(A) A drainage plan shall be filed with the preliminary plat for residential subdivisions and planned unit developments and shall be filed and approved prior to the issuance of a building permit for commercial, business, office and research developments.
(B) The drainage plan shall include engineering drawings and supporting calculations, which describe existing storm water drainage systems and environmental features, as well as the drainage system and the environmental improvements which are proposed before development of the property.
(C) The drainage plan shall contain the following:
(1) Topographic survey of the property at two-foot contours or spot elevations that adequately define drainage;
(2) Banks and centerline of streams and channels;
(3) Shoreline of lakes, ponds and detention basins;
(4) Farm drain and tiles;
(5) Sub-watershed boundaries within the property;
(6) Property's location within larger watershed;
(7) Location, size and slope of storm water conduits and drainage of water;
(8) Sanitary sewers;
(9) Delineation of upstream and downstream drainage features and watersheds which might be affected by the development;
(10) Retention/detention facilities;
(11) Roads, streets, inlets and storm sewers;
(12) Site plan with lots, public improvements, drainage easements and building outlines;
(13) Base flood elevation and regulatory floodway where identified for the property;
(14) Drainage certificate signed by a professional engineer and owner; and
(15) Preparation of storm water management plan. All computations, plans and specifications related to the implementation of this plan shall be prepared and sealed by a professional engineer registered with the state.
(2001 Code, § 34-6-37)