April Dane County Code of Ordinances

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Chapter 17 and contents of buildings subject to flooding, for the or a district preliminarily determined by the secretary purpose of reducing or eliminating flood damage. to qualify as a registered historic district; (26) FLOOD PROTECTION ELEVATION: An (c) Individually listed on a state inventory of elevation two feet of freeboard above the water historic places in states with historic preservation surface profile elevation designated for the regional programs which have been approved by the Secretary flood. of the Interior;or (27) FLOOD STORAGE: Those floodplain areas (d) Individually listed on a local inventory of where storage of floodwaters has been taken into historic places in communities with historic account during analysis in reducing the regional flood preservation programs that have been certified either discharge. by an approved state program, as determined by the (28) FLOODWAY: The channel of a river or stream Secretary of the Interior; or directly by the Secretary and those portions of the floodplain adjoining the of the Interior in states without approved programs. channel required to carry the regional flood (34) INCREASE IN REGIONAL FLOOD HEIGHT: discharge. A calculated upward rise in the regional flood (29) FREEBOARD: A flood protection elevation elevation, equal to or greater than 0.01 foot,resulting requirement designed as a safety factor which is by a comparison of existing conditions and proposed i l; usually expressed in terms of a specified number of conditions which is directly attributable to feet above a calculated flood level. Freeboard development in the floodplain but not attributable to compensates for the effects of any factors that manipulation of mathematical variables such as contribute to flood heights greater than those roughness factors, expansion and contraction calculated. These factors include, but are not limited coefficients and discharge. to, ice jams, debris accumulation, wave action, (35) LAND USE: Any nonstructural use made of obstruction of bridge openings and floodways, the unimproved or improved real estate. (Also see effects of urbanization on the hydrology of the DEVELOPMENT.) watershed, loss of flood storage areas due to (36) MOBILE HOME: A structure transportable in development and aggregation of the river or stream one or more sections, which is built on a permanent bed. chassis and is designed to be used with or without a (30) GENERAL FLOODPLAIN DISTRICT: permanent foundation when connected to required Consists of all areas which have been or may be utilities. For the purpose of this ordinance,it does not - covered by floodwater during the regional flood. It include recreational vehicles or travel trailers which includes both the floodway and floodfringe districts. remain licensed and ready for highway use and (31) [reserved for future use.J remain on-site less than 180 days. As used in this (32) HIGH FLOOD DAMAGE POTENTIAL: ordinance, mobile home includes manufactured Damage that could result from flooding that includes homes.9 any danger to life or health or any significant (37) MUNICIPALITY or MUNICIPAL: A city, economic loss to a structure or building and its village or town located wholly or partly within the contents. boundaries of the County of Dane. (33) HISTORIC STRUCTURE:8 Any structure that (38) NGVD or the National Geodetic Vertical is: Datum: Refers to elevations referenced to mean sea (a) Listed individually in the National level datum, 1929 adjustment. Register of Historic Places or preliminarily (39) NONCONFORMING STRUCTURE: An determined by the Secretary of the Interior as meeting existing lawful structure or building which is not in the requirements for individual listing on the National conformity with the dimensional or structural • Register; requirements of this ordinance for the area of the (b) Certified or preliminarily determined by floodplain which it occupies. (For example, an the Secretary of the Interior as contributing to the existing residential structure in the floodfringe district • historical significance of a registered historic district is a conforming use. However, if the first floor is 7See also freeboard at s. 17.05(29). 8Annotation:As set forth federal rule,Oct. 1990. 9Annotation:As set forth federal rule,Oct. 1990. Page 79 Revised 4-30-97