(A) Minor. The minor drainage system components shall consist of storm sewers, street gutters, small open channels, and swales designed to store and convey the peak rate of runoff and shall conform to Chapter 152 of this code.
(B) Major. The major drainage components shall be designed to store and convey stormwater flows beyond the capacity of the minor drainage components.
(C) Excess stormwater passageways. An excess stormwater passageway shall be provided for the floodplains of all natural watercourses and any manmade watercourses and storm drainage systems as the Superintendent of City Services may direct, which shall have adequate capacity to convey the excess stormwater runoff from the tributary watershed, in conformance with the city subdivision regulations. No structures shall be constructed within this passageway; however, streets, parking lots, playgrounds, park areas, pedestrian walkways, open green space, and utility and sewer easements shall be considered compatible uses.