(A) No permit for development shall be granted for new construction, substantial improvements and other development(s), including the placement of manufactured homes within all numbered and unnumbered Zone A, unless the conditions of this section are satisfied.
(B) All areas identified as unnumbered Zone A on the FIRM are subject to inundation of the base flood; however, the water surface elevation was not provided. The unnumbered Zone A shall be subject to all development provisions of this chapter. If Flood Insurance Study data is not available, the community shall utilize any base flood elevation or floodplain data currently available from federal, state or other sources.
(C) Until a floodway has been designated, no development or substantial improvement may be permitted within special flood hazard areas unless the applicant has demonstrated that the proposed development or substantial improvement, when combined with all other existing and reasonably anticipated developments or substantial improvements, will not increase the water surface elevation of the base flood more than one foot at any location as shown on the Flood Insurance Study.
(D) New construction, subdivision proposals, substantial improvements, prefabricated buildings and other developments shall require:
(1) Design or anchorage to prevent flotation, collapse or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy;
(2) New or replacement water supply systems and/or sanitary sewage systems be designed to minimize or eliminate infiltration of flood waters into the systems and discharges from the systems into floodwaters, and on-site waste disposal systems be located so as to avoid impairment or contamination;
(3) Construction with materials resistant to flood damage, utilizing methods and practices that minimize flood damages, and 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; and
(4) All utility and sanitary facilities be elevated or floodproofed up to the regulatory flood protection elevation.
(E) (1) The storage or processing of materials that are, in times of flooding, buoyant, flammable, explosive or could be injurious to human, animal or plant life is prohibited.
(2) The storage of other material or equipment may be allowed if not subject to major damage by floods and firmly anchored to prevent flotation, or if readily removable from the area within the time available after flood warning.
(F) Subdivision proposals and other proposed new development are required to assure that:
(1) All such proposals are consistent with the need to minimize flood damage;
(2) All public utilities and facilities, such as sewer, gas, electrical and water systems, are located, elevated and constructed to minimize or eliminate flood damage;
(3) Adequate drainage is provided so as to reduce exposure to flood hazards; and
(4) Proposals for development of five acres or 50 lots, whichever is lesser, include within such proposals the base flood elevation.
(G) Require new construction or substantial improvements of residential structures to have the lowest floor, including basement, elevated to or above one foot above the base flood elevation.
(H) Require new construction or substantial improvements of nonresidential structures to have the lowest floor, including basement, elevated to or above one foot above the base flood elevation or, together with attendant utility and sanitary facilities, to be floodproofed so that below that level the structure is watertight, with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. A registered professional engineer or architect shall certify that the standards of this division (H) are satisfied. Such certification shall be provided to the Land Use Administrator as set forth in § 151.26(B)(7) of this chapter.
(I) Require for all new construction and substantial improvements that fully enclosed areas below the lowest floor that are usable solely for the 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 must either be certified by a registered professional engineer or architect or meet or exceed the following minimum criteria: 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. The bottom of all openings shall be not 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 floodwaters.
(J) Within any floodplain, the construction or placement of new or substantially improved manufactured homes shall be prohibited.
(K) Within AH Zones, adequate drainage paths around structures on slopes shall be required to guide floodwaters around and away from proposed structures.
(L) (1) Recreational vehicles placed on sites within the special flood hazard areas on the community’s official map shall either:
(a) Be on the site for fewer than 180 consecutive days;
(b) Be fully licensed and ready for highway use; or
(c) Meet the permit requirements for manufactured homes established in division (J) above.
(2) A recreational vehicle is READY FOR HIGHWAY USE if it is on its wheels or jacking system, is attached to the site only by quick-disconnect-type utilities and security devices and has no permanently attached additions.
(M) Located within the areas of special flood hazard established in § 151.06 of this chapter are areas designated as AO Zones. These areas have special flood hazards associated with base flood depths of one to three feet where a clearly defined channel does not exist and where the path of flooding is unpredictable and indeterminate; therefore, the following provisions apply within AO Zones.
(1) All new construction and substantial improvements of residential structures shall have the lowest floor (including basement) elevated above the highest adjacent grade at least as high as one foot above the depth number specified in feet on the community’s FIRM (at least two feet if no depth number is specified).
(2) All new construction and substantial improvements of nonresidential structures shall:
(a) Have the lowest floor elevated above the highest adjacent grade at least as high as one foot above the depth number specified in feet on the community’s FIRM (at least two feet if no depth number is specified); or
(b) Together with attendant utility and sanitary facilities, be completely floodproofed to or above that level so that any space below that level is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. Such certification shall be provided to the Official as set forth in § 151.26(B)(7) of this chapter.
(3) Adequate drainage paths around structures on slopes shall be required in order to guide floodwaters around and away from proposed structures.
(Ord. 359, passed 7-30-2007; Ord. 473, passed 3-25-2024)