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acceptable flood plain uses include open space, golf <br />courses, and parking • surfaces located outside of <br />designated recharge areas with less than six inches of <br />flooding occurring over the surface. <br />(c) Encroachment within the 100 -year flood plain may <br />occur if all the following conditions exist: <br />(1) The flood plain storage volume after <br />encroachment is equal to or greater than the <br />flood plain storage volume prior to <br />encroachment (compensatory storage is <br />required) . <br />(2) This encroachment does not lie within the <br />floodway and does not result in a:violation of <br />the District's Wetland Alteration Rule F. <br />(3) Construction or development subject to <br />flood damage will have a minimum floor <br />elevation of two feet above the 100 -year flood <br />profile. <br />(4) Any structures, facilities, or embankments <br />within the flood plain will be capable of <br />passing the 100 -year flood without increasing <br />the elevation of the 100 -year flood profile or <br />creating excessive velocities as determined by <br />the District Engineer. <br />Permitting Rearuirements for Flood Plain Management Sector B <br />Sector B contains those subwatersheds where the percentage of flood <br />plain to total area is greater than twelve percent, and the <br />topography is characterized by a general slope condition of <br />predominantly less than twelve percent. Flood Plain Management <br />Sector B includes subwatersheds 1,2,3,6,9,10,11,12a and 12b. <br />(a) Construction of impervious areas will not be allowed <br />within the designated groundwater recharge areas of the <br />Prairie du Chien - Jordan formation except for road <br />construction, trails, and other recreational <br />improvements. <br />(b) To protect water quality and the conveyance capacity <br />of the flood plain, the District will not permit site <br />development which would involve the outside storage of <br />soluble, toxic, or buoyant materials. Examples of <br />acceptable flood plain uses include open space, golf <br />courses, and parking surfaces located outside of <br />designated recharge areas with less than six inches of <br />flooding occurring over the surface. <br />20 <br />