Vehicular ways shall be graded and drained in such a manner that will not allow erosion or endanger the stability of any adjacent slope. Surface discharge onto adjoining property shall be controlled in such a manner that it does not cause erosion or endanger existing improvements. Bridges and culverts installed in watercourses shall be approved by the city engineer or his designee and shall be designed by a registered civil engineer to ensure structural and hydraulic adequacy. (Ord. 1523, 4-11-1995)