The official zoning map together with all materials attached thereto is hereby adopted by reference and declared to be a part of this chapter. The attached material shall include the Flood Insurance Study for Washington County, Minnesota and Incorporated Areas and Flood Insurance Rate Map Panel therein numbered 27163C0367E, both dated February 3, 2010, and prepared by the Federal Emergency Management Agency. The official zoning map shall be on file in the office of the City Clerk-Administrator.