Critical root zone

Critical root zone

The area of undisturbed natural soil around a tree defined by a concentric circle. A code-based standard for site design and/or construction practices, used in site plan review by planning departments of municipal and county governments. Also called tree protection zone.
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To determine how the root damage might affect the health of the tree, a professional arborist can estimate how much of the rooting area was affected within the critical root zone (CRZ), a circular area around the stem of the tree, usually smaller than the area defined by the outer reaches of the tree's branches, known as the drip line.
You can look up CRZ (Critical Root Zone) areas and issues on the Internet if you want to follow up more about root impacts and how to reduce damages to trees.
The consultants plotted each tree's critical root zone and measured the height of its limbs above the street.
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