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a. The structure and attendant utilities located below the flood protection <br /> elevation are watertight and capable of resisting the effects of the base <br /> flood; <br /> b. The building design accounts for flood velocities, duration, rate of rise, <br /> hydrostatic and hydrodynamic forces, the effects of buoyancy, and the <br /> impact from debris and ice; <br /> c. 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 /> d. Levees, berms, floodwalls and similar works are not considered <br /> floodproofing for the purpose of this subsection. <br /> 4. Manufactured homes or travel trailers to be permanently installed on site shall be: <br /> a. Elevated to or above the flood protection elevation in accordance with <br /> Section 6 (2); and, <br /> b. Anchored to resist flotation, collapse, or lateral movement by being tied <br /> down in accordance with the rules and regulations for the Illinois Mobile <br /> Home Tie-Down Act issued pursuant to 77 Ill. Adm. Code § 870. <br /> 5. Travel trailers and recreational vehicles on a site for more than ninety (90) days per <br /> calendar year shall meet the elevation requirements of Section 6 (2 and 3) unless the <br /> following conditions are met: <br /> a. The vehicle must be either self-propelled or towable by a light duty truck of <br /> one (1)ton or less, as classified and licensed by the State of Illinois; <br /> b. The hitch must remain on the vehicle at all times; <br /> c. The vehicle must not be attached to external structures such as decks and <br /> porches; <br />