Agenda - Planning Commission - 04/27/2023

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1 (3) The cumulative placement of more than 1,000 cubic yards of fill when the fill is not being used 2 to elevate a structure in accordance with [subsection] (b)(1) above. 3 (D) Standards for flood fringe conditional uses. 4 (1) The standards listed in sections 117-184(b)(4)through (10) apply to all conditional uses. 5 (2) Basements, as defined in section 117-1, are subject to the following: 6 a. Residential basement construction is not allowed below the regulatory flood protection 7 elevation. 8 b. Non-residential basements may be allowed below the regulatory flood protection elevation 9 provided the basement is structurally dry floodproofed in accordance with [section] 117- 10 184(d)(3). 11 (3) All areas of nonresidential structures, including basements, to be placed below the regulatory 12 flood protection elevation must be floodproofed in accordance with the structurally dry 13 floodproofing classifications in the Minnesota State Building Code. Structurally dry 14 floodproofing must meet the FP-1 or FP-2 floodproofing classification in the Minnesota State 15 Building Code, which requires making the structure watertight with the walls substantially 16 impermeable to the passage of water and with structural components capable of resisting 17 hydrostatic and hydrodynamic loads and the effects of buoyancy. Structures wet floodproofed 18 to the FP-3 or FP-4 classification are not permitted. 19 (4) The placement of more than 1,000 cubic yards of fill or other similar material on a parcel (other 20 than for the purpose of elevating a structure to the regulatory flood protection elevation) must 21 comply with an approved erosion/sedimentation control plan. 22 a. The plan must clearly specify methods to be used to stabilize the fill on site for a flood event 23 at a minimum of the regional (one percent chance)flood event. 24 b. The plan must be prepared and certified by a registered professional engineer or other 25 qualified individual acceptable to the city. 26 c. The plan may incorporate alternative procedures for removal of the material from the 27 floodplain if adequate flood warning time exists. 28 (5) Storage of materials and equipment below the regulatory flood protection elevation must 29 comply with an approved emergency plan providing for removal of such materials within the 30 time available after a flood warning. 31 (6) Alternative elevation methods other than the use of fill may be utilized to elevate a structure's 32 lowest floor above the regulatory flood protection elevation. These alternative methods may 33 include the use of stilts, pilings, parallel walls,etc.,or above-grade,enclosed areas such as crawl 34 spaces or tuck under garages.The base or floor of an enclosed area shall be considered above- 35 grade and not a structure's basement or lowest floor if: 36 a. The enclosed area is above-grade on at least one side of the structure. 37 b. It is designed to internally flood and is constructed with flood resistant materials. 38 c. It is used solely for parking of vehicles,building access or storage.The above-noted alternative 39 elevation methods are subject to the following additional standards: 40 1. Design and certification. The structure's design and as-built condition must be certified 41 by a registered professional engineer or architect as being in compliance with the general 42 design standards of the Minnesota State Building Code and,specifically,that all electrical, 43 heating,ventilation, plumbing and air conditioning equipment and other service facilities 44 must be at or above the regulatory flood protection elevation or be designed to prevent 45 flood water from entering or accumulating within these components during times of 46 flooding. 47 2. Specific standards for above-grade, enclosed areas. Above-grade, fully enclosed areas 48 such as crawl spaces or tuck under garages must be designed to internally flood and the 49 design plans must stipulate: Page 118 of 147