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Sec. 90-138. Floodplain district.. The floodplain district of the City of Hugo shall apply to all lands in the city shown on the official zoning map and/or the attachments thereto as being located within the boundaries of Zone AE or Zone A. Establishment of official zoning map: 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 prepared by the Federal Emergency Management Agency and dated February 3, 2010 and Flood Insurance Rate Map Panels numbered; 2705040109E, 2705040117E, 2705040119E, 2705040128E, 2705040129E, 2705040133E, 2705040134E, 2705040136E, 2705040138E, 2705040140E, 2705040143E, 2705040144E, 2705040145E, 2705040207E, 2705040230E, and 2705040235E. The official zoning map shall be on file in the office of the city clerk. (1)Permitted uses. Any use of the land that does not involve a structure, a habitation, an addition to the outside dimensions of an existing structure, or an obstruction to flood flows such as fill, excavation, or the storage of materials and supplies, so long as such use is permitted in the underlying zoning district. The use must not increase any stage of the 100-year regional flood or cause an increase in flood damages in the reach or reaches affected. (2)Accessory uses. Any use of the land that does not involve a structure, a habitation, an addition to the outside dimensions of an existing structure, or an obstruction to flood flows such as fill, excavation, or the storage of materials and supplies, so long as such use is a permitted accessory use in the underlying zoning district. The use must not increase any stage of the 100-year regional flood or cause an increase in flood damages in the reach or reaches affected. (3)Conditional uses. Any permitted, accessory, or conditional use allowed in the underlying zoning district may be allowed as a conditional use in the general floodplain district subject to the conditions established in subsection (4) of this section. (4)Standards for floodplain district conditional uses. a. No structure, facility, or land use shall be allowed in the floodway that will increase the stage of the 100-year regional flood or cause an increase in flood damages in the reach or reaches affected, except for railroads, essential government facilities, accessory structures for public and private recreational facilities, essential utilities, marinas, docks, and other water -oriented accessory structures.