It is unlawful to construct or maintain any dam or obstruction in or across any public wastewater or storm water ditch, channel or gutter in this city, or to construct or maintain over or across any such ditch, channel or gutter, any bridge, crossing or covering without permission being first obtained from the city manager. Such permission shall not unreasonably be withheld, and shall be granted only upon such conditions as are necessary to protect the public health, safety and general welfare. (Ord. 1931 § 14, 1986: prior code § 75010)