In all areas of special flood hazards where base flood elevation data have been provided as set forth in § 151.06, 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 buoyancy; and
(3) Be certified by a registered professional engineer or architect that the standards of this division (B) are satisfied. Such certification shall be provided to the official as set forth in § 151.40.
(C) Accessory structure. An exemption to the elevation or dry floodproofing standards may be granted for accessory structures such as sheds or detached garages, containing 576 square feet or less in gross floor area. Such structures shall meet the encroachment provisions of § 151.27 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; and
(5) Service facilities such as electrical and heating equipment shall be elevated or floodproofed.
(D) Manufactured homes.
(1) The following standards shall apply to all new and substantially improved manufactured homes not subject to the manufactured home requirements of R.C. §§ 4781.01 et seq.
(a) Manufactured homes shall be anchored in accordance with § 151.25(A)(2).
(b) Manufactured homes shall be elevated on a permanent foundation such that the lowest floor of the manufactured home is at or above the base flood elevation.
(2) These standards also apply to recreational vehicles that are either: located on sites for 180 days or more; or are not fully licensed and ready for highway use.
(E) Enclosures below the lowest floor. The following provisions apply to all new and substantially improved residential and nonresidential structures which are elevated to or above base flood elevation using pilings, columns or posts. Fully enclosed areas below the lowest floor that are used solely for parking of vehicles, building access or storage in an area other than a basement and which are subject to flooding shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of flood waters. Designs for meeting this requirement shall:
(1) Be certified by a registered professional engineer or architect; or
(2) Shall meet or exceed the following criteria:
(a) 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; and
(b) The bottom of all openings shall be no higher than one foot above grade. Openings may be equipped with screens, louvers, valves or other coverings or devices provided that they permit the automatic entry and exit of flood waters.
(F) Subdivisions and large developments. In all areas of special flood hazard where base flood elevation data have not been provided in accordance with §§ 151.06 or 151.42(B)(2), the following standards shall apply to all subdivision proposals, including manufactured home subdivisions, and other proposed developments containing at least 50 lots or five acres (whichever is less):
(1) The applicant shall provide base flood elevation data performed in accordance with standard engineering practices; and
(2) If division (F)(1) of this section is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of § 151.25 and this section.
(1997 Code, § 151.21) (Ord. 877-94, passed 8-22-1994)