![]() ![]() Then measure outwards from the trunk 1.5 feet for every inch DBH. To find the size of the CRZ circle when the ratio is 1:1.5, measure the trunk 4.5 feet above the ground, called diameter at breast height (DBH).Most municipalities define a legal CRZ as a circle with a 1, 1.25- or 1.5-foot radius for each inch diameter of the trunk. A legal CRZ area is determined by using a formula based on a tree’s trunk diameter, as defined in municipal codes.There are two ways of finding the size of a CRZ: ![]() The minimum amount of roots trees need for survival are called the “ critical roots.” These critical roots exist in the soil surrounding the tree, called the “Critical Root Zone,” or CRZ. Roots do this by providing trees with stability, access to water, access to nutrients, and cultivating symbiotic relationships with beneficial soil biota. Did you know that a tree's roots extend out 2-3 times as tall as the tree? Trees need roots in order to stay alive, remain upright, grow larger, reproduce, and defend themselves from pests, pathogens, and decay. When doing any type of construction work around existing trees, it is important to protect tree roots from harm.
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