August Dane County Code of Ordinances

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2a-65 Zoning 11.20 LI (p) Flood Hazard Boundary Map. A map safety usually expressed in terms of a certain prepared by the U.S. Department of Hous- amount of feet above a calculated flood f J, ing and Urban Development, designating level. Freeboard compensates for the many areas of special flood hazard within a given unknown factors that contribute to flood community. Flood hazard areas are desig- heights greater than the height calculated. P nated as A Zones. Said map forms the basis These unknown factors include, but are not - -- for both the regulatory and insurance limited to, ice jams, debris accumulation, aspects of the National Flood Insurance pro- wave action, obstruction of bridge openings grams. and floodways, the effects of urbanization �_ on the hydrology of the watershed, loss of (q) Flood Insurance Study Map. A map flood storage areas due to development and prepared by the U.S. Department of Hous- aggradation of the river or stream bed. J ing and Urban Development, designating areas of special flood hazard and flood in- (x) Land Use. Any "development" as de- 1 surance rate zones for a given community. fined in 11.20(1)(i). IJ Flood hazard and insurance rate zones are designated as A zones. Said maps form the (y) Mobile Home. A structure .transport- basis for the regulatory and/or the insurance able in one or more sections, which is built aspects of the National Flood Insurance on a permanent chassis and designed to be . I Program. used with or without a permanent founda- tion when connected to the required utilities. .(r) Flood Plain. The flood plain is the land For the purpose of this ordinance it does not r which has been or may be hereafter covered include recreational vehicles or travel trail- by flood water during the regional flood. ers. The flood plain includes the floodway and I the flood fringe. (ya) Navigable Waters means Lake Superior, -- Lake Michigan, all natural inland lakes within (s) Flood Profile. A graph or a longitudinal Wisconsin and all streams, ponds, sloughs, I profile showing the relationship of the water flowages and other waters within the territorial surface elevation of a flood event to loca- limits of this state, including the Wisconsin tions along a stream or river. portion of boundary waters, which are navi- ' gable under the laws of this state. Under • (t) Flood Proofing. Flood proofing in- Section 144.26(2)(d), Wisconsin Statutes, not- volves any combination of structural provi- withstanding any other provision of law or sions, changes, or adjustment to properties administrative rule promulgated thereunder, ' and structures subject to flooding primarily shoreland ordinances required under section -- for the purpose of reducing or eliminating 59.971, Wisconsin Statutes, and Chapter NR flood damage to properties, water and sane- 115, Wisconsin Administration Code, do not I tart' facilities, structures and contents of apply to lands adjacent to farm drainage buildings in flood hazard areas. ditches if: (u) Flood Protection Elevation. The flood (1) Such lands are not adjacent to a natural I protection elevation shall correspond to a navigable stream or river; point two feet of freeboard above the water I surface profile associated with the regional (2) Those parts of such drainage ditches flood and the official floodway lines. (See adjacent to such lands were non-navigable - also: "freeboard".) streams before ditching or had no previous stream history; and I (v) Floodway. The floodway is the channel _ of a river or stream and those portions of the (3) Such lands are maintained in non- flood plain adjoining the channel required to structual agricultural use. 1 carry and discharge the flood water of flood _fE flows associated with the regional flood. (yb) Non-Conforming Structure. An exist- ing lawful structure orbuilding which is not (w) Freeboard. Freeboard is a factor' of in conformity with the provisions of the II Stipp.No.4,4-84 I