Ordinance - #23-14 - 11/14/2023 - Laserfiche WebLink

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1 in section 923(D), if otherwise allowed in the underlying zoning district or any applicable overlay 2 district. 3 (1) Structures accessory to the uses listed in section 923(A) and the uses listed in subsections (c)(2) 4 through (9) below. 5 (2) Extraction and storage of sand, gravel, and other materials. 6 (3) Marinas, boat rentals, docks, piers, wharves, and water control structures. 7 (4) Storage yards for equipment, machinery, or materials. 8 (5) Placement of fill or construction of fences that obstruct flood flows. Faiiu fences, as defined in 9 section 105, are peiniitted uses. 10 (6) Travel -ready recreational vehicles meeting the exception standards in section 927(D)(2). 11 (7) Levees or dikes intended to protect agricultural crops for a frequency flood event equal to or 12 less than the ten-year frequency flood event. 13 (D) Standards for floodway conditional uses: 14 (1) All uses. A conditional use must not cause any increase in the stage of the one percent chance 15 or regional flood or cause an increase in flood damages in the reach or reaches affected. 16 (2) Fill; storage of materials and equipment: 17 a. The storage or processing of materials that are, in time of flooding, flammable, explosive, 18 or potentially injurious to human, animal, or plant life is prohibited. 19 b. Fill, dredge spoil, and other similar materials deposited or stored in the floodplain must 20 be protected from erosion by vegetative cover, mulching, riprap or other acceptable 21 method. Permanent sand and gravel operations and similar uses must be covered by a 22 long-term site development plan. 23 c. Temporary placement of fill, other materials, or equipment which would cause an 24 increase to the stage of the one percent chance or regional flood may only be allowed if 25 the city has approved a plan that assures removal of the materials from the floodway 26 based upon the flood warning time available. 27 (3) Accessori' structures: 28 a. Accessory structures must not be designed for human habitation. 29 b. Accessory structures, if peiuiitted, must be constructed and placed on the building site 30 so as to offer the minimum obstruction to the flow of flood waters: 31 1. Whenever possible, structures must be constructed with the longitudinal axis 32 parallel to the direction of flood flow; and 33 2. So far as practicable, structures must be placed approximately on the same flood 34 flow lines as those of adjoining structures. 35 c. Accessory structures must be elevated on fill or structurally dry floodproofed in 36 accordance with the FP-1 or FP-2 floodproofing classifications in the Minnesota State 37 Building Code. All floodproofed accessory structures must meet the following additional 38 standards: 39 1. The structure must be adequately anchored to prevent flotation, collapse or lateral 40 movement and designed to equalize hydrostatic flood forces on exterior walls; and 41 2. Any mechanical and utility equipment in the structure must be elevated to or above 42 the regulatory flood protection elevation or properly floodproofed. 43 d. As an alternative, an accessory structure may be internally/wet floodproofed to the FP-3 or FP- 44 4 floodproofing classifications in the Minnesota State Building Code, provided the accessory 45 structure constitutes a minimal investment and does not exceed 576 square feet in size. A 46 detached garage may only be used for parking of vehicles and limited storage. All structures 47 must meet the following standards: 48 1. To allow for the equalization of hydrostatic pressure, there must be a minimum of two 49 "automatic" openings in the outside walls of the structure, with a total net area of not less 50 than one square inch for every square foot of enclosed area subject to flooding; and 51 2. There must be openings on at least two sides of the structure and the bottom of all 52 openings must be no higher than one foot above the lowest adjacent grade to the structure. Attachment A — Ordinance #23-14 Page 107 of 141