TPZ & SRZ Calculator
TPZ: A tree protection zone is calculated (DBH × 12) to establish the acceptable proximity of works, equipment, and construction practices/procedures from an existing tree. This measurement represents a radius from the centre of the tree trunk and encompasses both below and above ground aspects.
SRZ: Structural Root Zone (SRZ) refers to the structural roots within closer vicinity to the trunk which are required by the tree to remain upright. Encroachment into the SRZ of an existing tree is not permitted without authorization. Root cuts conducted within the SRZ may destabilise the tree, requiring removal to avoid subsequent tree failure.
SRZ: Structural Root Zone (SRZ) refers to the structural roots within closer vicinity to the trunk which are required by the tree to remain upright. Encroachment into the SRZ of an existing tree is not permitted without authorization. Root cuts conducted within the SRZ may destabilise the tree, requiring removal to avoid subsequent tree failure.