In all areas of special flood hazard the following provisions are required for all new construction and substantial improvements:
(1) 
All new construction or substantial improvements shall be designed (or modified) and adequately anchored to prevent flotation, collapse or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy.
(2) 
All new construction or substantial improvements shall be constructed by methods and practices that minimize flood damage.
(3) 
All new construction or substantial improvements shall be constructed with materials resistant to flood damage.
(4) 
All new construction or 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 be eighteen inches (18") above the base flood elevation.
(5) 
All new and replacement water supply systems shall be designed to minimize or eliminate infiltration of floodwaters into the system.
(6) 
New and replacement sanitary sewage systems shall be designed to minimize or eliminate infiltration of floodwaters into the system and discharge from the system into floodwaters.
(7) 
On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding.
(Ordinance 857, art. 5, § A, 5-22-90; Ordinance 1658, § 1, 1-12-16; Ordinance 1877, 7-12-22)
In all areas of special flood hazard where base flood elevation data has been provided as set forth in section 50-28, section 50-62(8) or section 50-78(c), the following provisions are required:
(1) 
Residential construction.
New construction or substantial improvement of any residential structure shall have the lowest floor, including basement, machinery, and equipment, elevated a minimum of eighteen inches (18") above the base flood elevation. A registered professional engineer, architect or land surveyor shall submit a certification to the floodplain administrator that the standard of this subsection, as proposed in section 50-63(a)(1), is satisfied.
(2) 
Nonresidential construction.
New construction or substantial improvements of any commercial, industrial or other nonresidential structure shall either have the lowest floor, including basement, elevated a minimum of eighteen inches (18") above the base flood level or, together with attendant utility and sanitary facilities, be designed so that below the base flood 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 develop and/or review structural design, specifications and plans for the construction, and shall certify that the design and methods of construction are in accordance with accepted standards of practice as outlined in this article. A record of such certification which includes the specific elevation in relation to mean sea level, to which such structures are floodproofed shall be maintained by the floodplain administrator.
(3) 
Enclosures.
New construction and substantial improvements, with fully enclosed areas below the lowest floor that 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. 
A minimum of two openings on separate walls 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.
b. 
The bottom of all openings shall be no higher than one foot above grade.
c. 
Openings may be equipped with screens, louvers, valves or other coverings or devices provided that they permit the automatic entry and exit of floodwaters.
(4) 
Manufactured homes.
a. 
Require that all manufactured homes to be placed within zone A on a community's FIRM shall be installed using methods and practices which minimize flood damage. For the purpose of this requirement, manufactured homes must be elevated and anchored to resist flotation, collapse or lateral movement. Methods of anchoring may include, but are not limited to, use of over-the-top or frame ties to ground anchors. This requirement is in addition to applicable state and local anchoring requirements for resisting wind forces.
b. 
Require that manufactured homes that are placed or substantially improved within zones A1-30, AH and AE, V1-30, VE and/or V on the community's FIRM on sites: outside of a manufactured home park or subdivision; in a new manufactured home park or subdivision; in an expansion to an existing manufactured home park or subdivision; or in an existing manufactured home park or subdivision on which a manufactured home has incurred substantial damage as a result of a flood, be elevated on a permanent foundation such that the lowest floor of the manufactured home is elevated a minimum of eighteen inches (18") above the base flood elevation and is securely anchored to an adequately anchored foundation system to resist flotation, collapse and lateral movement.
c. 
Require that manufactured homes that are placed or substantially improved on sites in an existing manufactured home park or subdivision within zones A1-30, AH and AE on the community's FIRM that are not subject to the provisions of this subsection be elevated so that either:
1. 
The lowest floor of the manufactured home is a minimum of eighteen inches (18") above the base flood elevation; and
2. 
The manufactured home chassis is supported by reinforced piers or other foundation elements of at least equivalent strength that are no less than 36 inches in height above grade and is securely anchored to an adequately anchored foundation system to resist flotation, collapse and lateral movement.
(5) 
Recreational vehicles.
a. 
Require that recreational vehicles placed on sites within zones A1-30, AH and AE on the community's FIRM either:
1. 
Be on the site for fewer than 180 consecutive days;
2. 
Be fully licensed and ready for highway use; or
3. 
Meet the permit requirements of subsection (1) of this section and the elevation and anchoring requirements for manufactured homes in subsection (4)a of this section.
b. 
Require that recreational vehicles placed on sites within zones V1-30, V or VE on the community's FIRM either:
1. 
Be on the site for fewer than 180 consecutive days;
2. 
Be fully licensed and ready for highway use; or
3. 
Meet the requirements of subsections (1) and (4)c of this section.
c. 
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.
d. 
All recreational vehicles shall be capable of evacuation under its own power or if dependent on external power, the vehicle proposed for external power shall be in running condition.
e. 
Egress of recreational vehicles shall not be prevented by stored or fixed items such as stairs, porches, store rooms, etc.
f. 
Recreational vehicles stored on a homeowner's lot where the home is the primary residence are exempt from the 180-day permit regulations, subject to other ordinances or restrictions. These recreational vehicles must be unoccupied, not connected to neither water nor wastewater services, have a current motor vehicle license and inspection sticker and be capable of highway use.
