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   In all areas of special flood hazards where base flood elevation data have been provided as set forth in § 14-5-1-6 or in § 14-5-1-7(B)(2), the following standards are required:
   (A)   Residential Construction.  New construction and substantial improvement of any residential structure shall have the lowest floor (including basement) elevated to a minimum of one foot above the base flood elevation.  A registered professional engineer or land surveyor shall submit a certification to the Floodplain Administrator [i.e., the Administrator] that the standard of this division as proposed in § 14-1-8 is satisfied.
   (B)   Nonresidential Construction.  New construction and substantial improvement of any commercial, industrial or other nonresidential structure shall either have the lowest floor, including basement, elevated a minimum of one foot above the base flood elevation; or together with attendant utility and sanitary facilities, shall:
      (1)   Be floodproofed so that below one foot above the base flood level the structure is watertight with walls substantially impermeable to the passage of water;
      (2)   Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and
      (3)   Be certified by a professional engineer that the standards of this division (B) are satisfied.  Such certifications shall be provided to the official [i.e., the Administrator] as set forth in § 14-5-1-7(B)(3).
   (C)   Enclosures.  New construction and substantial improvements, with fully enclosed areas below the lowest floor that are subject to flooding, shall be designed automatically to equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters.  Designs for meeting this requirement must either be certified by a registered professional engineer, or meet or exceed the following minimum criteria:
      (1)   A minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be provided.
      (2)   The bottom of all openings shall be no higher than one foot above grade.
      (3)   Openings may be equipped with screens, louvers, valves, or other coverings or devices provided that they permit the automatic entry and exit of floodwaters.
   (D)   Manufactured Homes.
      (1)   Require that all manufactured homes to be placed within Zone A, shall be installed using methods and practices which minimize flood damage.  For the purpose of this requirement, manufactured homes must be elevated and anchored to resist flotation, collapse, or lateral movement. Methods of anchoring may include, but are not limited to, use of over-the-top or frame ties to ground anchors.  This requirement is in addition to applicable State and local anchoring requirements for resisting wind forces.
      (2)   All manufactured homes shall be in compliance with division (A) of this section.
      (3)   Require that all manufactured homes to be placed or substantially improved within Zones A1-30, and AH on the community's FIRM be elevated on a permanent foundation such that the lowest floor of the manufactured home is a minimum of one foot above the base flood elevation; and be securely anchored to an adequately anchored foundation system in accordance with the provision of division (1) above.
('74 Code, § 7-3-7B)  (Ord. 99-1981; Am. Ord. 77-1983; Am Ord. 66-1987)