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B. be designed and certified by a registered professional engineer or architect to <br />automatically equalize hydrostatic flood forces on exterior walls by allowing for <br />the entry and exit of floodwaters; or <br />C. have a minimum of two openings on different walls having a total net area not <br />less than one square inch for every square foot of enclosed area, and the bottom of <br />all such openings being no higher than one foot above grade. The openings may <br />be equipped with screens, louvers, or other coverings or devices provided that <br />they permit the automatic entry and exit of floodwaters. <br />6. Manufactured homes shall be affixed to a permanent foundation and anchored <br />to prevent flotation, collapse or lateral movement of the structure resulting from <br />hydrodynamic and hydrostatic loads, including the effects of buoyancy. Methods of <br />anchoring may include, but are not limited to, use of over-the-top or frame ties to <br />ground anchors. <br />7. Repair or rehabilitation of historic sttuctures upon a detemunation that the <br />proposed repair or rehabilitation will not preclude the structure's continued <br />designation as a historic structure and is the minimum necessary to preserve the <br />historic character and design of the structure, shall be exempt from the development <br />standards of Section 1308.23(dl. <br />8. In AO Zones, new construction and substantaal improvement shall have adequate <br />drainage paths around structures on slopes to guide floodwaters around and away <br />from the structure. <br />(e) Nomesidential Structures <br />1. New construction and substantial improvement of any commercial, industrial or <br />other nonresidential structure shall meet the requirements of Section 1308.23(d~(1)- <br />(3) and (5) - (8). <br />2. New construction and substantial improvement of any commercial, industrial or <br />other non-residential structure shall either have the lowest floor, including basement, <br />elevated to or above the level of the flood protection elevation; or, together with <br />attendant utility and sanitary facilities, shall meet all of the following standards: <br />A. Be dry floodproofed so that the structure is watertight with walls substantially <br />impermeable to the passage of water to the level of the flood protection elevation; <br />B. Have structural components capable of resisting hydrostatic and <br />hydrodynamic loads and effects of buoyancy; and, <br />C. Be certified by a registered professional engineer or azchitect, through the use <br />of a Federal Emergency Management Agency Floodproofzng Certificate, that the <br />design and methods of construction are in accordance with Section <br />1308.23(e)(2)(A) and (B). <br />3.. In Zone AO azeas with no elevations specified, the structure shall have the lowest <br />floor, including basement, elevated at least two feet above the highest adjacent natural <br />grade. <br />(f) Accessory Structures <br />27 <br />