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5. The collapse or subsidence of land along the shore of a lake or other body of water as a result <br />of erosion or undermining caused by waves or currents of water exceeding anticipated cyclical <br />levels or suddenly caused by an unusually high water level in a natural body of water, <br />accompanied by a severe storm, or by an unanticipated force of nature, such as flash flood or <br />an abnormal tidal surge, or by some similarly unusual and unforeseeable event which results <br />in flooding as defined in paragraph (1)(a) of this definition. <br />Flood elevation study <br />An examination, evaluation and determination of flood hazards and, if appropriate, <br />corresponding water surface elevations, or an examination, evaluation and determination of <br />mudslide (i.e., mudflow) and/or flood -related erosion hazards. Also known as a Flood <br />Insurance Study (FIS). <br />Flood insurance rate map (FIRM) <br />The official map on which the Federal Insurance Administration has delineated both the areas <br />of special flood hazards and the risk premium zones applicable to the community. A FIRM <br />that has been made available digitally is called a Digital Flood Insurance Rate Map (DFIRM). <br />Flood insurance study <br />See "Flood Elevation Study." <br />Floodplain or flood -prone area <br />Any land area susceptible to being inundated by water from any source. See "Flood or <br />flooding." <br />Floodplain administrator <br />The community official designated by title to administer and enforce the floodplain <br />management regulations. <br />Floodplain management regulations <br />Zoning ordinances, subdivision regulations, building codes, health regulations, special <br />purpose ordinances (such as floodplain ordinance, grading ordinance and erosion control <br />ordinance) and other application of police power. The term describes such state or local <br />regulations, in any combination thereof, which provide standards for the purpose of flood <br />damage prevention and reduction. <br />Flood proofing <br />Any combination of structural and nonstructural additions, changes, or adjustments to <br />structures which reduce or eliminate risk of flood damage to real estate or improved real <br />property, water and sanitary facilities, structures, and their contents. Flood proofed <br />structures are those that have the structural integrity and design to be impervious to <br />floodwater below the Base Flood Elevation. <br />Floodway <br />The channel of a river or other watercourse and the adjacent land areas (a portion of the <br />100 -year floodplain) that must be reserved in order to discharge the base flood without <br />cumulatively increasing the water surface elevation more than a designated height. Also <br />referred to as "Regulatory Floodway." <br />Functionally dependent use <br />A use which cannot perform its intended purpose unless it is located or carried out in close <br />proximity to water. The term includes only docking facilities, port facilities that are necessary <br />for the loading and unloading of cargo or passengers, and ship building and ship repair <br />facilities, and does not include long-term storage or related manufacturing facilities. <br />Highest adjacent grade <br />