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10/16/23, 10:01 AM Print Preview <br />https://lakeelmo.municipalcodeonline.com/book/print?type=ordinances&name=TITLE_100_FLOODPLAIN_MANAGEMENT 7/19 <br />(1)Alternative elevation methods other than the use of fill may be utilized to elevate a <br />structure's lowest floor above the regulatory flood protection elevation. These alternative <br />methods may include the use of stilts, pilings, parallel walls, etc., or above-grade, <br />enclosed areas such as crawl spaces or tuck under garages. The base or floor of an <br />enclosed area shall be considered above-grade and not a structure's basement or lowest <br />floor if: <br />a.The enclosed area is above-grade on at least one side of the structure; <br />b.It is designed to internally flood and is constructed with flood-resistant materials; <br />and <br />c.It is used solely for parking of vehicles, building access or storage. <br />The above-noted alternative elevation methods are subject to the following <br />additional standards: <br />1.Design and certification. The structure's design and as-built condition <br />must be certified by a registered professional engineer or architect as <br />being in compliance with the general design standards of the state <br />building code and, specifically, that all electrical, heating, ventilation, <br />plumbing and air conditioning equipment and other service facilities must <br />be at or above the regulatory flood protection elevation or be designed to <br />prevent floodwater from entering or accumulating within these <br />components during times of flooding. <br />2.Specific standards for above-grade, enclosed areas. Above-grade, fully <br />enclosed areas such as crawl spaces or tuck under garages must be <br />designed to internally flood and the design plans must stipulate: "A <br />minimum area of "automatic" openings in the walls where internal flooding <br />is to be used as a floodproofing technique. There shall be a minimum of <br />two openings on at least two sides of the structure and the bottom of all <br />openings shall be no higher than one foot above-grade. The automatic <br />openings shall have a minimum net area of not less than one square inch <br />for every square foot of enclosed area subject to flooding unless a <br />registered professional engineer or architect certifies that a smaller net <br />area would suffice. The automatic openings may be equipped with <br />screens, louvers, valves, or other coverings or devices, provided that they <br />permit the automatic entry and exit of floodwaters without any form of <br />human intervention"; and "That the enclosed area will be designed of <br />flood resistant materials in accordance with the FP-3 or FP-4 <br />classifications in the state building code and shall be used solely for <br />building access, parking of vehicles or storage." <br />(2)Basements, as defined in LEC 1.08, shall be subject to the following: <br />a.Residential basement construction shall not be allowed below the regulatory flood <br />protection elevation. <br />b.Nonresidential basements may be allowed below the regulatory flood protection <br />elevation provided the basement is structurally dry floodproofed in accordance <br />with subsection (d)(3) of this section. <br />(3)All areas of nonresidential structures, including basements, to be placed below the <br />regulatory flood protection elevation shall be floodproofed in accordance with the <br />structurally dry floodproofing classifications in the state building code. Structurally dry