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DANE COUNTY CODE 11 - 15 community. Flood hazard and insurance (y) Mobile home. A structure transportable rate zones are designated as A Zones. Said in one or more sections, which is built on a maps form the basis for the regulatory permanent chassis and designed to be used and/or the insurance aspects of the National with or without a permanent foundation -- Flood Insurance Program. - when connected to the required utilities. For the purpose of this ordinance it does not (r) Flood plain. The flood plain is the land include recreational vehicles or travel which has been or may be hereafter covered trailers.' ' by flood water during the regional flood.The flood plain includes the floodway and the (z) Nonconforming use. A nonconforming ' flood fringe. use is an existing lawful use,of a structure, building or accessory use which is not in (s)Flood profile. A graph or a longitudinal conformity with the provisons of the flood profile showing the relationship of the water plain zoning ordinance for the area of the surface elevation of a flood event to locations flood plain which it occupies. ' - along a stream or river. . . (aa) Official flood plain zoning map. That ' ; - (t) Flood proofing. Flood proofing involves map, adopted and made part of this any combination of structural provisions, ordinance, which has been approved by the changes, or adjustment to properties and Department of Natural Resources and the ! structures subject to flooding, primarily for, Federal Insurance Administration of HUD, - the purpose of reducing or eliminating flood and which delineates those areas which damage to properties, water and sanitary would be inundated by the base or regional facilities, structures and contents of flood, including but not limited to numbered ' __' buildings in flood hazard areas. and unnumbered A Zones, and where applicable, floodways. This map may be a (u) Flood protection elevation. The flood flood Hazard Boundary Map (see protection elevation shall correspond to a 11,151)(q)), or other approved community 1 point two feet of freeboard above the water flood plain map. surface profile associated with the regional flood and the official floodway lines. (See (bb) Official letter (,/' map ainercd'neut. also: "freeboard".) Official notification from the Federal Insurance Administration of HUD that a (v) Flood way. The floodway is the channel Flood Hazard Boundary Map or Flood of a river or stream and those portions of the Insurance Study Map has been amended. flood plain adjoining the channel required to carry and discharge the flood water or flood (cc) Reach, hydraulic. A hydraulic reach flows associated with the regional flood. along a river or stream is that portion of the river or stream extending from one (w) Freeboard. Freeboard is a factor of significant change in the hydraulic safety usually expressed in terms of a certain character of the river or stream to the next amount of feet above a calculated flood level. significant change. These changes are Freeboard compensates for the many - usually associated with breaks in the slope of unknown factors that contribute to flood the water surface profile, and may be caused heights greater than the height calculated. by bridges,dams,expansion and contraction These unknown factors include, but are not of the water flow,and changes in stream bed limited to, ice jams, debris accumulation, slope or vegetation. wave action, obstruction 6f bridge openings _" and floodways, the effects of urbanization on (dd) Regional flood. The regional flood is a the hydrology of the watershed, loss of flood flood determined to-\be representative of storage areas due to development and large floods known to have generally aggradation of the river or stream bed. - occurred in Wisconsin and which may be expected to occur on a particular stream (x) Land use. Any "development" as because of like physical characteristics. The defined in11.15(1)(i). flood frequency of the regional flood is once