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less than one square inch for every square foot of enclosed <br />area subject to flooding. There must be openings on at least <br />two sides of the structure and the bottom of all openings must <br />be no higher than one foot above the lowest adjacent grade <br />to the structure. Using human intervention to open a garage <br />door prior to flooding will not satisfy this requirement for <br />automatic openings. <br />c.Alternative elevation methods other than the use of fill may be <br />utilized to elevate a structure's lowest floor above the regulatory flood <br />protection elevation. These alternative methods may include the use <br />of stilts, pilings, parallel walls, etc., or above -grade, enclosed areas <br />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 <br />basement or lowest floor if: 1) the enclosed area is above -grade on at <br />least one side of the structure; 2) it is designed to internally flood and <br />is constructed with flood resistant materials; and 3) it is used solely <br />for parking of vehicles, building access or storage. The above -noted <br />alternative elevation methods are subject to the following additional <br />standards: <br />1. Design and certification. The structure's design and as - <br />built condition must be certified by a registered <br />professional engineer or architect as being in compliance <br />with the general design standards of the state building <br />code and, specifically, that all electrical, heating, <br />ventilation, plumbing and air conditioning equipment and <br />other service facilities must be at or above the regulatory <br />flood protection elevation or be designed to prevent flood <br />water from entering or accumulating within these <br />components during times of flooding. <br />2. Specific standards for above -grade, enclosed <br />areas. Above -grade, fully enclosed areas such as crawl <br />spaces or tuck under garages must be designed to <br />internally flood and the design plans must stipulate: <br />(i) A minimum area of openings in the walls <br />where internal flooding is to be used as a <br />flood proofing technique. There shall be a <br />minimum of two openings on at least two <br />