(a) Drainage Plan. A drainage plan shall be submitted simultaneously with the plat of any subdivision, showing the proposed scheme of surface drainage. All necessary facilities, including underground pipe, inlets, catch basins, or open drainage ditches, as determined by the City Engineer shall be installed to provide for the adequate disposal of sub-surface and surface water and maintenance of natural drainage courses. All storm drainage facilities within the subdivision shall connect to an adequate drainage course.
(b) Storm Drainage. A drainage system, conforming to the applicable provisions of Chapter 1155, Storm Water Management and Erosion and Sediment Control, shall be adequate to serve the needs of the proposed new streets and the entire subdivision. Where an adequate public storm sewer main is available at the plat boundary, the subdivider shall construct a storm sewer system and connect it to the public storm sewer main. If such storm sewer systems are not accessible, adequate storm water drainage shall be provided by natural drainage channels with easements of adequate width as determined by the City Engineer.
(c) Culverts and Bridges.
(1) Where required. When natural drainage channels intersect any street right of way, it shall be the responsibility of the subdivider to have satisfactory bridges and culverts designed and constructed.
(2) Culverts in streets. All culverts shall extend across the entire right-of-way width of the proposed road. The cover over the culvert and its capacity shall be determined by the City Engineer. The minimum diameter of a culvert pipe shall be eighteen (18) inches. Head walls depending on existing drainage conditions may be required.
(3) Driveway culverts. Driveway culverts shall have a minimum length of twenty (20) feet. The diameter of driveway culverts shall be subject to the determination of the City Engineer. The driveway culverts shall be laid so as to maintain the flow line of the ditch or gutter. Head walls may be required.
(4) Standards and Specifications. Standards and specifications for the construction of storm water drainage improvements shall conform to applicable provisions of Chapter 1155 Storm Water Management and Erosion and Sediment Control and approval by the City Engineer.
(Ord. 2020-4053. Passed 1-7-21.)