Ord #177 - Flood Plain Management Ordinance

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Manufactured Home — a structure, transportable in one or more sections, which is built on a permanent chassis and is designed for use with or without a permanent foundation when attached to the required utilities. The term "manufactured home" does not include the term "recreational vehicle." New Construction - Structures, including additions and improvements, and placement of manufactured homes, for which the start of construction commenced on or after the effective date of this ordinance. Obstruction — any dam, wall, wharf, embankment, levee, dike, pile, abutment, projection, excavation, channel modification, culvert, building, wire, fence, stockpile, refuse, fill, structure, or matter in, along, across, or projecting into any channel, watercourse, or regulatory floodplain which may impede, retard, or change the direction of the flow of water, either in itself or by catching or collecting debris carried by such water. One Hundred Year Floodplain — lands inundated by the "Regional Flood" (see definition). Principal Use or Structure —all uses or structures that are not accessory uses or structures. Reach — a hydraulic engineering term to describe a longitudinal segment of a stream or river influenced by a natural or man-made obstruction. In an urban area, the segment of a stream or river between two consecutive bridge crossings would most typically constitute a reach. Recreational Vehicle — a vehicle that is built on a single chassis, is 400 square feet or less when measured at the largest horizontal projection, is designed to be self-propelled or permanently towable by a light duty truck, and is designed primarily not for use as a permanent dwelling but as temporary living quarters for recreational, camping, travel, or seasonal use. For the purposes of this ordinance, the term recreational vehicle is synonymous with the term "travel trailer/travel vehicle." Regional Flood — a flood which is representative of large floods known to have occurred generally in Minnesota and reasonably characteristic of what can be expected to occur on an average frequency in the magnitude of the 1% chance or 100 -year recurrence interval. Regional flood is synonymous with the term "base flood" used in a flood insurance study. Regulatory Flood Protection Elevation (RFPE) - an elevation not less than one foot above the elevation of the regional flood plus any increases in flood elevation caused by encroachments on the floodplain that result from designation of a floodway. a. The regulatory flood protection elevation within the floodway and flood fringe districts, except for Lake Minnetonka, shall be established by adding 1.0 foot to the base flood water surface 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. b. The regulatory flood protection elevation for Lake Minnetonka shall be 932.5 MSL. C. 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. Repetitive Loss: Flood related damages sustained by a structure on two separate occasions during a ten year period for which the cost of repairs at the time of each such flood event on the average equals or exceeds 25% of the market value of the structure before the damage occurred.