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Chapter 17 (5) Rezone from Flood Storage District to Floodfringe District. SUBCHAPTER VIII (a) Department of Natural Resources FLOOD STORAGE DISTRICT approval of any project that results in an increase in the height of the regional flood shall be secured prior 17.81 FLOOD STORAGE DISTRICT. (1)Intent to the submitting of a petition to rezone. and Purpose. The Flood Storage District delineates (b) The effect of rezoning from the flood that portion of the floodplain where storage of flood storage district to the flood fringe district shall be waters has been taken into account. The district calculated by comparing the current flood profile to provides for the protection of the storage areas and the flood profile determined by assuming that the -- assures that development in the storage areas will area to be rezoned is not available to store flood not cause higher floodplain elevations. water. (2) Criteria for establishing flood storage (c) The zoning maps for the flood storage districts. A "Flood storage district" may be district may not be amended without first amending established for the area landward of the floodway in the applicable portions of the water surface profiles lieu of the floodfringe designation where floodplain and floodplain zoning ordinances and securing the storage will decrease the regional flood elevation, Department of Natural Resources approval for such provided that: amendments. (a) The Department of Natural Resources (6) Determination of Flood Protection Elevations approves the methodology used to analyze floodplain and Effects of Proposed Development Upon Flood storage to determine revised regional flood Heights, Velocity and Storage. elevations. (a) For all subdivision proposals, as defined in (b) The municipality adopts required §236.02(8), Statutes, and for other land divisions or standards pertaining to the flood storage district, proposed developments which have a total area that pursuant to Chapter NR 116 Wisconsin exceeds 5 acres or which have an estimated cost that Administrative Code. exceeds$125,000, the applicant shall provide all the (3) Applicability. The provisions of this section computations which are required to show the effect apply to all areas within the flood storage district, as of the proposal on flood heights,velocities, and flood shown on the official floodplain zoning maps, and to plain storage. those portions of the general floodplain district that (b) For land divisions and proposed are determined to be in the flood storage area. developments which do not exceed 5 acres in area (4) Development in Flood Storage District. and which have an estimated cost of $125,000 or (a) Development in a flood storage district less, if the regional flood profile has not been shall not cause an increase equal to or greater than determined, the municipality may transmit the 0.01 of a foot in the height of the regional flood. information required to the Department of Natural (b) When any proposed development would Resources for a determination of flood protection remove flood storage volume, an equal volume of elevations and for an evaluation of the effects of the storage as defined by the ground surface and the proposal upon flood heights, velocities and regional flood elevation shall be provided to floodplain storage. compensate for the volume of storage which is lost. (7) Permitted Uses in Flood Storage District. Excavation below the groundwater table is not (a) Residential: All residential structures considered as providing an equal volume of storage. shall meet the following standards: 1. No area in the floodplain may be removed 1. The first floor of a structure to be erected, from the flood storage district unless it can be shown constructed, reconstructed, or moved on the flood that the area has been filled to the flood protection plain shall be constructed on fill at or above the flood elevation and is contiguous to other lands lying protection elevation for the particular area. The fill outside the floodplain. shall be not less than one foot below the flood 2. If compensatory storage cannot be provided, protection elevation for the particular area and the the area may not be developed unless the entire fill shall extend at such elevation at least 15 feet affected flood storage area is rezoned to the beyond the limits of any structure or building erected floodfringe district. thereon and shall be contiguous to land which is (c) A flood zone permit from the Dane outside of the flood plain and/or is accessible by County Zoning Administrator is required for any rescue and relief vehicles during the regional flood. development in a flood storage district. 2. The basement floor shall be at or above the regional flood elevation, unless a community wide Page 90