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and with structural components having the capability of resisting hydrostatic and <br /> hydrodynamic loads and effects of buoyancy. A registered professional engineer or <br /> architect shall develop and/or review structural design, specifications, and plans for <br /> the construction, and shall certify that the design and methods of construction are <br /> in accordance with accepted standards of practice as outlined in this subsection. A <br /> record of such certification which includes the specific elevation (in relation to mean <br /> sea level) to which such structures are floodproofed shall be maintained by the <br /> floodplain administrator. <br /> (3) Enclosures. New construction and substantial improvements, with fully <br /> enclosed areas below the lowest floor that are usable solely for parking of vehicles, <br /> building access or storage in an area other than a basement and which are subject <br /> to flooding shall be designed to automatically equalize hydrostatic flood forces on <br /> exterior walls by allowing for the entry and exit of floodwaters. Designs for meeting <br /> this requirement must either be certified by a registered professional engineer or <br /> architect or meet or exceed the following minimum criteria: <br /> a. A minimum of two openings on separate walls having a total net area of <br /> not less than one square inch for every square foot of enclosed area <br /> subject to flooding shall be provided. <br /> b. The bottom of all openings shall be no higher than one foot above grade. <br /> c. Openings may be equipped with screens, louvers, valves, or other <br /> coverings or devices provided that they permit the automatic entry and exit <br /> of floodwaters. <br /> (4) Manufactured homes. <br /> a. Require that all manufactured homes to be placed within zone A on a <br /> community's FHBM or FIRM shall be installed using methods and practices <br /> which minimize flood damage. For the purposes of this requirement, <br /> manufactured homes must be elevated and anchored to resist flotation, <br /> collapse, or lateral movement. Methods of anchoring may include, but are <br /> not limited to, use of over-the-top or frame ties to ground anchors. This <br /> requirement is in addition to applicable state and local anchoring <br /> requirements for resisting wind forces. <br /> b. Require that manufactured homes that are placed or substantially <br /> improved within zones A1-30, AH, and AE on the community's FIRM on <br /> sites (i) outside of a manufactured home park or subdivision, (ii) in a <br /> new manufactured home park or subdivision, (iii) in an expansion to an <br /> existing manufactured home park or subdivision, or (iv) in an existing <br /> manufactured home park or subdivision on which a manufactured home <br /> has incurred "substantial damage" as a result of a flood, be elevated on <br /> a permanent foundation such that the lowest floor of the manufactured <br /> home, as well as any electrical, heating, ventilation, plumbing, and air <br /> conditioning equipment and other service facilities affixed thereto, is <br /> 14 <br />