Quantified Tree Risk Assessment (QTRA)

The Quantified Tree Risk Assessment (QTRA) system applies established and accepted risk management principles to tree safety management.

Firstly, the targets upon which trees could fail are assessed and quantified, thus enabling tree managers to determine whether or not and to what degree of rigour a survey or inspection of the trees is required. Where necessary, the tree or branch is then considered in terms of both impact potential (size) and probability of failure. Values derived from the assessment of these three components are used to calculate the probability of significant harm occurring.

The system moves the management of tree safety away from labelling trees as either ‘safe’ or ‘unsafe’ and thereby away from requiring definitive judgements of either tree surveyors or tree managers. Instead, QTRA quantifies the risk of significant harm from tree failure in a way that enables tree managers to balance safety with tree values and operate to a predetermined limit of reasonable or acceptable risk. QTRA

SJ Stephens Associates are Licensed Users of the system.