A. Where no alleys are provided, easements of not less than ten feet (10') in width shall be dedicated for poles, wires, conduits, storms and sanitary sewer, gas, water or other utility pipes or lines along the rear of each lot and along the side lot lines where necessary. The easements shall be laid out with continuity from lot to lot and from block to block. No building shall be constructed upon the easements.
B. Where a subdivision is traversed by a watercourse, drainageway, channel or stream, there shall be provided a drainage easement conforming substantially with the lines of such watercourses. It shall include an additional area at least fifteen feet (15') wide adjoining both edges of the established floodplain area as certified by the subdivider or his engineer. (1976 Code §16-73)