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.
References in periodicals archive ?
The consultants plotted each tree's critical root zone and measured the height of its limbs above the street.
Guidelines were developed for working in the critical root zone, requiring contractors to hand dig in this zone and saw cutting roots at a 90-degree angle (studies have shown that smooth-cut roots tend to branch out and grow vigorously after damage).
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