BMP - Tree Risk Assessment - 46

Pruning. Dead, dying, and weakly attached branches can be pruned
in accordance with the applicable national pruning standards or ISA's Best
Management Practices: Tree Pruning. Wind resistance can be reduced with
reduction pruning and, to some extent, thinning. Topping is not recommended
due to the long-term problems with weak sprouts and the entry of wood decay
fungi. Crown raising can eliminate lower branches that could be interfering
with structures, pedestrian or vehicle traffic, signs, or safe views. Excessive
raising, however, can reduce taper development, change sway patterns, and
limit the tree's ability to damp the effect of dynamic wind loading.
Installing structural support systems. Structural support systems can be
installed to limit movement of certain tree parts. Various types of hardware
are used, depending upon the goals. Examples include:
*
*
*
*

Cables (flexible braces) installed in the upper crown to limit the
movement of weak unions or codominant stems.
Brace rods (rigid braces) installed close to or through weak unions,
or through split sections.
Guys installed to improve anchorage and stabilize lean.
Props installed to support some leaning trees and low branches from
below.

Adding lightning protection for susceptible trees in significant- and
severe-consequence locations.
Modifying the site to improve conditions for the tree (for example, to
provide drainage to reduce failure associated with wet soil). Increasing tree
vitality can allow time for the tree's response growth to mitigate risk of failure.
Using a tree growth regulator (TGR) in conjunction with pruning
may extend the reduction in wind resistance or clearance from utilities and
structures for several years.
Use of tree growth regulators and modification of the site to improve
conditions should be considered long-term mitigation measures. While they
can be effective in reducing long-term risk, they should not be implemented
to achieve immediate risk reduction.
In some low-use locations, dead and decaying trees may be retained for
wildlife habitat or other uses. Selection of suitable wildlife habitat trees must
consider the tree's risk, as well as its value for wildlife. One management
strategy is to ensure that wildlife habitat trees are maintained at a height
shorter than the distance to the nearest target.

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BMP - Tree Risk Assessment

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

Table of Contents
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