(A) Culverts under driveway entrances for roadside ditches shall be adequate to carry the design flow but shall not be less than 12 inches inside diameter.
(B) Culverts crossing streets shall be of a size adequate to carry the design flow but shall not be smaller than 18 inches inside diameter.
(C) All galvanized corrugated metal pipe intended for use within the roadway shall be bituminous coated and shall be of the gauge recommended by the Engineering Division for the cover and service conditions required. Additional protective coatings or paving may be required for severe service conditions. The gauge of pipe proposed at each location shall be noted on the improvement plan.
(D) Culverts for use outside the roadway may be of any approved type and strength to meet field conditions.
(E) Roadside ditch sections shall be subject to the approval of the City Engineer as to shape, size, gradient, lining, and location within the road right-of-way and shall have the required hydraulic capacity.
(F) Roadside ditches and gutter shall be provided to carry the drainage from the road and tributary lands without damage to the roadbed or abutting property.
(G) The maximum gradient for earth ditches shall not exceed 4% nor be less than 1%. The minimum gradient for lined or paved ditches shall not be less that 0.5%.
(H) The edge of the earth ditch nearest the pavement shall not be closer than three feet to the outer edge of the paved shoulder of the road.
(I) Drainage within the street right-of-way, but outside the surfaced area, shall be controlled to prevent erosion.
(J) Catch basins shall be of the design approved by the City Engineer. Inlets shall be so designed that water shall be diverted into the catch basins without a reversal of direction of the flow of the water.
(K) Drainage structures shall account for tidal action and flood stage where applicable. Drainage shall be accomplished by gravity without surcharge in catch basins. The tops of curbs shall be located at an elevation 10 feet or higher above mean sea level as per United States Geological Survey, 1929 sea level datum.
('66 Code, § 9-4.623) (Ord. 275-C-S, passed 3-11-75) Penalty, see § 9-4.903