K - Preliminary Arborist Report (29.08.2019)

Figure 1.0 - source AS4970-2009 page 14. TPZ and SRZ overview




                                                                The TPZ for individual trees is
                                                                calculated based on trunk (stem)
                                                                diameter (DBH), measured at 1.4
                                                                metres up from ground level.

                                                                The radius of the TPZ is
                                                                calculated by multiplying the
                                                                tree’s DBH by 12.

                                                                For example; a tree with 40cm
                                                                DBH requires a TPZ of 4.8
                                                                metres.

                                                                The method provides a TPZ that
                                                                addresses both tree stability
                                                                and growth requirements. TPZ
                                                                distances are measured as a
                                                                radius from the centre of the
                                                                trunk at ground level.
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PAR: V2
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