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(1) . Walls of any enclosure below <br /> the elevated floor shall be designed to automatically <br /> equalize hydrostatic flood forces on the walls by allowing <br /> for the entry and exit of flood waters, through providing <br /> a minimum of two openings, in addition to doorways and <br /> windows, having a total area of one (1) square foot for <br /> every two (2) square feet of enclosed floor area subject <br /> to flooding. The bottom of all such openings shall be no <br /> higher than one (1) foot above the enclosed area's floor. <br /> (2) . Any enclosure below the <br /> elevated floor is used for nonresidential purposes and <br /> building access. <br /> (b) . The foundation and supporting <br /> members shall be anchored and aligned in relation to flood <br /> flows and adjoining structures so as to minimize exposure <br /> to known hydrodynamic forces such as current, waves, ice, <br /> and floating debris. <br /> (c) . All areas below the Flood Protection <br /> Grade shall be constructed of materials resistant to flood <br /> damage. The lowest floor and all electrical , heating, <br /> ventilating, plumbing, and air conditioning equipment and <br /> utility meters shall be located at or above the Flood <br /> Protection Grade. Water and sewer pipes, electrical and <br /> telephone lines, submersible pumps, and other waterproofed <br /> service facilities may be located below the Flood <br /> Protection Grade. <br /> 3. The manufactured home, mobile home, <br /> recreation vehicle, or trailer to be installed or <br /> substantially improved on a site for more than 180 days <br /> must meet one of the following anchoring requirements: <br /> (a) . The manufactured home or mobile home <br /> shall be elevated on a permanent foundation such that the <br /> lowest floor shall be at or above the Flood Protection <br /> Grade and securely anchored to an adequately anchored <br /> foundation system to resist flotation, collapse, and <br /> lateral movement. This requirement applies to all <br /> manufactured homes or mobile homes to be placed on a site; <br /> (1) . Outside a manufactured home or <br /> mobile home park or subdivision; <br /> (2) . In a new manufactured home or <br /> mobile home park or subdivision; <br /> (3) . In an expansion to an <br /> existing manufactured home or mobile home park or <br /> subdivision; or <br /> (4) . In an existing manufactured <br /> home or mobile home park or subdivision on which a <br /> manufactured home or mobile home has incurred "substantial <br /> damage" as a result of a flood. <br /> (b) . The manufactured home or mobile home <br /> shall be elevated so that the lowest floor of the <br /> manufactured home or mobile home chassis is supported by <br /> reinforced piers or other foundation elements that are no <br /> less than 36 inches in height above grade and be securely <br /> anchored to an adequately anchored foundation system to <br /> resist f l ntat i nn_ rnl l ar,ma_ arâ–ºri l cetera l mnnomon+ T),i m <br />