If any portion of any land, within the boundaries shown on any such final map, is subject to overflow, inundation or flood hazard by stormwaters, such fact and the portion shall be clearly shown on such final map enclosed in a border on each sheet of the map, and further adequate storm drain system and/or levees, dikes and pumping systems shall be provided, and if fill is used in tideland areas, it shall be a minimum of two feet above high tide. (Ord. 89 § 5.16, 1955).