1353.06 PROVISIONS FOR FLOOD HAZARD REDUCTION.

    (a)    General Standards. In all special flood hazard areas, the following standards are required:

      (1)   Anchoring. 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. Manufactured Homes shall be affixed to a permanent foundation and anchored to prevent floatation, 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 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 or accumulating within the components during conditions of flooding.

      (3)    Utilities.

         A.    All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of floodwaters into the systems;

         B.    New and replacement sanitary sewerage systems shall be designed to minimize or eliminate infiltration of floodwaters into the systems and discharge from the systems into floodwaters; and

         C.    On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.

      (4)    Subdivision proposals.

         A.    All subdivision proposals shall be consistent with the need to minimize flood damage;

         B.    All subdivision proposals 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 shall have adequate drainage provided to reduce exposure to flood damage; and,

         D.    In all areas of special flood hazard where base flood elevation data are not available, the applicant shall provide a hydrologic and hydraulic engineering analysis that generates base flood elevations for all subdivision proposals and other proposed developments containing at least fifty lots or five acres, whichever is less.

      (5)    Fill Prohibited. The deposit of fill, including sand, gravel or other materials of any composition, is prohibited.
(Ord. 2005-22. Passed 4-11-05.)

   (b)    Specific Standards. In all special flood hazard areas where base flood elevation data have been provided as set forth in Section 1353.03(b) or Section 1353.04(d)(3), and in all areas that constitute flood protection elevations as determined by the Flood Damage Prevention Administrator, the following provisions are required:

      (1)    Residential construction. New construction and substantial improvement of any residential structures, including manufactured homes, shall have the lowest floor, including basement, elevated to no less than eighteen (18) inches 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 no less than eighteen (18) inches above the level of the base flood elevation; or, together with attendant utility and sanitary facilities, shall:

         A.    Be floodproofed so that below the base flood level the structure is watertight with walls substantially impermeable to the passage of water;

         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 1353.04(a)(3).

      (3)    Accessory structures. New construction and substantial improvement of any accessory structures shall have the lowest floor, including basement, elevated to no less than eighteen (18) inches above the base flood elevation An exemption to the elevation 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 shall meet the encroachment provisions of Section 1353.07(a) and the following additional standards:

         A.    They shall not be used for human habitation;

         B.    They shall be constructed of flood resistant materials:

          C.    They shall be designed to have low flood damage potential;

          D.    They shall be constructed and placed on the building site so as to offer the minimum resistance to the flow of floodwaters;

          E.    They shall be firmly anchored to prevent flotation; and

         F.    Service facilities, such as electrical and heating equipment, shall be elevated or floodproofed to or above the level of the flood protection elevation; and, they shall meet the opening requirements of Section 1353.06(b)(4).

      (4)    Enclosures below the lowest floor base flood elevation. The following standards apply to all new and substantially improved residential and nonresidential nonbasement structures, including manufactured homes, which are elevated to or above flood protection elevation using pilings, columns or posts or solid foundation perimeter walls with openings sufficient to allow unimpeded movement of flood waters. Fully enclosed areas below the lowest floor that are useable 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 floodwaters. Designs for meeting this requirement shall:

         A.    Be certified by a registered professional engineer or architect; or,

         B.    Shall meet or exceed the following 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; and,

            3.    Openings may be equipped with screens, louvers or other coverings or devices provided that they permit the automatic entry and exit of floodwaters.

          C.    Any enclosure which meets these criteria shall be considered as having met the requirements of subsection (a)(l) hereof.

      (5)    Recreational vehicles. Recreational vehicles must meet at least one of the following standards:

         A.    They shall not be located on sites in special flood hazard areas for more than 180 days, or

         B.    They must be fully licensed and ready for highway use, or

         C.    They must meet all standards of Section 1353.06.

            (Ord. 2010-45. Passed 9-13-10.)