(A) Upon receipt of an application for a development for a use within a Flood Hazard Overlay, the applicant is required to furnish as is applicable to the application as determined by the City Manager for the determination of the regulatory flood protection elevation and whether the proposed use is within the flood way or flood fringe. If the proposed use is located within the flood way, § 152.513 of this chapter applies. If the proposed use is located in the flood fringe, § 152.514 of this chapter applies.
(1) A typical valley cross-section 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.
(2) Plan (surface view) showing the following:
(a) Elevations or contours of the ground.
(b) Pertinent structure, fill, or storage elevations.
(c) The size, location, and spatial arrangement of all proposed and existing structures on the site.
(d) Location and spatial arrangement of all proposed and existing structures on the site.
(e) The location and elevations of streets.
(f) Photographs showing existing land uses and vegetation upstream and downstream.
(g) The soil type(s).
(3) 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.
(B) The applicant must be responsible to submit a copy 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 flood way or flood fringe and to determine the regulatory flood protection elevation. Procedures consistent with Minnesota Rules parts 6120.5000 - 6120.6200 must 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 must:
(1) Estimate the peak discharge of the regional flood.
(2) Calculate the water surface profile of the regional flood based upon a hydraulic analysis of the stream channel and overbank areas.
(3) Compute the floodway necessary to convey or store the regional flood without increasing flood stages and providing compensation storage volumes on a 1:1 basis below the 100-year flood elevation. An equal degree of encroachment on both sides of a stream within the reach must be assumed in computing floodway boundaries.
(C) The City Manager must present the technical evaluation and findings of the designated engineer or expert to the Board of Adjustment and Appeals. The board may formally accept the technical evaluation and the recommended floodway and flood fringe delineations for the Flood Hazard Overlay Area or deny the permit. The Board, prior to official action, must submit the application and all supporting data and analyses to the Federal Emergency Management Agency and Department of Natural Resources for review and comment. Once the flood way and flood fringe boundaries have been determined, the Board will refer the matter back to the City Manager who will process the permit application consistent with the applicable provisions of §§ 152.030 through 152.039 of this chapter.
(Ord. 2000-936; Am. Ord. 2005-1033, passed 2-7-05)