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7/21/2017 Chapter 13 - Zoning Code http://library.amlegal.com/alpscripts/get-content.aspx 5/17 3. As an alternative, and consistent with Paragraph 2 above, dredge spoil disposal and sand and gravel operations may allow temporary, onsite storage of fill or other materials which would have caused an increase to the stages of the one hundred (100) year or regional flood but only after the City has received an appropriate plan which assures the removal of the materials from the floodway based upon the flood warning time available. The Conditional Use Permit shall be title registered with the property in the Office of the County Recorder. E. Accessory Structures. 1. Accessory structures shall not be designed for human habitation. 2. Accessory structures, if permitted, shall be constructed and placed on the building site so as to offer the minimum obstruction to the flow of flood waters. a) Whenever possible, structures shall be constructed with the longitudinal axis parallel to the direction of flood flow; and b) So far as practicable, structures shall be placed approximately on the same flood flow lines as those of adjoining structures. 3. Accessory structures shall be elevated or fill or structurally dry flood proofed in accordance with the FP-1 or FP-2 flood proofing classifications in the State Building Code. As an alternative, an accessory structure may be flood proofed to the FP-3 or FP-4 flood proofing classification in the State Building Code provided the accessory structure constitutes a minimal investment, does not exceed five hundred (500) square feet in size at its largest projections, and for a detached garage, the detached garage shall be used solely for parking of vehicles and limited storage. All flood proofed accessory structures shall meet the following additional standards: a) The structure shall be adequately anchored to prevent flotation, collapse or lateral movement of the structure and shall be designed to equalize hydrostatic flood forces on exterior walls; and b) Any mechanical and utility equipment in a structure shall be elevated to or above the Regulatory Flood Protection Elevation or properly flood proofed. c) To allow for the equalization of hydrostatic pressure, there must be a minimum of two "automatic" openings in the outside walls of the structure having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding. There must be openings on at least two sides of the structure and the bottom of all openings must be no higher than one foot above the lowest adjacent grade to the structure. Using human intervention to open a garage door prior to flooding will not satisfy this requirement for automatic openings. F. Storage of Materials and Equipment. 1. The storage or processing of materials that are, in time of flooding, flammable, explosive, or potentially injurious to human, animal, or plant life shall be prohibited. 2. Storage of other materials or equipment may be allowed if readily removable from the area within the time available after a flood warning and in accordance with a plan approved by the City Council. G. Structural works for flood control that will change the course, current or cross section of protected wetlands or public waters shall be subject to the provisions of Minnesota Statute, Section 103G. Community-wide structural works for flood control intended to remove areas from the regulatory flood plain shall not be allowed in the floodway. H. A levee, dike or floodwall constructed in the floodway shall not cause an increase to the 100-year or regional flood and the technical analysis shall assume equal conveyance or storage loss on both sides of a stream. Dr a f t 11 / 2 0 / 2 0 1 7