Multi-trunk trees, also known as multi-stemmed trees, with a union above the existing grade is measured by the following steps:
- Measure the diameter of each trunk at 4.5 feet in height above the ground
- Add the diameter measure measurement of each trunk and use the sum to determine trunk diameter.
Multi-stemmed trees with a union occurring below the existing grade shall be considered individual trees and diameter measurements will be taken for each individual stem to determine trunk diameter – independent of the other stem diameters.