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17-4 requirements for individual listing on the National district is a conforming use. However, if the first Register; floor is lower than the flood protection elevation, (b) Certified or preliminarily determined by the the structure is nonconforming.) Secretary of the Interior as contributing to the (40) NONCONFORMING USE: An existing historical significance of a registered historic lawful use or accessory use of a structure or district or a district preliminarily determined by the building which is not in conformity with the Secretary to qualify as a registered historic district; provisions of this ordinance for the area of the (c) Individually listed on a state inventory of floodplain which it occupies. (Such as a residence historic places in states with historic preservation in the floodway.) programs which have been approved by the (41) OBSTRUCTION TO FLOW:Any develop- Secretary of the Interior; or ment which physically blocks the conveyance of (d) Individually listed on a local inventory of floodwaters such that this development by itself or historic places in communities with historic in conjunction with any future similar development preservation programs that have been certified will cause an increase in regional flood height. either by an approved state program, as (42) OFFICIAL FLOODPLAIN ZONING MAP: determined by the Secretary of the Interior; or That map, adopted and made part of this directly by the Secretary of the Interior in states ordinance, as described in s. 17.11, which has without approved programs. been approved by the Department of Natural (34) INCREASE IN REGIONAL FLOOD HEIGHT: Resources and FEMA. A calculated upward rise in the regional flood (43) OPEN SPACE USE: Those uses having a elevation, equal to or greater than 0.01 foot, relatively low flood damage potential and not resulting by a comparison of existing conditions involving structures. and proposed conditions which is directly (44) ORDINARY HIGHWATER MARK: The attributable to development in the floodplain but point on the bank or shore up to which the not attributable to manipulation of mathematical presence and action of surface water is so variables such as roughness factors, expansion and continuous as to leave a distinctive mark such as contraction coefficients and discharge. by erosion; destruction or prevention of terrestrial (35) LAND USE: Any nonstructural use made of vegetation, predominance of aquatic vegetation, or unimproved or improved real estate. (Also see other easily recognized characteristic. DEVELOPMENT.) (45) PERSON: An individual, or group of (36) MOBILE HOME: A structure transportable individuals, corporation, partnership, association, in one or more sections, which is built on a municipality or state agency. permanent chassis and is designed to be used with (46) PRIVATE SEWAGE SYSTEM: A sewage or without a permanent foundation when treatment and disposal system serving a single connected to required utilities. For the purpose of structure with a septic tank and soil absorption this ordinance, it does not include recreational field located on the same parcel as the structure. vehicles or travel trailers which remain licensed This term also means an alternative sewage system and ready for highway use and remain on-site less approved by the department of industry, labor and than 180 days. As used in this ordinance, mobile human relations including a substitute for the home includes manufactured homes.' septic tank or soil absorption field, a holding tank, (37) MUNICIPALITY or MUNICIPAL: A city, a system serving more than one structure or a village or town located wholly or partly within the system located on a different parcel than the boundaries of the County of Dane. structure. (38) NGVD or the National.Geodetic Vertical (47) PUBLIC UTILITIES: Those utilities using Datum refers to elevations referenced to mean sea underground or overhead transmission lines such level datum, 1929 adjustment. as electric, telephone and telegraph, and (39) NONCONFORMING STRUCTURE: An distribution and collection systems such as water, existing lawful structure or building which is not in sanitary sewer and storm sewer. conformity with the dimensional or structural (48) REGIONAL FLOOD: A flood determined to requirements of this ordinance for the area of the be representative of large floods known to have floodplain which it occupies. (For example, an occurred in Wisconsin or which may be expected existing residential structure in the floodfringe 6 Annotation: As set forth federal rule, Oct. 1990 Unofficial Text Dane County Code of Ordinances rev. 043095