This is a revealing tree risk assessment case study.
TRAQ, QTRA, and VALID tree risk assessment were carried out on the same Pine trees in Western Springs, Auckland, NZ.
It involves around 200 Pinus radiata. The trees of particular interest are those that could fall onto a footpath or property.
The reports are linked.
ISA TRAQ | August 2019
Risk Ratings
1 Extreme
1 High-Extreme
7 High
1 Medium-High
36 Medium
23 Low-Medium
148 Low
QTRA | December 2019
Risk of Harm for 15 trees of most concern
4 1/30,000
7 1/300,000
1 1/500,000
2 <1/1,000,000
Random tree part or tree onto footpath
1/400,000 (Size Range 4)
1/500,000 (Size Range 3)
1/1,000,000 (Size Range 2)
<1/1,000,000 (Size Range1)
VALID Report | October 2020
VALID Data
Risk
1 Not Acceptable
50 Not Tolerable
6 Tolerable
141 Acceptable
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