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A. All new construction and substantial improvements of nonresidential structures shall meet the following standards:

1. The lowest floor elevation (to include basement) of nonresidential structures shall be elevated or floodproofed to a minimum of one foot above the regulatory flood elevation; except that in Zone AO, the lowest floor (including basement) shall be as high as the depth number in feet on the effective FIRM above the highest adjacent grade, or two feet if no depth number is specified. In the alternative, nonresidential structures, including attendant utility and sanitary facilities, shall be completely floodproofed to or above the regulatory flood elevation so that any space below that level is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy;

2. Construction materials and utility equipment shall be resistant to floodwater damage;

3. Construction methods and practices shall minimize flood damage; and

4. The design and methods of all new construction and substantial improvements of nonresidential structures shall be certified by a registered professional engineer or architect that the standards of this section are satisfied.

B. Any nonresidential structure proposed to be floodproofed in accordance with this chapter shall be certified by a licensed civil engineer, structural engineer or architect, subsequent to construction of the proposed building or structure but prior to final approval for use or occupancy thereof and the elevation to which such floodproofing is effective shall be specified. (Ord. 3477 § 1, 2019; Ord. 3210, 2011; Ord. 3097, 2007).