(a) The developer shall design and construct a storm water drainage system to provide for the adequate movement and disposal of subsurface and surface water. The developer shall provide for the maintenance of all natural drainage courses and shall take adequate measures to protect future property owners from undue and inordinate flooding. The cost to construct the stormwater drainage system shall be borne by the developer of the subdivision.
(b) All design aspects and criteria for hydrology and hydraulics shall be governed by the latest edition of "Standard Drainage Criteria Manual" for Trumbull County, Ohio, except as may be modified herein. All construction and materials specifications for manholes, inlets, catch basins, pipes, ditch linings, headwalls, culverts, and bridges shall be governed by the appropriate sections of the latest edition of the State of Ohio, Department of Transportation, "Construction and Materials Specifications", except that no new open drainage ditches or retaining basins shall be permitted, unless the developer proves to the Planning Commission that such open drainage ditches or retaining basins are necessary for proper storm water runoff control or that strict adherence to the construction of storm sewers will not provide proper storm water runoff control.
(c) The culvert or other drainage facility shall in each case be large enough to accommodate potential runoff from its entire upstream drainage area, whether inside or outside the subdivision. The City Engineer shall also study the effect of each subdivision on existing downstream drainage facilities outside the area of the subdivision. Where it is anticipated that the additional runoff incident to the development of the subdivision will overload an existing downstream drainage facility, the Commission may withhold approval of the subdivision until provision has been made for the improvement of such potential condition. When a proposed drainage system will carry across private land outside the subdivision, appropriate drainage rights must be secured and indicated on the plat.