(Ordinance 857, art. 5, § B, 5-22-90; Ordinance 1658, § 1, 1-12-16; Ordinance 1877, 7-12-22)
(a) 
All subdivision proposals including manufactured home parks and subdivisions shall be consistent with sections 50-46 through 50-48.
(b) 
All proposals for the development of subdivisions including manufactured home parks and subdivisions shall meet development permit requirements of sections 50-29 and 50-63, and the provisions of this division.
(c) 
Base flood elevation data shall be generated for subdivision proposals and other proposed developments including manufactured home parks and subdivisions which are greater than 50 lots or five acres, whichever is less, if not otherwise provided pursuant to sections 50-28 or 50-62(8).
(d) 
All subdivision proposals including manufactured home parks and subdivisions shall have adequate drainage to reduce exposure to flood hazards.
(e) 
All subdivision proposals including manufactured home parks and subdivisions shall have public utilities and facilities such as sewer, gas, electrical and water systems located and constructed to minimize or eliminate flood damage.
(Ordinance 857, art. 5, § C, 5-22-90; Ordinance 1658, § 1, 1-12-16; Ordinance 1877, 7-12-22)
Located within the areas of special flood hazard established in section 50-28, are areas designated as shallow flooding. 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 where velocity flow may be evident. Such flooding is characterized by ponding or sheet flow; therefore, the following provisions shall apply:
(1) 
All new construction and substantial improvements of residential structures shall have the lowest floor, including basement, elevated a minimum of eighteen inches (18") above base flood elevation or a minimum of eighteen inches (18") above the highest adjacent grade at least as high as the depth number specified in feet on the community's FIRM (at least 42 inches if no depth number is specified).
(2) 
All new construction and substantial improvements of nonresidential structures shall:
a. 
Have the lowest floor, including basement, elevated above the highest adjacent grade at least as high as the depth number specified in feet on the community's FIRM (at least 42 inches if no depth is specified); or
b. 
Together with attendant utility and sanitary facilities, be designed so that below the base flood 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.
(3) 
A registered professional engineer, architect or land surveyor shall submit a certification to the floodplain administrator that the standards of this section, as proposed in section 50-63(a)(1), are satisfied.
(4) 
Require within zones AH or AO adequate drainage paths around structures on slopes, to guide floodwaters around and away from proposed structures.
(Ordinance 857, art. 5, § D, 5-22-90; Ordinance 1658, § 1, 1-12-16; Ordinance 1877, 7-12-22)
Located within the areas of special flood hazard established in section 50-28 are areas designated as coastal high hazard areas (zones V1-30, VE and/or V). These areas have special flood hazards associated with high velocity waters from tidal surges and hurricane wave wash; therefore, in addition to meeting all provisions outlined in this article, the following provisions shall also apply:
(1) 
Obtain the elevation, in relation to mean sea level, of the bottom of the lowest structural member of the lowest floor (excluding pilings and columns) of all new and substantially improved structures, and whether or not such structures contain a basement. The floodplain administrator shall maintain a record of all such information.
(2) 
All new construction shall be located landward of the reach of mean high tide.
(3) 
All new construction and substantial improvements, including manufactured homes, shall be elevated on pilings and columns so that:
a. 
The bottom of the lowest horizontal structural member of the lowest floor, machinery, and equipment (excluding the pilings or columns) is elevated a minimum of eighteen inches (18") above the base flood level.
b. 
The pile or column foundation and structure attached thereto is anchored to resist flotation, collapse, and lateral movement due to the effects of wind and water loads acting simultaneously on all building components. Water loading values used shall be those associated with the base flood. Wind loading values used shall be those required by applicable state or local building standards.
c. 
A registered professional engineer or architect shall develop or review the structural design, specifications and plans for the construction and shall certify that the design and methods of construction to be used are in accordance with accepted standards of practice for meeting the provisions of subsection (3)a. and b. of this section.
(4) 
Provide that all new construction and substantial improvements have the space below the lowest floor either free of obstruction or constructed with non-supporting breakaway walls, open wood lattice work, or insect screening intended to collapse under wind and water loads without causing collapse, displacement, or other structural damage to the elevated portion of the building or supporting foundation system. For the purpose of this section, a breakaway wall shall have a design safe loading resistance of not less than ten and no more than 20 pounds per square foot. Use of breakaway walls which exceed a design safe loading resistance of 20 pounds per square foot (either by design or when so required by local or state codes) may be permitted only if a registered professional engineer or architect certifies that the designs proposed meet the following conditions:
a. 
Breakaway wall collapse shall result from a water load less than that which would occur during the base flood; and
b. 
The elevated portion of the building and supporting foundation system shall not be subject to collapse, displacement or other structural damage due to the effects of wind and water loads acting simultaneously on all building components (structural and nonstructural). Water loading values used shall be those associated with the base flood. Wind loading values used shall be those required by applicable state or local building standards.
(5) 
If breakaway walls are used, such enclosed space shall be usable solely for parking of vehicles, building access or storage. Such spaces shall not be used for human habitation.
(6) 
Prohibit the use of fill for structural support of buildings.
(7) 
Prohibit manmade alteration of sand dunes and mangrove stands which would increase potential flood damage.
(Ordinance 857, art. 5, § E, 5-22-90; Ordinance 1658, § 1, 1-12-16; Ordinance 1877, 7-12-22)