(a) An adequate drainage system, on all streets, including necessary open ditches, storm sewers, pipes, culverts, intersectional drains, drop inlets, bridges, etc., shall be provided for the proper drainage of all surface water. Culverts shall be provided to accommodate all natural water flow, and shall be of sufficient length to permit full width roadway, and the required slopes. The size openings to be provided shall be determined by Talbot's formula, but in no case shall the pipe be less than twelve inches. Culverts shall be built on straight line and grade, and shall be laid on a firm base but not on rock. Pipes shall be laid with the spigot end pointing in the direction of the flow and with the ends fitted and matched to provide tight joints and a smooth uniform invert. They shall be placed at a sufficient depth below the roadbed to avoid dangerous pressure of impact, and in no case shall the top of the pipe be less than one foot below the roadbed.
(b) Storm sewers shall be either bell and spigot or tongue and grooved pipe, either clay, concrete or plastic (SDR-35) and shall have a minimum length of thirty inches per unit. Size of storm sewer shall be approved by the Safety-Service Director or by the City Engineer, but in no case shall the sewer be less than eight inches in diameter.
(Ord. 920. Passed 7-23-56.)