(a) General Standards. In all areas of special flood hazards the following standards are required:
(1) Anchoring.
A. All new construction and substantial improvements shall be anchored to prevent flotation, collapse or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy.
B. All manufactured homes, if permitted now or in the future under the Zoning Code, and if not otherwise regulated by the Ohio Revised Code pertaining to manufactured home parks, shall be anchored to prevent flotation, collapse or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy. Methods of anchoring may include, but are not to be limited to, use of over-the-top or frame ties to ground anchors.
(2) Construction materials and methods.
A. All new construction and substantial improvements shall be constructed with materials resistant to flood damage.
B. All new construction and substantial improvements shall be constructed using methods and practices that minimize flood damage.
C. All new construction and substantial improvements shall be constructed with electrical, heating, ventilation, plumbing and air conditioning equipment and other service facilities that are designed and/or located so as to prevent water from entering and accumulating within the components during conditions of flooding.
(3) Utilities. The following standards apply to all water supply, sanitary sewerage and waste disposal systems not otherwise regulated by the Ohio Revised Code:
A. All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of flood waters into the systems;
B. New and replacement sanitary sewerage systems shall be designed to minimize or eliminate infiltration of flood waters into the systems and discharge from the systems into flood waters; and
C. Individual wastewater treatment systems shall be located to avoid impairment to them or contamination from them during flooding.
(4) Subdivision proposals.
A. All subdivision proposals, including manufactured home subdivisions, shall be consistent with the need to minimize flood damage;
B. All subdivision proposals, including manufactured home subdivisions, shall have public utilities and facilities such as sewer, gas, electrical and water systems located and constructed to minimize flood damage;
C. All subdivision proposals, including manufactured home subdivisions, shall have adequate drainage provided to reduce exposure to flood damage; and
D. All subdivision proposals, including manufactured home subdivisions, shall meet the specific standards of Section
(b) Specific Standards. In all areas of special flood hazards where base flood elevation data have been provided as set forth in Section 1331.04(b), Section 1331.05(d)(2), or Section 1331.07(b)(6), the following provisions are required:
(1) 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.
(2) 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:
A. Be flood-proofed so that the structure is watertight with walls substantially impermeable to the passage of water to the level of base flood elevation. In order to be eligible for lower flood insurance rates, the structure should be flood-proofed at least one foot above the base flood elevation;
B. Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and
C. 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
(3) Accessory Structures. An exemption to the elevation or dry flood- proofing standards may be granted for accessory structures such as sheds or detached garages, containing 576 square feet or less in gross floor area. Such structure shall meet the encroachment provisions of subsection(c) hereof and the following additional standards:
A. They shall not be used for human habitation;
B. They shall be designed to have low flood damage potential;
C. They shall be constructed and placed on the building site so as to offer the minimum resistance to the flow of flood waters;
D. They shall be firmly anchored to prevent flotation; and
E. Service facilities such as electrical and heating equipment shall be elevated or flood-proofed.
(4) Manufactured homes and recreational vehicles. To the extent that they are now or may in the future be permitted under the Zoning Code, the following standards shall apply to all new and substantially improved manufactured homes not subject to the manufactured homes requirements of Ohio R.C. 3733.01:
A. Manufactured homes shall be anchored in accordance with subsection (a)(1)B. hereof.
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.
These standards also apply to recreational vehicles that are either located on sites for one hundred eighty (180) days or more, or are not fully licensed and ready for highway use.
(5) Enclosures below the lowest floor. This provision applies 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 usable 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. Specific design criteria are found in the National Flood Insurance Program Rules and Regulations.
(6) Subdivisions and large developments. In all areas of special flood hazard where base flood elevation data have not been provided in accordance with Section 1331.04(b), or Section 1331.05(d)(2), the following standards apply to all subdivision proposals, including manufactured homes subdivisions, and other proposed developments containing at least fifty (50) lots or five (5) acres (whichever is less):
A. The applicant shall provide base flood elevation data performed in accordance with standard engineering practices,
B. If Section 1331.07(a) and (b).
(c) Floodways. A floodway is the channel of a river or other watercourse and the adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than one foot. The floodway is an extremely hazardous area due to the velocity of flood waters which carry debris, potential projectiles and erosion potential. The Flood Insurance Rate Map does not designate a floodway. However, floodways may be delineated in other available sources of flood information as specified in Section 1331.05(d)(2). The following provisions apply within all delineated floodway areas:
(1) Prohibit encroachments, including fill, new construction, substantial improvements, and other development unless a hydrologic and hydraulic analysis performed in accordance with standard engineering practices demonstrates that the proposed encroachment would not result in any increase in flood levels during the occurrence of the base flood discharge.
(2) If Section 1331.07(b).
(3) Any encroachment within the floodway that would result in an increase in base flood elevation can only be granted upon the prior approval by the Federal Emergency Management Agency. Such request must be submitted by the Zoning Administrator to the Federal Emergency Management Agency and must meet the requirements of the National Flood Insurance Program.
(Ord. 98-2L&R. Passed 2-17-98.)
(Ord. 98-2L&R. Passed 2-17-98.)