When a development is traversed by a waterway or intermittent stream, there shall be provided a storm water easement or drainage right of way conforming substantially with the lines of same, and such easement shall include an additional area at least fifteen feet (15') in width adjoining one edge of the waterway or intermittent stream that measures twenty feet (20') or less from bank to bank. Where the distance from bank to bank is more than twenty feet (20'), such easement shall include an additional area at least fifteen feet (15') in width adjoining both edges of the waterway or intermittent stream. Where ditch drainage is used in lieu of storm sewers, the easement shall be of sufficient width to allow future construction of a storm sewer main adequate to carry the ultimate runoff of the watershed. Such easement shall be not less than twenty feet (20') in width. The fifteen foot (15') working area adjoining a stream shall be continuous through the development and adjoin existing easements. Public walk ways may be permitted within the easement areas. (Ord. 96-445, 7-2-1996)