Located within areas of special flood hazard established in section 10-4-4 of this chapter are coastal high hazard areas, designated as zones V1-30, VE and/or V. These areas have special flood hazards associated with high velocity waters from surges and, therefore, in addition to meeting all provisions in this chapter, the following provisions shall also apply:
A. Design And Method Of Construction:
1. All new construction and substantial improvements in zones V1-30 and VE (V if base flood elevation data is available) on the community's FIRM shall be elevated on pilings and columns so that:
a. The bottom of the lowest horizontal structural member of the lowest floor (excluding the pilings or columns) is elevated a minimum of one foot (1') above the base flood level; and
b. The pile or column foundation and structure attached thereto is anchored to resist flotation, collapse, and lateral movement resulting from wind and water loads acting simultaneously on all building components. Wind and water loading values shall each have a one percent (1%) chance of being equaled or exceeded in any given year (a 1 in 100 chance, based on the 100-year mean recurrence interval as defined in chapter 1 of this title).
2. A registered professional engineer or architect shall develop or review the structural design, specifications and plans for construction, and shall certify the design and methods of construction to be used are in accordance with accepted standards of practice for meeting provisions of subsection A1 of this section.
B. Record Of Elevation: 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 each new and substantially improved structure in zones V1-30, VE, and V on the community's FIRM, and ascertain whether or not each structure contains a basement. The city administrator shall maintain a record of all such information.
C. Location: All new construction within zones V1-30, VE, and V on the community's FIRM shall be located landward of the reach of mean high tide.
D. Breakaway Walls:
1. All new construction and substantial improvements within zones V1-30, VE, and V on the community's FIRM shall have the space below the lowest floor either free of obstructions 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 purposes of this section, a breakaway wall shall have a design safe loading resistance of not less than ten (10) and no more than twenty (20) pounds per square foot. Use of breakaway walls which exceed a design safe loading resistance of twenty (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 the design as proposed meets the following conditions:
a. Breakaway wall collapse shall result from 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). Maximum wind and water loading values to be used in this determination shall each have a one percent (1%) chance of being equaled or exceeded in any given year (a 1 in 100 chance, based on the 100-year mean recurrence interval as defined in chapter 1 of this title).
2. If breakaway walls are utilized, space enclosed or partially enclosed by such walls shall be useable solely for parking of vehicles, building access, or storage. Such space shall not be used for human habitation.
E. Fill Prohibited: Use of fill for structural support of buildings within zones V1-30, VE, and V on the community's FIRM shall be prohibited.
F. Alteration Of Sand Dunes Prohibited: Manmade alteration of sand dunes within zones V1-30, VE, and V on the community's FIRM which would increase potential flood damage shall be prohibited.
G. Manufactured Homes: All manufactured homes to be placed or substantially improved within zones V1-30, V, and VE on the community's FIRM on sites located:
1. Outside of a manufactured home park or subdivision;
2. In a new manufactured home park or subdivision;
3. In an expansion to an existing manufactured home park or subdivision; or
4. In an existing manufactured home park or subdivision on which a manufactured home has incurred "substantial damage" as the result of a flood; shall meet standards of subsections A through F of this section. Manufactured homes placed or substantially improved on other sites in an existing manufactured home park or subdivision within zones V1-30, V, and VE on the FIRM shall meet requirements of subsection 10-3-4 of this title.
H. Recreational Vehicles: RVs placed on sites within zones V1-30, V, and VE on the community's FIRM are required to:
1. Be on the site for fewer than one hundred eighty (180) consecutive days; and
2. Be fully licensed and ready for highway use, on its wheels or jacking system, be attached to the site only by quick disconnect type utilities and security devices, and have no permanently attached additions; or
3. Meet the requirements of subsection 10-4-7A2 of this chapter, and subsections A through F of this section. (Ord. 847, 8-17-2009; amd. Ord. 1016, 6-5-2023)