City regulations require that all trees to be removed be evaluated to determine replacement inches. The evaluation determines the amount of inches that must be replaced. These inches must be qualified trees (PDF) at least 2 inches in diameter measured 6 inches above the ground. For every 10 inches of replacement inches required, the applicant must plant at least 1 4-inch diameter tree, or a 100-gallon tree of species class 1 or 2. More than 1 tree may be necessary depending on the amount of replacement inches. An option is available to donate money to the West University Tree Trust (PDF) if all replacement inches cannot be planted on the site. If a tree is considered dead, diseased, dying or hazardous then no replacement is required. Supporting documentation may be required in certain circumstances.