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hydrodynamic and hydrostatic loads, including the effects of <br /> buoyancy; <br /> ii. Any enclosed area below the flood protection elevation shall <br /> have openings that equalize hydrostatic pressures by allowing <br /> for the automatic entry and exit of floodwaters. A minimum of <br /> one opening on each wall having a total net area of not less <br /> than one (1) square inch per one (1) square foot of enclosed <br /> area. The openings shall be no more than one (1) foot above <br /> final grade; <br /> iii. The interior grade of the crawlspace below the flood protection <br /> elevation must not be more than two (2) feet below the lowest <br /> adjacent exterior grade; <br /> iv. The interior height of the crawlspace measured from the <br /> interior grade of the crawl to the top of the foundation wall <br /> must not exceed four(4) feet at any point; <br /> V. An adequate drainage system must be installed to remove <br /> floodwaters from the interior area of the crawlspace within a <br /> reasonable period of time after a flood event; <br /> vi. Portions of the building below the flood protection elevation <br /> must be constructed with materials resistant to flood damage; <br /> and, <br /> vii. Utility systems within the crawlspace must be elevated above <br /> the flood protection elevation. <br /> 3. Existing Non-Residential Buildings may be structurally dry floodproofed (in lieu of <br /> elevation)provided a licensed professional engineer or architect certifies that: <br />