Agenda - Council Work Session - 10/17/2023 - Special

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1 (2) With the exception of the uses listed in section 923(A)(5), the use must not obstruct flood 2 flows or increase flood elevations and must not involve structures, fill, obstructions, 3 excavations or storage of materials or equipment. 4 (3) Any facility that will be used by employees or the general public must be designed with a flood 5 warning system that provides adequate time for evacuation if the area is inundated to a depth 6 and velocity such that the depth (in feet) multiplied by the velocity(in feet per second)would 7 exceed a product of four upon occurrence of the regional (one percent chance)flood. 8 (C) Conditional uses. The following uses may be allowed as conditional uses following the standards 9 and procedures set forth in section 931(D) of this subdivision and further subject to the standards 10 set forth in section 923(D), if otherwise allowed in the underlying zoning district or any applicable 11 overlay district. 12 (1) Structures accessory to the uses listed in section 923(A) and the uses listed in subsections 13 (c)(2)through (9) below. 14 (2) Extraction and storage of sand,gravel, and other materials. 15 (3) Marinas, boat rentals, docks, piers,wharves, and water control structures. 16 (4) Storage yards for equipment, machinery, or materials. 17 (5) Placement of fill or construction of fences that obstruct flood flows. Farm fences, as defined 18 in section 105,are permitted uses. 19 (6) Travel-ready recreational vehicles meeting the exception standards in section 927(D)(2). 20 (7) Levees or dikes intended to protect agricultural crops for a frequency flood event equal to or 21 less than the ten-year frequency flood event. 22 (D) Standards for floodway conditional uses: 23 (1) All uses. A conditional use must not cause any increase in the stage of the one percent chance 24 or regional flood or cause an increase in flood damages in the reach or reaches affected. 25 (2) Fill;storage of materials and equipment: 26 a. The storage or processing of materials that are, in time of flooding, flammable, 27 explosive, or potentially injurious to human, animal, or plant life is prohibited. 28 b. Fill,dredge spoil,and other similar materials deposited or stored in the floodplain must 29 be protected from erosion by vegetative cover, mulching, riprap or other acceptable 30 method. Permanent sand and gravel operations and similar uses must be covered by a 31 long-term site development plan. 32 C. Temporary placement of fill, other materials, or equipment which would cause an 33 increase to the stage of the one percent chance or regional flood may only be allowed 34 if the city has approved a plan that assures removal of the materials from the floodway 35 based upon the flood warning time available. 36 (3) Accessory structures: 37 a. Accessory structures must not be designed for human habitation. 38 b. Accessory structures, if permitted, must be constructed and placed on the building site 39 so as to offer the minimum obstruction to the flow of flood waters: 40 1. Whenever possible, structures must be constructed with the longitudinal axis 41 parallel to the direction of flood flow; and 42 2. So far as practicable,structures must be placed approximately on the same flood 43 flow lines as those of adjoining structures. 44 C. Accessory structures must be elevated on fill or structurally dry floodproofed in 45 accordance with the FP-1 or FP-2 floodproofing classifications in the Minnesota State 46 Building Code.All floodproofed accessory structures must meet the following additional 47 standards: Page 121 of 160