Quantified Tree Risk Assessment (QTRA)
The Quantified Tree Risk Assessment (QTRA) system applies established and accepted risk management principles to tree safety management. 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.
Wharton is a Licensed User of QTRA, which is implemented where appropriate. Additionally Wharton implements other hazard rating systems where the use of QTRA is not considered appropriate. Alternative solutions follow industry best practice and guidance will be discussed with clients prior to any formal instruction.