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

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1 (6) All new principal structures must have vehicular access at or above an elevation not more than 2 two feet below the regulatory flood protection elevation, or must have a flood 3 warning/emergency evacuation plan acceptable to the city. 4 (7) Accessory uses such as yards, railroad tracks, and parking lots may be at an elevation lower 5 than the regulatory flood protection elevation. However, any facilities used by employees or 6 the general public must be designed with a flood warning system that provides adequate time 7 for evacuation if the area is inundated to a depth and velocity such that the depth (in feet) 8 multiplied by the velocity(in feet per second)would exceed a product of four upon occurrence 9 of the regional (one percent chance)flood. 10 (8) Interference with normal manufacturing/industrial plant operations must be minimized, 11 especially along streams having protracted flood durations. In considering permit applications, 12 due consideration must be given to the needs of industries with operations that require a 13 floodplain location. 14 (9) Flood fringe developments must not adversely affect the hydraulic capacity of the channel and 15 adjoining floodplain of any tributary watercourse or drainage system. 16 (10) Manufactured homes and recreational vehicles must meet the standards of section 927. 17 (C) Conditional uses. The following uses and activities may be allowed as conditional uses, if allowed in 18 the underlying zoning district(s)or any applicable overlay district,following the procedures in section 19 928(D). conditional uses must meet the standards in subsections (D)(4) through (10) above and 20 section 924(D). 21 (1) Any structure that is not elevated on fill or floodproofed in accordance with section 924(B)(1)a. 22 and b. 23 (2) Storage of any material or equipment below the regulatory flood protection elevation. 24 (3) The cumulative placement of more than 1,000 cubic yards of fill when the fill is not being used 25 to elevate a structure in accordance with [subsection] (b)(1) above. 26 (D) Standards for flood fringe conditional uses. 27 (1) The standards listed in sections 924(B)(4)through (10) apply to all conditional uses. 28 (2) Basements,as defined in section 105,are subject to the following: 29 a. Residential basement construction is not allowed below the regulatory flood protection 30 elevation. 31 b. Non-residential basements may be allowed below the regulatory flood protection elevation 32 provided the basement is structurally dry floodproofed in accordance with section 924(D)(3). 33 (3) All areas of nonresidential structures, including basements,to be placed below the regulatory 34 flood protection elevation must be floodproofed in accordance with the structurally dry 35 floodproofing classifications in the Minnesota State Building Code. Structurally dry 36 floodproofing must meet the FP-1 or FP-2 floodproofing classification in the Minnesota State 37 Building Code, which requires making the structure watertight with the walls substantially 38 impermeable to the passage of water and with structural components capable of resisting 39 hydrostatic and hydrodynamic loads and the effects of buoyancy. Structures wet floodproofed 40 to the FP-3 or FP-4 classification are not permitted. 41 (4) The placement of more than 1,000 cubic yards of fill or other similar material on a parcel (other 42 than for the purpose of elevating a structure to the regulatory flood protection elevation) must 43 comply with an approved erosion/sedimentation control plan. 44 a. The plan must clearly specify methods to be used to stabilize the fill on site for a flood event 45 at a minimum of the regional (one percent chance)flood event. 46 b. The plan must be prepared and certified by a registered professional engineer or other 47 qualified individual acceptable to the city. 48 c. The plan may incorporate alternative procedures for removal of the material from the 49 floodplain if adequate flood warning time exists. Page 123 of 160