Just a quick note to remind you all that the canopies of tree’s do not necessarily represent the root protection area (RPA). This is a very common misconception which leaves to confusion throughout the planning process.
The RPAs are calculated using a formula based on trunk size, as this is a fair indication of the volume of the tree, both above and below ground. As you know, some trees have narrow canopies (lime, poplar, wellington, etc), and some broad (oak, beech, plane…). It is essential for canopies and RPAs to be accurately represented early on in the design process and mirrored on all working drawings. This avoids poorly positioned buildings, road, service runs, etc. and the costs associated with re-designs.
Similar trunk size but note the narrow canopy on the poplar (right).
