Agenda - Planning Commission - 07/27/2023

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1 a. All service utilities, including ductwork, must be elevated or water -tight to prevent infiltration 2 of floodwaters. 3 b. As an alternative to elevation on fill, an accessory structure that constitutes a minimal 4 investment and that does not exceed 576 square feet in size may be internally floodproofed 5 in accordance with section 923(D)(3). 6 (2) The cumulative placement of fill or similar material on a parcel must not exceed 1,000 cubic 7 yards, unless the fill is specifically intended to elevate a structure in accordance with subsection 8 (a) above, or if allowed as a conditional use under section 924(C)(3) below. 9 (3) The storage of any materials or equipment must be elevated on fill to the regulatory flood 10 protection elevation. 11 (4) The storage or processing of materials that are, in time of flooding, flammable, explosive, or 12 potentially injurious to human, animal, or plant life is prohibited. 13 (5) Fill must be properly compacted and the slopes must be properly protected by the use of riprap, 14 vegetative cover or other acceptable method. 15 (6) All new principal structures must have vehicular access at or above an elevation not more than 16 two feet below the regulatory flood protection elevation, or must have a flood 17 warning/emergency evacuation plan acceptable to the city. 18 (7) Accessory uses such as yards, railroad tracks, and parking lots may be at an elevation lower 19 than the regulatory flood protection elevation. However, any facilities used by employees or 20 the general public must be designed with a flood warning system that provides adequate time 21 for evacuation if the area is inundated to a depth and velocity such that the depth (in feet) 22 multiplied by the velocity (in feet per second) would exceed a product of four upon occurrence 23 of the regional (one percent chance) flood. 24 (8) Interference with normal manufacturing/industrial plant operations must be minimized, 25 especially along streams having protracted flood durations. In considering permit applications, 26 due consideration must be given to the needs of industries with operations that require a 27 floodplain location. 28 (9) Flood fringe developments must not adversely affect the hydraulic capacity of the channel and 29 adjoining floodplain of any tributary watercourse or drainage system. 30 (10) Manufactured homes and recreational vehicles must meet the standards of section 927. 31 (C) Conditional uses. The following uses and activities may be allowed as conditional uses, if allowed in 32 the underlying zoning district(s) or any applicable overlay district, following the procedures in section 33 928(D). conditional uses must meet the standards in subsections (D)(4) through (10) above and 34 section 924(D). 35 (1) Any structure that is not elevated on fill or floodproofed in accordance with section 924(B)(1)a. 36 and b. 37 (2) Storage of any material or equipment below the regulatory flood protection elevation. 38 (3) The cumulative placement of more than 1,000 cubic yards of fill when the fill is not being used 39 to elevate a structure in accordance with [subsection] (b)(1) above. 40 (D) Standards for flood fringe conditional uses. 41 (1) The standards listed in sections 924(6)(4) through (10) apply to all conditional uses. 42 (2) Basements, as defined in section 105, are subject to the following: 43 a. Residential basement construction is not allowed below the regulatory flood protection 44 elevation. 45 b. Non-residential basements may be allowed below the regulatory flood protection elevation 46 provided the basement is structurally dry floodproofed in accordance with section 924(D)(3). 47 (3) All areas of nonresidential structures, including basements, to be placed below the regulatory 48 flood protection elevation must be floodproofed in accordance with the structurally dry 49 floodproofing classifications in the Minnesota State Building Code. Structurally dry Page 123 of 160