Ordinance - #15-15 - 11/24/2015 - Laserfiche WebLink

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one square inch for every square foot of enclosed area subject toflooding unless a registered professional engineer or architect certifies that a smaller net area would suffice. The automatic openings may be equipped with screens, louvers, valves, or other coverings or devices provided that they permit the automatic entry and exit of flood waters without any form of human intervention; and ii. That the enclosed area will be designed of flood resistant materials in accordance with the FP-3 or FP-4 classifications in the MN State Building Code and shall be used solely for building access, parking of vehicles, or storage. Sec. 117-185 General Floodplain Distirct (GF) (a) Permitted Uses. (1) The uses listed in 117-183 (a), Floodway District Permitted Uses, are permitted uses. (2) All other uses are subject to the floodway/flood fringe evaluation criteria specified in 117-185 (b) below. Section 117-183 applies if the proposed use is determined to be in the Floodway District. Section 117-184 applies if the proposed use is determined to be in the Flood Fringe District. (b) Procedures for Floodway and Flood Fringe Determinations. (1) Upon receipt of an application for a permit or other approval within the General Floodplain District, the Zoning Administrator must obtain, review and reasonably utilize any regional flood elevation and floodway data available from a federal, state, or other source. (2) If regional flood elevation and floodway data are not readily available, the applicant must furnish additional information, as needed, to determine the regulatory flood protection elevation and whether the proposed use would fall within the Floodway or Flood Fringe District. Information must be consistent with accepted hydrological and hydraulic engineering standards and the standards in 117-185 (b)(3) below. (3) The determination of floodway and flood fringe must include the following components, as applicable: a. Estimate the peak discharge of the regional (1% chance) flood. b. Calculate the water surface profile of the regional flood based upon a hydraulic analysis of the stream channel and overbank areas. c. Compute the floodway necessary to convey or store the regional flood without increasing flood stages more than one-half (0.5) foot. A lesser stage increase than 0.5 foot is required if, as a result of the stage increase, increased flood damages would result. An equal degree of encroachment on both sides of the stream within the reach must be assumed in computing floodway boundaries. (4) The Zoning Administrator will review the submitted information and assess the technical evaluation and the recommended Floodway and/or Flood Fringe District boundary. The assessment must include the cumulative effects of previous floodway encroachments. The Zoning Administrator may seek technical assistance from a designated engineer or other expert person or agency, including the MN Department of Natural Resources, before presenting the technical evaluation and findings to the City Council. The City Council must formally accept the technical evaluation and the recommended floodway and/or flood fringe district boundary or deny the permit application. The City Council, prior to official action, may submit the application and all supporting data and analyses to the Federal Emergency Management Agency (FEMA), the MN Department of Natural Resources, or the Planning Commission for review and comment. (5) Once the Floodway and Flood Fringe District boundaries have been determined, the City Council shall refer the matter back to the Zoning Administrator to process the permit application consistent with the applicable provisions of Section 117-183 and 117-184. Sec. 117-186 Subdivisions