August Dane County Code of Ordinances

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11.20 Dane County Code 2a-66 flood plain zoning ordinance for the area of (dd) Regional Flood. The regional flood is the flood plain which it occupies (e.g., an ex- a flood determined to be representative of istinp residential structure in the flood fringe large floods known to have generally oc- district is a conforming use; however, if the curred in Wisconsin and which may be ex- i first floor is lower than the flood rotection pected to occur on a particular 'stream be- elevation, the structure is non-conforming). cause of like physical-characteristics. The - flood frequency of the regional flood is once (z) Non-Conforming Use. A non-conform- in every 100 years; this means that in any ing use is an existing lawful use of a struc- given year there is a 1% chance that the re- - ture, building or accessory use which is not gional flood may occur or be exceeded. Dur- in conformity with the provisions of the ing a typical 30-year mortgage period, the re- flood plain zoning ordinance for the area of gional flood has a 26% chance of occurrence. the flood plain which it occupies. (dda) Special Exception means a use which -• (aa) Official Flood Plain Zoning Map. is permitted by this ordinance provided that That map, adopted and made part of this or- certain conditions are met and that a permit dinance, which has been approved by the is granted by the Board of Adjustment. Department of Natural Resources and the Federal Insurance Administration of FEMA (ee) Storage Capacity of a Flood Plain. - and which delineates those areas which The volume of space above an area of flood would be inundated by the base or regional plain land that can be occupied by flood flood, including but not limited to numbered water of a given stage at a given time, re- and unnumbered A Zones, and where appli- gardless of whether the water is moving. cable, floodways. This map may be a Flood Hazard Boundary Map (see 11.10 (1)(g), or (ff) Structure. Anything constructed or other approved community flood plain erected, the use of which requires a perma- map.) nent or temporary location on or in the . ground, stream bed or lake bed, which in- (bb) Official Letter of Map Amendment. eludes, but is not limited to, objects such as Official notification from the Federal Insur- buildings, factories, sheds and cabins, mo- ance Administration Office of FEMA that a bile homes, gas or liquid storage tanks, Flood Hazard Boundary Map or Flood In- bridges or culverts. -- surance Study Map has been amended. (gg) Substantial Improvements. Any re- (bba) Ordinary high water mark means the pair, re-construction, or improvement of a point on the bank or shore up to which the structure, the cost of which equals or exceeds presence and action of surface water is so con- fifty percent (50%) of the present assessed tinuous as to leave a distinctive mark such as value of the structure either before the-im- by erosion, destruction or prevention of ter- provement or repair is started, or if the —,- restrial vegetation, predominance of aquatic structure has been damaged, and is being re- vegetation, or other easily recognized char- stored, before the damage occurred. -'The acteristics. term does not, however, include either: (I) any project for improvement of a structure ■ . (cc) Reach, Hydraulic. A hydraulic reach to comply with existing state or local health, along river or stream is that portion of the sanitary, or safety code specifications which river or stream extending from one signifi- are solely necessary to assure safe living cant change in the hydraulic character of the conditions, or (II) any alteration of a struc- river or stream to the next significant cure or site documented as deserving preser- change. These changes are usually associated vation by the Wisconsin State Historical with breaks in the slope of the water surface Society or listed on the National Register of i profile, and may be caused by bridges, dams, Historic Places. Ordinary maintenance re- , expansion and contraction of the water flow, pairs are not considered structural repairs, -- and changes in stream bed slope or vegeta- modifications, or additions; such ordinary tion. • Supp.No.4,4-84