BMP - Tree Risk Assessment - 67

*

Bows are leans characterized by the top of the tree bending over more
than the lower trunk, creating a curve. Trees may develop this form
when growing at the edge of a group or next to structures. Such trees
are stable under normal conditions, but are less stable than straight
trees under additional loads.
Bows also may occur under snow or ice loading or during high winds.
Some trees never recover from or respond to this type of damage.
Bowed trees also should be examined for longitudinal cracks. The
likelihood of bowed tree failure may be possible to probable if it has
not increased the stem diameter by compensation growth. If cracks
are present, the likelihood of failure may be probable to imminent if
the tree is subjected to loads from wind, snow, or freezing rain.

Figure A3-2. The pattern of tree lean can affect the likelihood of failure. Illustrated here
from left to right are a straight lean, a bow, and a corrected lean or sweep.

*

One-sided or unbalanced crowns. Ideally, branches are evenly
distributed vertically and horizontally around the trunk. Trees with
even branch distribution tend to distribute the loads evenly along the
trunk, reducing the likelihood of trunk and root failure as compared
to trees with uneven branch distribution. A tree may have most of its
branches on one side if it is growing close to another tree or structure, has uneven crown dieback, is damaged by a storm, or has been
pruned in that manner. In most cases, trees develop response wood
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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
BMP - Tree Risk Assessment - Cover2
BMP - Tree Risk Assessment - i
BMP - Tree Risk Assessment - ii
BMP - Tree Risk Assessment - Table of Contents
BMP - Tree Risk Assessment - iv
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