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7/21/2017 Chapter 13 - Zoning Code http://library.amlegal.com/alpscripts/get-content.aspx 7/17 2. Specific Standards for Above-Grade, Enclosed Areas. Above grade, fully enclosed areas such as crawl spaces or tuck under garages shall be designed to internally flood and the design plans shall stipulate: a) The minimum area of openings in the walls where internal flooding is to be used as a flood proofing technique. There shall be a minimum of two openings on at least two sides of the structure and the bottom of all openings shall be no higher than one-foot above grade. The automatic openings shall have a minimum net area of not less than one square inch for every square foot of enclosed area subject to flooding unless a registered professional engineer or architect certifies that a smaller net area would suffice. The automatic openings may be equipped with screens, louvers, valves, or other coverings or devices provided that they permit the automatic entry and exit of flood waters without any form of human intervention; and b) That the enclosed area shall be designed of flood resistant materials in accordance with the FP-3 or FP-4 classifications in the State Building Code and shall be used solely for building access, parking of vehicles or storage. C. Basements, as defined by this Section, shall be subject to the following: 1. Residential basement construction shall not be allowed below the Regulatory Flood Protection Elevation. 2. Non-residential basements may be allowed below the Regulatory Flood Protection Elevation provided the basement is structurally dry flood proofed in accordance with this Section. D. All areas of non-residential structures including basements to be placed below the Regulatory Flood Protection Elevation shall be flood proofed in accordance with the structurally dry flood proofing classifications in the State Building Code. Structurally dry flood proofing shall meet the FP-1 or FP-2 flood proofing classification in the State Building Code and this shall require making the structure watertight with the walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and the effects of buoyancy. Structures flood proofed to the FP-3 and FP-4 classification shall not be permitted. E. When at any one time more than one thousand (1,000) cubic yards of fill or other similar material is located on a parcel for such activities as on-site storage, landscaping, sand and gravel operations, landfills, roads, dredge spoil disposal or construction of flood control works, an erosion/sedimentation control plan shall be submitted unless the community is enforcing a State-approved shoreland management ordinance. In the absence of a State-approved shoreland ordinance, the plan shall clearly specify methods to be used to stabilize the fill on site for a flood event at a minimum of the 100-year or regional flood event. The plan shall be prepared and certified by a registered professional engineer or other qualified individual acceptable to the City. The plan may incorporate alternative procedures for removal of the material from the flood plain if adequate flood warning time exists. F. Storage of Materials and Equipment. 1. The storage or processing of materials that are, in time of flooding, flammable, explosive, or potentially injurious to human, animal, or plant life shall be prohibited. 2. Storage of other materials may be allowed if readily removable from the area within the time available after a flood warning and in accordance with a plan approved by the City Council. Subd. 5 Standards for All Flood Fringe Uses. A. All new principal structures shall have vehicular access at or above an elevation not more than two (2) feet below the Regulatory Flood Protection Elevation. If a variance to this requirement is granted, the Board of Adjustment shall specify limitations on the period of use or occupancy of the structure for times of flooding and only after determining that adequate flood warning time and local flood emergency response procedures exist. Dr a f t 11 / 2 0 / 2 0 1 7