What method involves calculating the tree height for determining TPZs?

The method that involves calculating the tree height for determining Tree Protection Zones (TPZs) is the tree height method. This approach emphasizes the direct relationship between the height of a tree and the necessary protective area around its root system. By measuring the height of the tree, arborists can establish a radius that corresponds to the recommended protective zone. This is particularly important in urban settings where development may impact existing trees.

Using tree height is a well-recognized guideline in arboriculture, as the overall health and stability of a tree can be significantly influenced by its root system. The protective zone ensures that soil compaction, changes in grade, and other potential disturbances do not adversely affect the tree's health. Therefore, determining the TPZ based on tree height provides a scientifically backed, effective means of protecting trees during construction or other activities.