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C. 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 /> d. The interior height of the crawlspace measured from the interior <br /> grade of the crawl to the top of the foundation wall must not <br /> exceed four(4) feet at any point; <br /> e. 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 /> f. Portions of the building below the flood protection elevation <br /> must be constructed with materials resistant to flood damage; <br /> and, <br /> g. Utility systems within the crawlspace must be elevated above <br /> the flood protection elevation. <br /> C. Non-Residential Buildings may be structurally dry floodproofed (in lieu of elevation) <br /> provided a licensed professional engineer or architect certifies that: <br /> i. The structure and attendant utilities located below the flood protection <br /> elevation are watertight and capable of resisting the effects of the base flood; <br /> ii. The building design accounts for flood velocities, duration, rate of rise, <br /> hydrostatic and hydrodynamic forces,the effects of buoyancy, and the impact <br /> from debris and ice; <br /> iii. Floodproofing measures shall be incorporated into the building design and <br /> fully operable without human intervention and without an outside source of <br /> electricity; and, <br />