(a) Undeveloped parcels of land that are one acre or more in area and that are outside of recorded subdivisions, and all undeveloped parcels of land where existing downstream storm drainage facilities are not adequate, shall be subject to the following regulations at the time of development:
(1) All necessary facilities, including pipes, inlets, catch basins or open drainage ditches, shall be installed to provide for the adequate disposal of surface water and to maintain a natural drainage course. Existing agricultural drainage ditches located within a parcel of land to be developed shall be realigned, widened, deepened, paved or replaced with an underground pipe, as required for the handling of storm run-off from roofs and impervious surfaces.
(2) An overall drainage layout plan showing the limits of the contributing run-off area, broken down into areas contributing to each drainage pick-up point, shall be submitted to and approved by the Director of Public Service. In tills plan, drainage design within the parcel of land to be developed shall be adequate to handle the entire contributing watershed area and its existing, proposed and probable future development and not only the area under submission.
(b) If existing downstream storm sewer facilities are not adequate, then downstream improvements, detention ponds, retention ponds or other detention and/or retention methods shall. be required at the expense of the developer. Complete drainage calculations must be submitted showing pipe size determination, ten-year hydraulic gradient checks and catch basin type and spacing.
The overall drainage layout plan shall show the proposed grading of the parcel of land to be developed, the proposed ground elevation at each proposed building on the parcel, the finished floor elevation of each proposed building on the parcel and all existing and proposed drainage facilities.
(1) Downspouts and foundation drains shall not be extended through the curb to outlet in the gutter on any new construction. Water from downspouts shall be directed over the ground using splash blocks or other erosion control devices unless otherwise determined by the Director of Public Service or his or her designee.
(2) Storm drainage facilities shall, in general, be installed in accordance with all applicable requirements of the City. Storm sewer standards, construction and specifications shall conform to "Storm Drainage Design Criteria," as published in the Lucas County Construction Standards.
(3) Headwalls, as approved by the Director of Public Service, shall be constructed at both ends of all culverts. Where possible, culverts shall be in accordance with a standard Ohio Department of Transportation design. Erosion control may be required at culverts or other locations along open ditches. (Ord. 238-2013. Passed 12-16-13.)