The following standards apply to new development, including new and substantially improved structures, in the areas of special flood hazard shown on the Flood Insurance Rate Map designated in §
95-5 of this chapter.
Additionally, the following elevation standards
apply to new and substantially improved residential structures located
in areas of special flood hazard:
A. Within Zones A1-A30, AE and AH and also Zone A if
base flood elevation data is available, new construction and substantial
improvements shall have the lowest floor (including basement) elevated
to or above two feet above the base flood level.
B. Within Zone A, when no base flood elevation data is
available, new and substantially improved structures shall have the
lowest floor (including basement) elevated at least three feet above
the highest adjacent grade.
C. Within Zone AO, new and substantially improved structures shall have the lowest floor (including basement) elevated above the highest adjacent grade at least as high as two feet above the depth number specified in feet on the community's Flood Insurance Rate Map enumerated in §
95-5 of this chapter (at least two feet if no depth number is specified).
D. Within Zones AH and AO, adequate drainage paths are
required to guide floodwaters around and away from proposed structures
on slopes.
Additionally, the following standards apply
to new and substantially improved commercial, industrial and other
nonresidential structures located in areas of special flood hazard:
A. Within Zones A1-A30, AE and AH and also Zone A, if
base flood elevation data is 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 basement or cellar,
elevated to or above two feet above the base flood elevation; or
(2) Be floodproofed so that the structure is watertight
below two feet above 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. Within Zone AO, new construction and substantial improvements
of nonresidential structures shall:
(1) Have the lowest floor (including basement) elevated
above the highest adjacent grade at least as high as two feet above
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 §
95-29A(2) of this chapter.
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 §
95-29A(2) of this chapter, 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 is
available, the lowest floor (including basement) shall be elevated
at least three feet above the highest adjacent grade.
Additionally, the following standards 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 §
95-30B,
C and
D of this chapter.
(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 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.
C. Within Zone A, when no base flood elevation data is
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 grade and
are securely anchored to an adequately anchored foundation system
to resist flotation, collapse or lateral movement.
D. 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 §
95-5 of this chapter (at least two feet if no depth number is specified).