01-09-2017 Council Packet - Laserfiche WebLink

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elevations within floodway listed in the floodway data table contained in the flood insurance study. Regulatory flood protection elevations between cross sections shall be interpolated. (2) The regulatory flood protection elevation for Lake Minnetonka shall be 932.5 MSL. (3) The regulatory flood protection elevation within the general floodplain district shall be calculated by a qualified registered professional engineer in accordance with procedures set forth in this article. Sec. 78-1124. - Permitted uses. Permitted uses are those uses of land or structures allowed in the underlying zoning district(s) that comply with the standards in section 78-1125. If no pre-existing, underlying zoning districts exist, then any residential or nonresidential structure or use of a structure or land is a permitted use provided it does not constitute a public nuisance. Sec. 78-1125. - Standards for flood fringe permitted uses. (a) All structures, including accessory structures, must be elevated on fill so that the lowest floor, as defined, is at or above the regulatory flood protection elevation. The finished fill elevation for structures must be no lower than one foot below the regulatory flood protection elevation and the fill must extend at the same elevation at least 15 feet beyond the outside limits of the structure. (b) Accessory structures. As an alternative to the fill requirements of section 78-1125(a), structures accessory to the uses identified in section 78-1124 may be permitted to be internally/wet floodproofed to the FP3 or FP4 floodproofing classifications in the state building code, provided that: (1) the accessory structure constitutes a minimal investment, does not exceed 576 square feet in size, and is only used for parking and storage. (2) All portions of floodproofed accessory structures below the regulatory flood protection elevation must be: (i) adequately anchored to prevent flotation, collapse or lateral movement and designed to equalize hydrostatic flood forces on exterior walls, (ii) be constructed with materials resistant to flood damage, and (iii) must have all service utilities be water -tight or elevated to above the regulatory flood protection elevation (3) Designs for meeting this requirement must either be certified by a registered professional engineer or meet or exceed the following criteria: a. To allow for the equalization of hydrostatic pressure, there must be a minimum of two "automatic" openings in the outside walls of the structure, with a total net area of not less than one square inch for every square foot of enclosed area subject to flooding; and b. There must be openings on at least two sides of the structure and the bottom of all openings must be no higher than one foot above the lowest adjacent grade to the structure. Using human intervention to open a garage door prior to flooding will not satisfy this requirement for automatic openings. (c) The cumulative placement of fill or similar material on a parcel must not exceed 1,000 cubic yards, unless the fill is specifically intended to elevate a structure in accordance with section 78-1125(a) of this article, or if allowed as a conditional use under section 78-1126(3) below. (d) The storage of any materials or equipment must be elevated on fill to the regulatory flood protection elevation. (e) All service utilities, including ductwork, must be elevated or water -tight to prevent infiltration of floodwaters. (f) The storage or processing of materials that are, in time of flooding, flammable, explosive, or potentially injurious to human, animal, or plant life is prohibited. Page 2