The provisions of this chapter shall apply to all lands within the jurisdiction of the City shown on the official zoning map as being within the boundaries of the Floodway, Floodway Fringe, and General Flood Plain Districts shown on the Official Flood Plain Zoning Map, and said map, together with all explanatory matter thereon and attached thereto, is hereby adopted by reference and declared to be part of this chapter. The Official Zoning Map is on file in the office of the Clerk. The Linn County Flood Insurance Study for the City is attached to and made a part of the Official Flood Plain Zoning Map.