Agenda - Environmental Policy Board - 09/21/2015

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(5) b. Dredge spoil sites and sand and gravel operations shall not be allowed in the floodway unless a long-term site development plan is submitted which includes an erosion/sedimentation prevention element to the plan. c. As an alternative, and consistent with subsection (d)(4)b of this section, dredge spoil disposal and sand and gravel operations may allow temporary, on-site storage of fill or other materials which would have caused an increase to the stage of the 100 -year or regional flood but only after the city council has received an appropriate plan which ensures the removal of the materials from the floodway based upon the flood warning time available. The conditional use permit must be title registered with the property in the office of the county recorder. Accessory structures. a. Accessory structures shall not be designed for human habitation. b. Accessory structures, if permitted, shall be constructed and placed on the building site so as to offer the minimum obstruction to the flow of floodwaters. 1. Whenever possible, structures shall be constructed with the longitudinal axis parallel to the direction of flood flow; and 2. So far as practicable, structures shall be placed approximately on the same flood flow lines as those of adjoining structures. c. Accessory structures shall be elevated on fill or structurally dry floodproofed in accordance with the FP -1 or FP -2 floodproofing classifications in the state building code. As an alternative, an accessory structure may be floodproofed to the FP -3 or FP -4 floodproofing classification in the state building code provided the accessory structure constitutes a minimal investment, does not exceed 500 square feet in size, and for a detached garage, the detached garage must be used solely for parking of vehicles and limited storage. All floodproofed accessory structures must meet the following additional standards, as appropriate: 1. The structure must 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 2. Any mechanical and utility equipment in a structure must be elevated to or above the regulatory flood protection elevation or properly floodproofed. (6) Storage of materials and equipment. a. The storage or processing of materials that are, in time of flooding, flammable, explosive, or potentially injurious to human, animal, or plant life is prohibited. b. 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. 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 Minn. Stats. ch. 103G. Community- wide structural works for flood control intended to remove areas from the regulatory floodplain shall not be allowed in the floodway. (8) 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 must assume equal conveyance or storage loss on both sides of a stream. (7) (Code 1978, § 9.22.04; Ord. No. 79-13, 10-29-1979; Ord. No. 86-2, 8-25-1986; Ord. No. 92-07, 7-13-1992) Sec. 117-184. - Flood Fringe District (FF). Page 4