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<br />(2 The collapse or subsidence of land along the shore of a lake or other body <br />of water as a result or erosion or undermining caused by waves or currents <br />of water exceeding anticipated cyclical levels or suddenly caused by an <br />unusually high water level in a natural body of water, accompanied by a <br />severe storm, or by an unanticipated force of nature, such as a flash or by <br />some similarly unusual and unforeseeable event which results in flooding <br />as defined in subsection (1) of this section. <br /> <br />Floodplain means: <br /> <br />(1) A relatively flat or low land area adjoining a river, stream or watercourse <br />which is subject to partial or complete inundation; <br /> <br />(2) An area subject to the unusual and rapid accumulation or runoff of surface <br />water from any source. <br /> <br />Floodprone area means any land area susceptible to being inundated by water from any <br />source. <br /> <br />Floodway means the channel of a river or other watercourse and the adjacent land areas <br />that must be reserved in order to discharge the base flood without cumulatively <br />increasing the water surface elevation more than a designated height. <br /> <br />Freeboard means a factor of safety usually expressed in feet above a flood level for <br />purposes of floodplain management. "Freeboard" tends to compensate for the many <br />unknown factors that could contribute to flood heights greater than the height calculated <br />for a selected size flood and floodway conditions, such as wave action, bridge openings, <br />and the hydrological effect of urbanization in the watershed. <br /> <br />Historic structure means any structure that is: <br /> <br />(1) Listed individually in the National Register of Historic Places or <br />preliminarily determined by the Secretary of the Interior as meeting the <br />requirements for individual listing on the National Register; <br /> <br />(2) Certified or preliminarily determined by the Secretary of the Interior as <br />contributing to the historical significance of a registered historic district or <br />a district preliminarily determined by the Secretary to qualify as a <br />registered historic district; <br /> <br />(3) Individually listed by the commonwealth III an inventory of historic <br />places. <br /> <br />Lowest floor means the lowest floor of the lowest enclosed area (including basement). <br />An unfinished or flood-resistant enclosure, usable solely for parking of vehicles, building <br />