It is unlawful as a normal practice for any person, firm or city department to top any street tree, park tree or any other tree on public property. Trees severely damaged by storms or other causes, or certain trees under utility wires or other obstructions, where other pruning practices are impractical may be exempted from this chapter at the determination of the tree board. (Ord. G-786 § 2 (part), 1994: prior code § 16-120)