each of
the structural conditions, individually and in combination, that increase and
decrease the likelihood of failure.
Some guidelines for classifying the likelihood of failure based on certain
defects and conditions are presented in this appendix. For the sake of comparison, the time frame has been standardized at three years. The assessor
should be mindful that these are general guidelines and are highly dependent

Figure A3-1. Tree risk assessors need to look for defects or conditions
that indicate a potential problem. Numerous conditions can be seen here,
including: a broken, hanging branch; a dead branch; a cracked branch; cavity
openings; root plate lifting; an over-extended branch; a weak branch union;
and severed roots.

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