(a) Adequate surface and subsurface drainageways for the removal of storm water shall be provided by the subdivider. The extent to which storm drainage facilities are required shall be based upon an analysis of need, prepared for the subdivider by a registered professional engineer. The analysis shall be based upon the reactional method of computing storm water run-off, using the maximum one-hour rainfall to be expected at a ten-year frequency. Times of concentration, soil infiltration rates and other variable factors to be used in the analysis shall be discussed with and approved by the Municipal Engineer during the preliminary consideration of the subdivision.
(b) A storm water sewerage system, which shall be separate and independent of the sanitary sewerage system, with surface inlets, shall be provided by the subdivider in all cases where curbs and gutters are to be installed and whenever available evidence indicates that such a system is necessary due to the inadequacy of the natural surface drainage.
(c) All nonsanitary water, including sump pumping, roof drain tiles and the like, shall be connected to the public storm drainage system. Under no circumstances shall the subdivider, developer, builder or occupant be permitted to discharge such drainage onto any street, alley, sidewalk or other public right-of-way.
(d) To ensure proper drainage right-of-way width, the following requirements shall be incorporated in a plat:
(1) Drainage easements shall have a width adequate to include the bottom width of a stream, plus side slopes not steeper than three feet horizontal to one foot vertical.
(2) Pipes used for drainage purposes shall be in accordance with the standard specifications of the State Department of Transportation, Division of Highways, as approved by the Municipal Engineer and the Zoning Inspector.
(e) Plans for the complete installation of the storm drainage system, showing all locations, materials, sizes and profiles, shall be prepared by a registered engineer at the expense of the subdivider or developer, shall be approved by and meet the requirements of the State or other government agency having jurisdiction and shall be approved by the Municipal Engineer, the Zoning Inspector and the Planning Commission.
(f) The subdivider shall furnish the Commission with a complete set of plans and profiles as approved by the various authorities.
(Ord. 9-76. Passed 9-9-76.)