05/10/1995 P&Z Packet - Laserfiche WebLink

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C. Whenever possible, structures shall be constructed with the longitudinal axis parallel to the direction of flood flow. D. So far as practicable, structures shall be placed approximately on the same flood flow lines as those of adjoining structures. Subdivision 4. Structural Flood Proofing Standards. Alternative elevation methods other than the use of fill may be utilized to elevate a commercial and industrial structure's lowest floor above the Regulatory Flood Protection Elevation. These alternative methods may include the use of stilts, pilings, parallel walls, etc., or above grade, enclosed areas such as crawl spaces or tuck under garages. The base or floor of an enclosed area shall be considered above grade and not a structure's basement or lowest floor if 1) the enclosed area is above grade on at least one side of the structure; 2) is designed to internally flood and is constructed with flood resistant materials; and 3) is used solely for parking of vehicles, building access or storage. The above noted alternative elevation methods are subject to the following additional standards: A. Design and Certification. The structure's design and as built condition must be certified by a registered professional engineer or architect as being in compliance with the general design standards of the State Building Code and, specifically, that all electrical heating, ventilation, plumbing and air conditioning equipment and other service facilities must be at or above the Regulatory Flood Protection Elevation or be designed to prevent flood water from entering or accumulating within these components during times of flooding. B. Specific Standards for Above Grade, Enclosed Areas. Above grade, fully enclosed areas such as crawl spaces or tuck under gar- ages must be designed to internally flood and the design plans must stipulate: 1. The minimum area of openings in the walls where internal flooding is to be used as a flood proofing technique. When openings are placed in a structure's walls to provide for entry of flood waters to equalize pressures, the bottom of all openings shall be no higher than one foot above grade. 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. 2. That the enclosed area will be constructed of flood resistant materials in accordance with the FP -3 or FP -4 classifications in Page 18