(A) If, prior to the submission of the preliminary plat and after consulting with the County Engineer of record or other qualified person, the Subdivision Administrator determines that the subdivider needs to provide a drainage system design which covers the entire subdivision it shall be required to be completed by the subdivider prior to submission of the preliminary plat. The design shall accommodate runoff from the entire subdivision and the historical runoff from areas adjacent to and “upstream” of the subdivision. The design shall insure that runoff from the developed subdivision shall not exceed the historical volumes and velocities discharged onto adjacent property.
(B) The drainage system plans submitted with the preliminary plat shall include:
(1) All proposed surface drainage structures; and
(2) All appropriate design details, dimensions, construction materials and elevations.
(C) At the time of the final plat, the subdivider shall include final drainage design for the phase of the subdivision included in the final plat. The final drainage design shall show how the drainage is consistent with the overall drainage system design.
(Ord. passed 4- -2016)