The purpose of tree risk assessment is to inspect and assess, in detail, the health and structure of all tree parts, surrounding targets, and environmental conditions. This assessment will provide a report with options for mitigating / the reducing risks associated with the tree and the surrounding areas.

Tree Reports NSW are trained and qualified Consulting Arborists using two internationally recognised risk assessment methodologies.

 

Tree Risk Assessment Qualification (TRAQ)

The Tree Risk Categorisation in this case is a qualitative risk assessment used by qualified tree assessors in combination with a matrix to assign risk. The assessor considers possible targets, the target zone, occupancy rates, site-specific factors, tree species, noted defects and environmental factors within a specified period.  The tree assessor uses this information to categorise risk for the likelihood of failure, combined with the likelihood of impacting a target. These two categories make up the first table in the Tree Risk Matrix. The second table assesses the Tree Risk rating by combing the likelihood of failure and impact with the consequences of the branch or tree failing. The result is a risk rating of low, moderate, high, or severe.

 

Quantified Tree Risk Assessment (QTRA)

The QTRA method applies established and accepted risk management principles to tree safety management.  Firstly, the targets (people and property) onto which trees could fail are assessed and quantified, thus enabling tree managers to determine whether they need to assess trees and to what degree of rigour an assessment or inspection of the trees is required. Where necessary, a tree or branch is then considered in terms of both its size (potential impact) and probability of failure.  Values derived from the assessment of these three components (target, size, and probability of failure) are combined to calculate a risk of harm in a numerical value within the assessment period.

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Tree Reports NSW service include:

• Arborist reports

• Risk Assessment Reports

• Arboricultural statements

• Root crown investigation

• Advanced diagnostic testing - Sonic Tomography and/or Resistograph

• Aerial Inspections

• Dynamic tree support system - Cobra Tree Bracing System

• General tree enquiry and tree advice

• Referral to qualified tree workers to undertake specified tree works

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Internal Diagnosing Testing (Advanced)

Advanced Testing using Sonic Tomography and/or Resistograph

This advanced diagnostic testing enables us to visually see inside the tree, essentially ‘like an x-ray’ of the internal structure of the tree.