Materials and products that are buoyant, flammable, or explosive, or that in times of flooding could be injurious to human, animal, or plant life may not be stored below the flood-protection elevation. City Code, 1976/83, art. 7, §5(a)(11) 2000, art. 7, §3-11 Ord. 88-188 Ord. 11-516 Ord. 14-208 Ord. 21-020