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• 17-4 • floodways, the effects of urbanization- on tfie (36) -MOBILE HOME: A structure transportable hydrology of the watershed, loss of flood storage in one or more sections, which is built on a areas due to development and aggregation of the ,permanent chassis and is designed to be used with river or stream bed. or without a permanent foundation when (30) GENERAL FLOODPLAIN DISTRICT: connected to required utilities. For the purpose of Consists of all areas which have been or may be this ordinance, it does not include recreational covered by floodwater during the regional flood. It vehicles or travel trailers which remain licensed includes both the floodway and floodfringe and ready for highway use and remain on-site less districts. than 180 days. As used in this ordinance, mobile (31) [reserved for future use.] home includes manufactured homes.' (32) HIGH FLOOD DAMAGE POTENTIAL: (37) MUNICIPALITY or MUNICIPAL: A city, Damage that could result from flooding that village or town located wholly or partly within the includes any danger to .life or health or any boundaries of the County of Dane. significant economic loss to a structure or building, (38) NGVD or the National Geodetic Vertical and its contents. Datum: Refers to,elevations referenced to mean sea (33) HISTORIC STRUCTURE:5 Any structure that level datum, 1929 adjustment. is: (39) NONCONFORMING STRUCTURE: An (a) Listed individually in the National Register existing lawful structure or building which is not in of Historic Places or preliminarily determined by conformity with the dimensional or structural the Secretary of .the Interior as meeting the requirements of this ordinance for the area of the requirements for individual listing on the National floodplain which it occupies. (For example, an Register; existing residential structure in the floodfringe (b) Certified or preliminarily determined,by the district is a conforming use. However, if the first Secretary of the Interior as contributing to the floor is lower than the flood protection elevation; historical significance. of a registered historic the structure is nonconforming.) district or a district preliminarily determined by the (40) NONCONFORMING USE: An existing secretary to qualify as a registered'historic district; lawful use or accessory use of a structure or (c) Individually listed on a state inventory of building which is not in conformity with the historic places in states with historic preservation provisions of this ordinance" for the area of the programs which have been approved by the floodplain which it occupies. (Such as a residence Secretary of the Interior; or in the floodway.) (d) Individually listed on a local inventory of (41) OBSTRUCTION TO FLOW: Any historic places in communities with historic development which physically blocks the preservation programs that have been certified conveyance of floodwaters such that this either by an approved state program, as development by itself or in conjunction' with any determined by the Secretary of the Interior; or future similar development will cause an increase directly by the,Secretary of the Interior in,states in regional flood height. without approved programs. - (42) OFFICIAL FLOODPLAIN ZONING MAP: (34) INCREASE IN REGIONAL FLOOD HEIGHT: That map, adopted and made part of this A calculated upward rise in the regional flood ordinance, as described in s. 17.11, which has elevation, equal to or greater than 0.01 foot, been approved by the department of natural resulting by a comparison of existing conditions resources and FEMA. and proposed conditions which is directly (43) OPEN SPACE USE: Those uses having a . attributable to development in the floodplain but relatively low flood damage potential and not not attributable to manipulation of mathematical involving structures. variables such as roughness factors, expansion and (44) ORDINARY HIGHWATER MARK: The contraction coefficients and discharge. point on the bank "or shore up to which the (35) LAND USE: Any nonstructural use made of presence and action of surface water is so unimproved or improved real estate. (Also see continuous as to leave a distinctive mark such as DEVELOPMENT.) by erosion, destruction or prevention of terrestrial 5 Annotation: As set forth federal rule, Oct. 1990. 6 Annotation: As set forth federal rule, Oct. 1990. rev. 043095`