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"Building" a structure designed for the housing, enclosure or shelter of persons, animals or property of any kind. "Development" means any man-made change to improved or unimproved real estate, including but not limited to buildings or other structures, mining, dredging, filling, grading, paving, excavation or drilling operations. "Existing construction" means (for the purposes of determining rates) structures for which the "start of construction" commenced before June 1, 1978. "Existing construction" may also be referred to as "existing structures." "Flood" or flooding" means a general and temporary condition of partial or complete inundation of normally dry land areas from: (1) The overflow of inland or tidal waters; (2) The unusual and rapid accumulation of runoff or surface waters from any source. "Flood Hazard Boundary Map" (FHBM) and Flood Insurance Rate Map (FIRM)" means an official map of a community on which the Flood Insurance Study has delineated the flood hazard boundaries and the zones establishing insurance rates applicable to the community. "Flood Insurance Study" is the official report provided by the Federal Insurance Administration. The report contains flood profiles, as well as the Flood Boundary- Floodway Map and the water surface elevation of the base flood. "Floodway" means the channel of a river or other water- course and the adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than one foot. "Floodway Fringe" is that area of the flood plain, outside of the floodway, that in the average is likely to be flooded once every one hundred years (i.e., that has a one percent chance of flood occurrence in any one year). "Freeboard" means a factor of safety usually expressed in feet above a flood level for purposes of flood plain management. Freeboard tends to compensate for the many unknown facts that could contribute to flood heights -2-