Agenda - Council - 10/27/2015 - Laserfiche WebLink

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Ordinance Language 5.2. 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. 5.2 Standards for Flood Fringe Permitted Uses: 5.21 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. (a) All service utilities, including ductwork, must be elevated or water -tight to prevent infiltration of floodwaters. (b) As an alternative to elevation on fill, an accessory structure that constitutes a minimal investment and that does not exceed 576 square feet in size may be internally floodproofed in accordance with Section 4.43. 5.22 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 5.21 of this ordinance, or if allowed as a conditional use under Section 5.33 below. 5.23 The storage of any materials or equipment must be elevated on fill to the regulatory flood protection elevation. 5.24 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. 5.25 Fill must be properly compacted and the slopes must be properly protected by the use of riprap, vegetative cover or other acceptable method. 5.26 All new principal structures must have vehicular access at or above an elevation not more than two feet below the regulatory flood protection elevation, or must have a flood warning /emergency evacuation plan acceptable to the (Governina Body). 5.27 Accessory uses such as yards, railroad tracks, and parking lots may be at an elevation lower than the regulatory flood protection elevation. However, any facilities used by employees or the general public must be designed with a flood warning system that provides adequate time for evacuation if the area is inundated to a depth and velocity such that the depth (in feet) multiplied by the velocity (in feet per second) would exceed a product of four upon occurrence of the regional (1% chance) flood. 5.28 Interference with normal manufacturing/industrial plant operations must be minimized, especially along streams having protracted flood durations. In considering permit applications, due consideration must be given to the needs of industries with operations that require a floodplain location. 5.29 Flood fringe developments must not adversely affect the hydraulic capacity of the channel and adjoining floodplain of any tributary watercourse or drainage system. 5.30 Manufactured homes and recreational vehicles must meet the July 2015 10 Commentary can be deleted. "Lowest floor" is defined as the lowest floor of the lowest enclosed area, including basements, crawl spaces, etc. See Section 2.926. (a) clarifies that ductwork must be elevated because it is seldom water -tight which results in health hazards due to mold and mildew after flooding. (b) If an accessory structure exceeds 576 square feet, then FEMA will not allow internal floodproofing, and the structure must be elevated on fill or dry floodproofed in accordance with Section 4.44 (a) — (c). 5.22 is an optional provision. Treating large volumes of fill as a conditional use allows communities to require an erosion control and emergency removal plan for uses such as sand and gravel mining or dredge spoil storage. Section 5.26 is optional, but is mandatory for subdivisions, which include manufactured home parks and recreational vehicle parks/campgrounds. See also Section 7.13. The Federal Emergency Management Agency (FEMA) has established criteria for removing the flood fringe designation for certain structures properly elevated on fill above the regional flood elevation. These standards, included in Technical Bulletin 10.01, require enhanced management and notification procedures. Contact DNR floodplain staff for