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of floodway boundaries so that floodplain lands on both sides of a stream are capable of conveying a proportionate share of flood flows. FLOOD. A temporary increase in the flow or stage of a stream or in the stage of a wetland or lake that results in the inundation of normally dry areas. PLOOD FREQUENCY. the frequency for which it is expected that a specific flood stage or discharge may be equaled or exceeded. FLOOD FRINGE. That portion of the floodplain outside of the floodway. The term is synonymous with the term FLOODWAY FRINGE used in the flood insurance study for the city. FLOODPLAIN. The beds proper and the areas adjoining a wetland, lake or watercourse which have been or hereafter may be covered by the regional flood. FLOOD-PROOFING. A combination of structural provisions, changes or adjustments to properties and structures subject to flooding, primarily for the reduction or elimination of flood damages. FLOODWAY. The bed of a wetland or lake and the channel of a watercourse and those portions of the adjoining floodplain which are reasonably required to carry or store the regional flood discharge. 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 the water. 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 human-made obstruction. In an urban area, the segment of a stream or river between 2 consecutive bridge crossings would most typically constitute a REACH. REGIONAL FLOOD. A flood which is representative of large floods known to have occurred generally in the state and reasonably characteristic of what can be expected to occur on an average frequency in the magnitude of the 100-year recurrence interval. The term is synonymous with the term BASE FLOOD used in the flood insurance study. REGULATORY FLOOD PROTECTION ELEVATION. An elevation no lower than 1 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. STRUCTURE. An~g constructed or erec~d on the ground or attach,ed to the ground or on-site utilities, including but not limited to buildings, factories, sheds, detached garages, cabins, manufactured homes, travel trailers or vehicles not meeting the exemption criteria specified in ~ 155.32(C) and other similar items. VARIANCE. A modification of a specific permitted development standard required in an official control, including this chapter, to allow an alternative development standard 3