The following standards apply to new and substantially improved commercial, industrial and other nonresidential structures, in addition to the requirements in §
63-15A, Subdivision proposals, §
63-15B, Encroachments, and §
63-16, Standards for all structures:
A. Within Zones A1-A30, AE and AH, and also Zone A if
base flood elevation data are available, new construction and substantial
improvements of any nonresidential structure, together with attendant
utility and sanitary facilities, shall either:
(1) Have the lowest floor, including the basement or cellar,
elevated to or above the base flood elevation; or
(2) Be floodproofed so that the structure is watertight
below the base flood level with walls substantially impermeable to
the passage of water. All structural components located below the
base flood level must be capable of resisting hydrostatic and hydrodynamic
loads and the effects of buoyancy.
B. With Zone AO, new construction and substantial improvements
of nonresidential structures shall:
(1) Have the lowest floor (including the 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 two feet
if no depth number is specified]; or
(2) Together with attendant utility and sanitary facilities, be completely floodproofed to that level to meet the floodproofing standard specified in Subsection
A(2).
C. If the structure is to be floodproofed, a licensed professional engineer or architect shall develop and/or review structural design, specifications and plans for construction. A floodproofing certificate or other certification shall be provided to the local administrator that certifies that the design and methods of construction are in accordance with accepted standards of practice for meeting the provisions of §
63-18A(2), including the specific elevation (in relation to mean sea level) to which the structure is to be floodproofed.
D. Within Zones AH and AO, adequate drainage paths are
required to guide floodwaters around and away from proposed structures
on slopes.
E. Within Zone A, when no base flood elevation data are
available, the lowest floor (including the basement) shall be elevated
at least three feet above the highest adjacent grade.
The following standards in addition to the standards in §
63-15, General standards, and §
63-16, Standards for all structures, apply, as indicated, in areas of special flood hazard to manufactured homes and to recreational vehicles which are located in areas of special flood hazard:
A. Recreational vehicles.
(1) Recreational vehicles placed on sites within Zones
A1-A30, AE and AH shall either:
(a)
Be on site fewer than 180 consecutive days;
(b)
Be fully licensed and ready for highway use;
or
(c)
Meet the requirements for manufactured homes in Subsections
B,
D, and
E.
(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.
B. A manufactured home that is placed or substantially
improved in Zones A1-A30, AE and AH that is on a site either outside
of an existing manufactured home park or subdivision as herein defined;
in a new manufactured home park or subdivision as herein defined;
in an expansion to an existing manufactured home park or subdivision
as herein defined; or in an existing manufactured home park or subdivision
as herein defined on which a manufactured home has incurred substantial
damage as the result of a flood shall be elevated on a permanent foundation
such that the lowest floor is elevated to or above the base flood
elevation and is securely anchored to an adequately anchored foundation
system to resist flotation, collapse and lateral movement. Elevation
on piers consisting of dry stacked blocks is prohibited. Methods of
anchoring may include, but are not limited to, use of over-the-top
or frame ties to ground anchors.
C. A manufactured home to be placed or substantially
improved in Zone A1-A30, AE and AH in an existing manufactured home
park or subdivision that is not to be placed on a site on which a
manufactured home has incurred substantial damage shall be:
(1) Elevated in a manner such as required in Subsection
B; or
(2) Elevated such that 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
the lowest adjacent grade and are securely anchored to an adequately
anchored foundation system to resist flotation, collapse or lateral
movement. Elevation on piers consisting of dry stacked blocks is prohibited.
D. Within Zone A, when no base flood elevation data are
available, new and substantially improved manufactured homes shall
be elevated such that 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 the lowest
adjacent grade and are securely anchored to an adequately anchored
foundation system to resist flotation, collapse or lateral movement.
Elevation on piers consisting of dry stacked blocks is prohibited.
E. Within Zone AO, the floor shall be elevated above the highest adjacent grade at least as high as the depth number specified on the Flood Insurance Rate Map enumerated in §
63-6 [at least two feet if no depth number is specified]. Elevation on piers consisting of dry stacked blocks is prohibited.