Tree Risk Assessment | Comparison Case Study - TRAQ, QTRA, and VALID

[Acer ventura]

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 can be downloaded from the News page of VALID’s website here;

 

Tree Risk Assessment Reports

 

 

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 is Tolerable (they’re ALARP)
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

 

Cheers

 

Acer Ventura
 

[Khriss]

Will look into this Ron.  K