(A) Adequate surface and subsurface drainage ways for the removal of storm water shall be provided by the subdivider. The extent to which storm drainage facilities shall be 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 rational method of computing storm water runoff for areas up to 640 acres. For areas over 640 acres, appropriate SCS methods as approved by the City Engineer shall be used. Times of concentration, soil infiltration rates and other variable factors to be used in the analysis shall be discussed with and approved by the City Engineer during the preliminary consideration of the subdivision.
(B) A storm water sewer system, which shall be separate and independent of the sanitary sewer system, with surface inlets, shall be provided by the subdivider in all cases where curb and gutter is to be installed and whenever the available evidence indicates that such a system is necessary due to the inadequacy of the natural surface drainage.
(C) All drainage of non-sanitary water, including sump pumping, roof drains, drain tiles and so on shall be approved by the City Engineer.
(1) The developer, subdivider or builder shall provide as a part of the plans and specifications for any structure or development, a proposal and recommendation for the proper discharge of basement and/or foundation drainage. The recommendations shall meet the requirements of the City Engineer and the Zoning Enforcement Officer. Final approval shall be made by the Planning Commission.
(2) Under no circumstances will 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 the plat:
(1) Drainage easements shall have a width adequate to include the bottom width of the stream plus side slopes not steeper than three feet horizontal to one foot vertical.
(2) Pipe used for drainage purposes shall be in accordance with the standard specifications of the State of Ohio Department of Transportation, Division of Highways, as approved by the City Engineer and Zoning Enforcement Officer.
(E) The plans for the complete installation of the storm drainage system showing all locations, materials, size and profiles shall be prepared by a registered engineer at the expense of the subdivider or developer and shall be approved by and meet the requirements of the State of Ohio or other government agency having jurisdiction, and shall be approved by the City Engineer, Zoning Enforcement Officer and the Planning Commission.
(F) All storm drainage grates shall be constructed to allow bicycles to pass over the grate safely.
(G) Storm drainage flow lines as indicated on the preliminary and final plats shall be clearly identified and protected by restrictive covenants, homeowners associations, deed restrictions or other appropriate mechanisms to ensure that individual properties maintain required drainage ways.
(H) The subdivider shall furnish the Planning Commission a complete set of plans and profiles as approved by the various authorities.
(Ord. 09-3306, passed 10-15-09)