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(i) The structure is watertight below the base flood elevation <br /> plus the required freeboard. <br /> (ii) The walls are substantially impermeable to the passage of <br /> water. <br /> (iii) The structural components are capable of resisting <br /> hydrostatic and hydrodynamic loads and the effects of <br /> buoyancy. <br /> (C) Within Zone AH, new construction, improvements to repetitive <br /> loss structures, and substantial improvement shall be required to <br /> provide adequate drainage paths around structures on slopes to <br /> guide floodwaters around and away from proposed structures. <br /> (D) Fully enclosed areas below the lowest floor that are useable solely <br /> for parking of vehicles, building access, or storage in an area other <br /> than a basement and which are subject to flooding, shall be <br /> designed to automatically equalize hydrostatic flood forces on <br /> exterior walls by allowing for the entry and exit of floodwaters. <br /> Designs for meeting this requirement must either be certified by a <br /> currently licensed professional engineer or architect or meet or <br /> exceed the following criteria: A minimum of two openings having <br /> a total net area of not less than one square inch for every square <br /> foot of enclosed area subject to flooding shall be provided. Each <br /> opening must be on different sides of the enclosed area. The <br /> bottom of all openings shall be no higher than one foot above <br /> grade. Openings may be equipped with screens, louvers, valves, or <br /> other coverings or devices provided that they permit the automatic <br /> entry and exit of floodwaters. <br /> (2) Within Zone AO: <br /> (A) For residential new construction, improvements to repetitive loss <br /> structures, and substantial improvements, the lowest floor shall be <br /> elevated above the highest adjacent grade at least one foot above <br /> the depth number specified in feet on the FIRM, or at least three <br /> feet if no depth number is specified. <br /> (B) For nonresidential new construction, improvements to repetitive <br /> loss structures, and substantial improvements, the lowest floor <br /> shall be elevated or completely floodproofed above the highest <br /> adjacent grade at least one foot above the depth number specified <br /> in feet on the FIRM, or at least three feet if no depth number is <br /> specified. If the lowest floor is to be completely floodproofed, then <br /> a currently licensed professional engineer or architect in the State <br /> of Hawai`i shall develop and /or review structural design, <br /> specifications and plans for construction and shall certify that the <br /> design and methods of construction are in accordance with <br /> accepted standards of practice for the structure together with <br /> attendant utility and sanitary facilities such that: <br /> (i) The structure is watertight below the referenced flood <br /> elevation. <br /> 5 <br />