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Quantified tree risk assessment. Simply Balancing Risks With Benefits. What is QTRa? Tree safety management is a matter of limiting the risk of harm from tree failure while maintaining the benefits conferred by trees. Although it may seem counterintuitive, the condition of trees should not be the first consideration.
Using a comprehensive range of values1, Quantified Tree Risk Assessment (QTRA) enables the tree assessor to identify and analyse the risk from tree failure in three key stages.
Quantified tree risk assessment provides a frame-work for the assessment of the three components of tree failure risk—target value, probability of failure, and impact potential.
The Quantified Tree Risk Assessment (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
The Quantified Tree Risk Assessment Practice Note is a technical summary of the QTRA method as it is currently practised and includes guidance on how risk assessments can inform the management of risks from falling trees.
QUANTIFIED TREE RISK ASSESSMENT. The Quantified Tree Risk Assessment system was developed in 1996 and formed the foundation for tree risk management training delivered by the author from the late 1990s through to 2005 when a technical paper describing the method was published.
Tree risk assessments are fundamentally based on a relatively simple methodology, essentially the risk assessment requires inputs derived from: is there a hazard (defect) and how likely is it to fail. is there risk target and how much time is it there. and finally how much damage could it cause.