Tree Risk Assessment | Case study

2020-11-06 10:54 AM | Admin (Administrator)

This makes for an interesting tree risk assessment case study.

A 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. From a risk of branch or tree failure perspective, the trees of particular interest are those that could fall onto a footpath or property.

The reports are linked.


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 | October 2020

Risk
1 Not Acceptable
50 Not Tolerable
6 Tolerable
141 Acceptable

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Contact: admin@validtreerisk.com

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