BMP - Tree Risk Assessment - 24
Electric lines and facilities are targets of great importance to electrical
utility risk managers and users of electric power. Electric lines brought down
by a falling tree can be a threat to people who make contact with them; they
can cause large fires; and the costs, inconvenience, and possible losses associated with disruption of service can be significant.
Targets can be categorized by their ability
to move or be moved.
A static target is one
that is fixed or not readily moved. Examples
include buildings, utility facilities, or other
structures. Movable targets are those that can
be relocated, such as
sculptures, picnic tables,
parked cars, or swing
sets. A mobile target is
one that is in motion
or intermittently moving. Examples include
3. Targets. Risk targets are people, property, or
pedestrians, bikes, and Figure
activities that could be injured, damaged, or disrupted
vehicles on a sidewalk, by a tree. If this large tree were to fail at the root system,
targets would include the pedestrians, food vendors,
footpath, or road.
Known targets are traffic, parked cars, power lines, and the house.
those visible to the arborist, and those that the arborist has been told about by the client. It is
preferable to consider targets in consultation with the client, so that targets
that are not present at the time of the assessment may be included. The scope
of work should define targets of concern and often may consider only highvalue targets (e.g., people, houses, or power lines).
Target Zone
The target zone is the area that the tree or tree part is likely to hit if it fails.
When determining the target zone, the assessor considers the direction of
fall, the height of the tree, crown spread, slope of land, wind, potential for
dead branch shattering, or other factors that might affect spread of debris. The
target zone guideline for a whole-tree failure is often a circle around the tree
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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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