(a) All culverts shall extend not less than eighteen (18) feet on each side of the centerline of the street, measured at right angles to the centerlines; but they must extend between street side ditches.
(b) Pipe culverts under driveways shall not be less than twelve (12) inches in diameter and twenty-four (24) feet in length, shall be reinforced concrete or corrugated metal pipe and shall be laid so as to maintain the flowline of the ditch.
(c) All culverts shall be designed according to Manning's Formula and the Federal Highway Administration Nomographs and/or other approved methods. All calculations shall be shown.
(d) All storm water drainage improvements shall be in conformance with current "Construction and Material Specifications" of the Department of Transportation, State of Ohio, as they pertain to this type of improvement.