(A) All necessary facilities, including underground pipe, inlets, catch basins or open drainage ditches, as determined by the Planning Commission, with the advice of the Village Engineer, shall be installed to provide for the adequate disposal of subsurface and surface water and maintenance of natural drainage courses. All storm drainage facilities within the subdivision shall connect to an adequate drainage course.
(B) All storm drainage facilities shall be constructed in accordance with the Village of Smithville Construction and Material Specifications and Standard Construction Drawings.
(1) Storm sewers and storm water drainage. Storm sewers shall be provided on all improved streets. A drainage system adequate to serve the need of the proposed new streets and the entire subdivision will be required in new subdivision. Where an adequate public storm sewer main is available near the subdivision boundary, the subdivider shall construct a storm sewer system and connect with such storm sewer main. If such storm sewer systems are not accessible, the subdivider shall construct a storm sewer system and provide a headwall for discharge to natural drainage channels with easements of adequate width. All downspouts shall be connected to the storm sewer system.
(2) Culverts and bridges. 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. Where culverts are required, the following minimum requirements shall be observed. 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 approved by the responsible governmental official, depending upon jurisdiction. The minimum diameter of a culvert pipe shall be 18 inches. Headwalls, will be required.
(3) Size. The minimum diameter for any main line storm sewer shall be 12 inches.
(4) Backfill. All excavation under or within two feet of street and driveways shall be backfilled with 304 aggregate material compacted in 12 inch lifts.
(Ord. passed 5-10-2001)