2009.10.05 ORD 2009-434 - Laserfiche WebLink

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(1) 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. (2) Specific Standards for Above -grade, Enclosed Areas - Above -grade, fully enclosed areas such as crawl spaces or tuck under garages must be designed to internally flood and the design plans must stipulate: (i) A 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 (ii) That the enclosed area will 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. d. Structures shall be constructed to prevent flotation which may result in damage to other structures and/or restrictions of bridge openings or other narrow sections of watercourses. e. Public services such as gas, electrical, sewer and water supply systems shall be floodproofed in accordance with the State building code, unless situated above the regulatory flood protection elevation. f. Parking lots may be constructed at elevations lower than the regulatory flood protection elevation, provided that for the parking lots to be used by employees or the general public, a flood warning system must be in place and operational. The flood warning system must provide adequate time for evacuation if the area would be inundated to a depth and velocity such that when multiplying the depth (in feet) times the velocity (in feet per second) the product number exceeds 4 upon occurrence of the regional flood. g. Railroad tracks, roads, and bridges shall be elevated to, or above, the regulatory flood protection elevation where failure or interruption of the facility would 23