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17-19 floodplain storage wilt decrease the regional flood and securing the department of natural- resources- elevation, provided that: approval for such amendments. (a) The department of natural, resources ,(6) Determination of flood protection elevations approves the methodology used to analyze and effects of proposed development upon flood floodplain storage to determine revised regional heights, velocity and storage. (a) For all • flood elevations. subdivision proposals, as defined in §236.02(8), (b) The municipality adopts required standards Wis. Stats., and for other land divisions or pertaining to the flood storage district, pursuant to proposed developments which have a total area chapter NR 116,Wisconsin Administrative Code. that exceeds 5 acres or which have an estimated (3) Applicability. The provisions of this section cost that exceeds $125,000, the applicant shall apply to all areas within the flood storage district, provide all the computations which are required to as shown on the official floodplain zoning maps, show the effect of the proposal on flood heights, and to those portions of the general floodplain velocities and floodplain storage. district that are determined to be in the flood , (b) For land divisions and proposed storage area. developments which do not exceed 5 acres in area (4) Development in flood storage district. (a) and which have an estimated cost of $125,000 or • Development in a flood storage district shall not less, if the regional flood profile has not been cause an increase equal to or greater than 0.01 of a determined, the municipality may transmit the 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 storage as defined by the ground surface and the 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. (a) Excavation below the groundwater table is not Residential: All residential structures shall meet . considered as providing an equal volume of the following standards: storage. 1. The first floor of a structure to be erected, 1. No area in the floodplain may be removed constructed, reconstructed or moved on the from the flood storage district unless it can be floodplain shall be constructed on fill at or above shown that the area has been filled to the flood the flood protection elevation for the particular protection elevation and is contiguous to other area. The fill shall be not less than one foot below lands lying outside the floodplain. the flood protection elevation for the particular 2. If compensatory storage cannot be provided, area and the fill shall extend at such elevation at the area may not be developed unless the entire least 15 feet beyond the limits of any structure or affected flood storage area is rezoned to the building erected thereon and shall be contiguous floodfringe district. to land which is outside of the floodplain and/or is (c) A flood zone permit from the Dane County accessible by rescue and relief vehicles during the Zoning Administrator is required for any regional flood. development in a flood storage district. 2. The basement floor shall be at or above the (5) Rezone from flood storage district to regional flood elevation, unless a community wide floodfringe district. (a) Department of natural exemption allowing flood proofing of basements resources approval of any project that results in an has been granted by the Federal Insurance increase in the height of the regional flood shall be Administration (FIA) of the Federal Emergency secured prior to the submitting of a petition to Management Agency (FEMA). rezone. (b) Commercial, manufacturing and industrial. (b) The effect of rezoning from the flood storage 1. Principal buildings which are to be erected, district to the floodfringe district shall be calculated constructed, reconstructed, added to or moved into by comparing the current flood profile to the flood a flood storage area shall be elevated or profile determined by assuming that the area to be flood-proofed to two feet above the regional flood rezoned is not available to store floodwater. elevation. Measures shall be taken to minimize (c) The zoning maps for the flood storage interference with normal plant operations, district may not be• amended without first especially for plants located on streams having amending the applicable portions of the water protracted flood durations. V surface profiles and floodplain zoning ordinances rev. 043095