§ 154.006 GENERAL FLOOD PLAIN OVERLAY DISTRICT.
   (A)   Permitted uses.
      (1)   The uses listed in § 154.004(A) of this chapter shall be permitted uses.
      (2)   All other uses shall be subject to the floodway/flood fringe evaluation criteria pursuant to division (B) below. Section 154.004 shall apply if the proposed use is in the Floodway District and § 154.005 shall apply if the proposed use is in the Flood Fringe District.
   (B)   Procedures for floodway and flood fringe determinations for streams within the General Flood Plain District.
      (1)   Upon receipt of an application for a permit or other approval from the city within the General Flood Plain District, the applicant shall be required to furnish the following information as deemed necessary by the Community Development Department for the determination of the regulatory flood protection elevation and whether the proposed use is within the Floodway or Flood Fringe Overlay District.
         (a)   A typical valley cross-section(s) showing the channel of the stream, elevation of land areas adjoining each side of the channel, cross-sectional areas to be occupied by the proposed development, and high water information, if determined to be necessary by the city.
         (b)   Survey showing elevations or contours of the ground, pertinent structure, fill, or storage elevations, the size, location, and spatial arrangement of all proposed and existing structures on the site, and the location and elevations of streets.
         (c)   Photographs showing existing land uses, vegetation upstream and downstream, and soil types, if determined to be necessary by the city.
         (d)   Profile showing the slope of the bottom of the channel or flow line of the stream for at least 500 feet in either direction from the proposed development, if determined to be necessary by the city.
         (e)   Other necessary information as requested by the city.
      (2)   The applicant shall be responsible to submit 1 or more copies of the above information to a designated engineer or other expert person or agency for technical assistance in determining whether the proposed use is in the Floodway or Flood Fringe District and to determine the regulatory flood protection elevation. Procedures consistent with Minnesota Regulations 1983, Parts 6120.5000 - 6120.6200 and 44 Code of Federal Regulations Part 65 shall be followed in this expert evaluation. The designated engineer or expert is strongly encouraged to discuss the proposed technical evaluation methodology with the respective Department of Natural Resources’ Area Hydrologist prior to commencing the analysis. The designated engineer or expert shall:
         (a)   Estimate the peak discharge of the regional 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 .5 foot. A lesser stage increase than .5 foot shall be required if, as a result of the additional stage increase, increased flood damages would result. An equal degree of encroachment on both sides of the stream within the reach shall be assumed in computing floodway boundaries.
      (3)   The Community Development Department, Building Department, and/or City Engineer must formally accept the technical evaluation and the recommended Floodway and/or Flood Fringe District boundary or deny the permit application. The city may submit the application and all supporting data and analyses to the Federal Emergency Management Agency or the Department of Natural Resources. Once the Floodway and Flood Fringe District boundaries have been determined, the Community Development Department shall process the permit application consistent with the applicable provisions of §§ 154.004 and 154.005 of this chapter.
(Ord. 597, passed 7-12-2010) Penalty, see § 154.999