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a. The structure must be adequately anchored to prevent flotation, collapse or lateral movement <br />and designed to equalize hydrostatic flood forces on exterior walls; and <br /> b. Any mechanical and utility equipment in the structure must be elevated to or above the <br />regulatory flood protection elevation or properly floodproofed. <br /> 4. As an alternative, an accessory structure may be internally/wet floodproofed to the FP-3 or FP-4 <br />flood-proofing classification in the State Building Code, provided the accessory structure constitutes a <br />minimal investment, does not exceed 576 square feet in the size. A detached garage may only be used for <br />parking of vehicles and limited storage. All flood-proofed accessory structures must meet the following <br />standards: <br /> a. To allow for the equalization of hydrostatic pressure, there must be a minimum of two automatic <br />openings in the outside walls of the structure, with a total net area of not less than one square inch for every <br />square foot of enclosed area subject to flooding; and <br /> b. There must be openings on at least two sides of the structure and the bottom of all openings <br />must be no higher than one foot above the lowest adjacent grade to the structure. Using human intervention <br />to open a garage door prior to flooding will not satisfy this requirement for automatic openings. <br /> (d) Structural works for flood control that will change the course, current or cross section of protected <br />wetlands or public waters are subject to the provisions of M.S. § 103G.245. <br /> (e) A levee, dike or floodwall constructed in the floodway must not cause an increase to the 1% chance <br />or regional flood. The technical analysis must assume equal conveyance or storage loss on both sides of a <br />stream. <br /> (f) Floodway developments must not adversely affect the hydraulic capacity of the channel and <br />adjoining floodplain of any tributary watercourse or drainage system. <br />(Ord. 10-15, passed 11-23-2015) <br />§ 1103.06 FLOOD FRINGE DISTRICT (FF). <br /> (1) Permitted uses. Permitted uses are those uses of land or structures allowed in the underlying zoning <br />district(s) that comply with the standards in division (2). <br /> (2) Standards for flood fringe permitted uses. <br /> (a) All structures, including accessory structures, must be elevated on fill so that the lowest floor, as <br />defined, is at or above the regulatory flood protection elevation. The finished fill elevation for structures <br />must be no lower than one foot below the regulatory flood protection elevation and the fill must extend at <br />the same elevation at least 15 feet beyond the outside limits of the structure. <br /> 1. All service utilities, including ductwork, must be elevated or water-tight to prevent infiltration of <br />floodwaters. <br /> 2. As an alternative to elevation on fill, an accessory structure that constitutes a minimal investment <br />and that does not exceed 576 square feet in size may be internally floodproofed in accordance with § <br />1103.05(4)(c). <br /> (b) The cumulative placement of fill or similar material on a parcel must not exceed 1,000 cubic yards, <br />unless the fill is specifically intended to elevate a structure in accordance with division (2) of this section, <br />or if allowed as a conditional use under division (3)(c) below. <br /> (c) The storage of any materials or equipment must be elevated on fill to the regulatory flood <br />protection elevation.