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. SECTION 10.31; 10.32; 10.33 (10) Flood Stage: For purposes of this Section the term is used to mean the height or elevation of a flood as referred to some datum. For other purposes it is commonly used to refer to the elevation at which,a stream will overtop its normal stage banks. (11) Ordinary High Water Mark: The highest point on the bank of a normal stage channel at which the water level has been for a sufficient period of time to leave a definite mark. (12) Reach: A hydraulic engineering term to describe longitudinal segments of a stream or river. A reach will generally include the segment of the flood plain where flood heights are primarily controlled by man-made or natural flood plain obstructions or restrictions. In an urban area, the segment of a stream or river between two consecutive bridge crossings would most likely be a reach. (13) Regional Flood: The regional flood is a flood determined by the Division of Environmental Protection which is representative of large floods known to have occurred generally in Wisconsin and reasonably charac- teristic of what can be expected to occur on a particular stream. The regional flood generally has an average frequency in the order of the one hundred (100) year recurrence interval flood determined from an analysis of floods on a particular stream and other streams in the same general region. (14) Standard Project Flood: A hypothetical flood, estimated by the Corps of Engineers, representing the critical flood runoff volume and peak discharge that may be expected from the most severe combination of meterological and hydrologic conditions that are considered reasonably characteristic of.the geograph- ical region involved, excluding extremely rare combinations. (15) Storage Capacity of a Flood Plain: The volume of space above an area of flood plain land that can be occupied by flood water of a given stage at a given time, regardless of whether the water is moving. (16) Structure: Anything constructed or erected, the use of which requires a more or less permanent location on or in the ground. Includes but is not limited to objects such as buildings, factories, sheds and cabins. a. Permanent Structure: A structure which is built of such materials and in such a way that it would commonly be expected to last and remain useful for a substantial period of time. b. Temporary Structure: A structure which is built of such materials and in such a way.that it would commonly be expected to have a relatively short useful life, or is built for a purpose that would commonly be expected to be relatively short-term. 110.32 GENERAL PROVISIONS ' (a) Jurisdiction: The jurisdiction of this Section.includes all lands, adjacent to each navigable reach of river or stream within the boundaries of Dane County, Wisconsin, that would be inundated by the regional flood. (b) District Boundaries: The boundaries of the general flood plain district shall be as they appear on the Zoning District Maps on file in the office of the Dane County Zoning Supervisor. (1) The Flood Plain District boundary shall be subject to the provisions of 10.03 of the Zoning Ordinance. (2) Compliance with the provisions of this Section shall not be grounds for the removal of lands from the flood plain district unless such lands are filled to a height of at least two feet above the elevation of the standard project flood for the particular area and are contiguous to other lands lying outside the flood plain district. (c) Effect of Flood Plain District Regulations: The regulations set forth in this Section for the flood plain district shall apply only to the flood plains mapped on the official zoning map and shall be void and of no effect in areas not mapped as being included in the flood plain districts. The regulations of this Section shall be construed as being supplementary to the regulations imposed on the same lands by an under- lying zoning ordinance. When flood plain and underlying zoning ordinance regulations conflict with one another, the most restrictive combination of such regulations shall govern. (d) Compliance: No structure,.land or water, shall hereafter be used and no structure shall be located, extended, converted or structurally altered without full compliance with the terms of this Section and other applicable regulations. (e) Non-Conforming Uses: Non-conforming uses may be continued subject to provision of 10.21 of the Zoning Ordinance. ' 10.33 FLOOD PLAIN DISTRICT (a) Special Provisions: The following regulations shall apply to all uses within the General Flood Plain District, notwithstanding that such uses may be specifically permitted under the terms of this Section. (1) The flood protection elevation or height shall correspond to a point two (2) feet above the elevation of flood profile shown on or attached to the flood map for a particular area. When flood elevations or flood profiles are not available for delineated flood plains the flood protection level shall be two (2) feet above the estimated regional flood elevation as determined through the special exception procedures in Section 10.35 (c) of this Section. - 29 -