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subject to flooding, primarily for the reduction or elimination <br /> of flood damages. • <br /> FLOODWAY: shall mean the bed of a wetland or lake and the <br /> channel of a watercourse and those portions of the adjoining <br /> floodplain which are reasonably required to carry or store the <br /> regional flood discharge. <br /> OBSTRUCTION: shall mean any dam, wall, wharf, embankment, levee, <br /> dike, pile, abutment, projection, excavation, channel <br /> modification, culvert, building, wire, fence, stockpile, refuse, <br /> fill, structure, or matter in, along, across, or projecting into <br /> any channel, watercourse, or regulatory floodplain which may <br /> impede, retard, or change the direction of the flow of water, <br /> either in itself or by catching or collecting debris carried by <br /> such water. <br /> REACH: shall mean a hydraulic engineering term to describe a <br /> longitudinal segment; of a stream or river influenced by a <br /> natural or man-made obstruction. In an urban area, the segment <br /> of a stream or river between two consecutive bridge crossings <br /> would most typically constitute a reach. <br /> REGIONAL FLOOD: shall mean a flood which is representative of <br /> large floods known to have occurred generally in Minnesota and <br /> reasonably characteristic of what can be expected to occur on an • <br /> average frequency in the magnitude of the 100-year recurrence <br /> interval . Regional flood is synonymous with the term "base <br /> flood" used in the Flood Insurance Study. <br /> REGULATORY FLOOD PROTECTION ELEVATION: shall mean an elevation <br /> no lower than one foot above the elevation of the regional flood <br /> plus any increases in flood elevation caused by encroachments on <br /> the floodplain that result from designation of a floodway. <br /> STRUCTURE: shall mean anything constructed or erected on the <br /> ground or attached to the ground or on-site utilities including, <br /> but not limited to, buildings, factories, sheds, detached <br /> garages, cabins, manufactured homes, travel trailers/vehicles not <br /> meeting the exemption criteria specified in Section 902 . 14 (3) (A) <br /> of this Ordinance and other similar items. <br /> 902 . 04 - ESTABLISHMENT OF ZONING DISTRICTS. <br /> 1 . Districts. The floodplain areas within the jurisdiction of • <br /> this Ordinance are hereby divided into two districts: Floodway <br /> 9.157 <br />