Critical Root Zone

Also referred to as CRZ. The distance from the trunk of the tree is regulated.


The measurement across the width of the tree trunk. To calculate the diameter of a tree, measure the circumference (around the tree) and divide by 3.14.

Heritage Tree

Any of the following tree species when it measures 24 inches in diameter or greater: Texas Ash, Bald Cypress, American Elm, Cedar Elm, Texas Madrone, Bigtooth Maple, Pecan, Arizona Walnut, Eastern Black Walnut, and all Oak Trees. 

Protected Tree

A Protected tree is any tree with a diameter of 19 inches or greater when measured 4.5 feet above the ground. TIP: If you wrap your arms around a tree and your hands don't overlap, it is likely a Protected tree.

What is a protected tree?


Tree Ordinance Review Application (TORA) 

A Tree Ordinance Review Application (TORA) is an application for a permit to remove or build near a regulated tree. A TORA may be completed as part of another application process, such as a building permit, or on its own, as in the case of a dead or diseased tree.