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• Critical Root Zone (CRZ) an area around a tree that is regulated by the Indian River County Land Development Regulations for the purpose of protecting the roots and trunk of a protected tree or a specimen tree, both during and after construction. It is a circular area using a radius measured from the center of the tree. The radius is calculated as one (1) foot of radius for each one (1) inch of diameter at breast height (4.5 feet above grade). For any fraction of a foot over a whole foot the diameter at breast height will be rounded up to the next whole number. Example: a tree has a diameter at breast height of 211/4 inches; the CRZ is a circle, centered on the center of the tree, with a radius of 22 feet. Diameter at breast height (dbh) the standard measure of a single -stemmed tree at four and one- half (4.5) feet above grade. When a tree has grown with cluster stems at breast height, dbh shall be equal to the sum et -aggregate of the diameters individual stems measured at four and one-half (4 1/2) feet above grade. The dbh shall be measured b takin! the circumference of the stem s /trunk s and a..1 'n the formula d = c/n where d is the diameter (in inches), c is the circumference (in inches), and n = 3.14. As an example: a single trunk tree has a circumference of 4 feet 5 inches (53 inches) measured 4.5 feet above the • ound. The dbh of the tree is then calculated as d = 53/3.14 = 16.9 inches. The dbh value shall be ex.ressed in inches and shall be scientificall rounded to one decimal .lace. Tree, protected any tree having a dbh of four (4) inches or more, but less than 24 inches, all • • = - ,. This shall also include and all each tree, regardless of the dbh of the individual tree within a significant groupings of trees of West Indian or tropical origin_ of it and -all • - - , The following trees, regardless of size or location shall not be considered to be protected trees: Casuarina cunninghamiana - Australian pine Casuarina lepidophlia - Australian pine Enterolobium cyclocarpum — a unt• lj , _nom Earpod Melia azedarch - Chinaberry Schinus terebinthifolius - Brazilian pepper tree Melaleuca quinquenervia - Melaleuca, punk or paper tree Cabbage palms (Sabal palmetto) and citrus trees of all varieties shall not be considered to be protected trees, but such trees shall be included in a tree survey in the event the applicant chooses to make use of said trees as a credit against the trees otherwise required under an applicable landscaping regulation or requirement. Tree, Specimen a tree which has a diameter at breast height (dbh) of 24 inches or greater excluding, however, the following trees, r gardless of size or location: Casuarina cunninghamiana - Australian pine Casuarina lepidophlia - Australian pine Enterolobium cyclocarpum — Austr l'p„_P-ine Earpod Melia azedarch - Chinaberry Schinus terebinthifolius - Brazilian pepper tree Melaleuca quinquenervia - Melaleuca, punk or paper tree • NOVEMBER 12, 2002 68 • • •