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Ordinance 04- :J.. 1/1 Page 2 of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. A registered professional engineer shall develop and review structural design, specifications, and plans for the construction, and shall certify that the design and methods of construction are in accordance with accepted standards of practice as outlined in this subsection. A record of such certification which includes the specifiC elevation (in relation to mean sea level) to which such structures are flood proofed shall be maintained by the floodplain administrator. (3) Enclosures. New construction and substantial improvements, with fully enclosed areas below the lowest floor that are subject to flooding shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwater. Designs for meeting requirement must either be certified by a registered professional engineer or meet or exceed the following minimum criteria: a. A minimum of two openings which have a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be provided. b. The bottom of all openings shall be no higher than one foot above grade. c. Openings may be equipped with screens, louvers, valves, or other coverings or devices provided that they permit the automatic entry and exit of floodwaters. (4) Manufactured homes. a. All manufactured homes shall be anchored to resist flotation, collapse, or lateral movement by providing over-the-top and frame ties to ground anchors. This requirement is in addition to applicable state and local anchoring requirements for resisting wind. Specific requirements shall be: 1. Over-the-top ties at each of the four comers of the manufactured home, with two additional ties per side at intermediate locations and manufactured homes less than 50 feet long requiring one additional tie per side; 2. Frame ties at each comer of the home with five additional ties per side at intermediate points and mobile homes less than 50 feet long requiring four additional ties per side; 3. All components of the anchoring system capable of carrying a force of 4,800 pounds; 4. Any additions to the manufactured home similarly anchored. 5. Alternate means of anchorage such as those presented in the September 1985 FEMA Manual "Manufactured Home Installation in Flood Hazard Area" may be used if approved by the floodplain administrator.