In all areas of special flood hazards where base flood elevation data have been provided as set forth in Section 1305.03(d)(2), the following provisions are required:
(a) Residential Construction. New construction and substantial improvement of any residential structure shall have the lowest floor, including basement, elevated to or above the base flood elevation.
(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 to the level of the base flood elevation; or together with attendant utility and sanitary facilities, shall:
(1) Be floodproofed so that below 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 buyoancy; and,
(3) Be certified by a registered professional engineer or architect that the design and methods of construction are in accordance with accepted standards of practice for meeting the standards of this subsection. Such certification shall be provided to the official as set forth in Section 1305.03(a)(3).
(c) Accessory Structures. An exemption to the evaluation or dry floodproofing standards may be granted for accessory structures (e.g., sheds, detached garages) containing 576 square feet or less in gross floor area. Such structures must meet the encroachment provisions of Section 1305.07
(a) and the following additional standards:
(1) They shall not be used for human habitation;
(2) They shall be designed to have low flood damage potential;
(3) They shall be constructed and placed on the building site so as to offer the minimum resistance to the flow of flood waters;
(4) They shall be firmly anchored to prevent flotation;
(5) Service facilities such as electrical and heating equipment shall be elevated or floodproofed.
(d) Manufactured Homes. The following standards shall apply to all new and substantially improved manufactured homes not subject to the manufactured home requirements of Ohio R.C. 3733.01.
(1) Manufactured homes shall be anchored in accordance with Section 1305.05(a)(2).
(Ord. 87-7. Passed 4-21-87.)
(2) All manufactured homes to be placed or substantially improved within A1-30, AH, and AE on the community's FIRM, be elevated on a permanent foundation such that the lowest floor of the manufactured home is at or above the base flood elevation; and be securely anchored to an adequately anchored foundation system in accordance with the provisions of this section. This paragraph applies to manufactured homes to be placed or substantially improved in an expansion to an existing manufactured home park or subdivision. This paragraph does not apply to manufactured homes to be placed or substantially improved in an existing manufactured home park or subdivision except where the repair, reconstruction, or improvement of the streets, utilities and pads equals, or exceeds fifty percent (50%) of the value of the streets, utilities and pads before the repair, reconstruction or improvement has commenced.
(Ord. 87-16. Passed 9-1-87.)
(e) Enclosures Below Base Flood Elevation. This provisions applies to all new and substantially improvement residential and nonresidential structures which are elevated to or above base flood elevations using pilings, columns, or posts or which contain a crawl space. These structures may enclose the area below base flood elevation provided that the enclosed areas are designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. Specific design criteria are found in the National Flood Insurance Program Rules and Regulations.
(Ord. 87-7. Passed 4-21-87.)