In this subtitle, the following terms have the meanings indicated. “Breast height” means 4.5 feet off of the ground. “Caliper inch” means 6 inches off of the ground. “Inch-for-inch replacement” means the tree removal and replacement standard used by the Department of Recreation and Parks that requires a person to plant a tree or trees with an equal or greater sum diameter, as measured in inches, to the sum diameter of all trees removed by that person, as measured in inches. “Permit holder” means a person to whom the Department of Recreation and Parks has issued a written permit to remove a tree under subsection (c) of <cite data-path="7|§53-15">§ 53-15 {“Tree Removal - Street”}</cite> or <cite data-path="7|§53-16">§ 53-16 {“Tree Removal - Parks”}</cite> of this subtitle. “Root zone” means a circular region, measured outward from a tree’s trunk, that represents the essential area of the tree’s roots that must be maintained or protected for the tree’s survival. The word “trees”, as used in this subtitle, shall not be construed to include shrubs that do not grow higher than 15 feet. City Code, 1927, art. 45, §185 1950, art. 35, §101 1966, art. 26, §104 1976/83, art. 26 § 109 Ord. 12-154 Ord. 46-396 Ord. 22-125