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 § 64-6, Basis for establishing areas of special flood hazard.
A.
Subdivision proposals. The following standards apply
to all new subdivision proposals and other proposed development in
areas of special flood hazard (including proposals for manufactured
home and recreational vehicle parks and subdivisions):
(1)
Proposals shall be consistent with the need to minimize
flood damage;
(2)
Public utilities and facilities such as sewer, gas,
electrical and water systems shall be located and constructed so as
to minimize flood damage; and
(3)
Adequate drainage shall be provided to reduce exposure
to flood damage.
B.
Encroachments.
(1)
Within Zones A1-A30 and AE, on streams without a regulatory
floodway, no new construction, substantial improvements or other development
(including fill) shall be permitted unless:
(a)
The applicant demonstrates that the cumulative
effect of the proposed development, when combined with all other existing
and anticipated development, will not increase the water surface elevation
of the base flood more than one foot at any location; or
(b)
The City of Oneida agrees to apply to the Federal
Emergency Management Agency (FEMA) for a conditional FIRM revision,
FEMA approval is received and the applicant provides all necessary
data, analyses and mapping and reimburses the City of Oneida for all
fees and other costs in relation to the application. The applicant
must also provide all data, analyses and mapping and reimburse the
City of Oneida for all costs related to the final map revision.
(2)
On streams with a regulatory floodway, as shown on the Flood Boundary and Floodway Map or the Flood Insurance Rate Map adopted in § 64-6, Basis for establishing areas of special flood hazard, no new construction, substantial improvements or other development in the floodway (including fill) shall be permitted unless:
(a)
A technical evaluation by a licensed professional
engineer shows that such an encroachment shall not result in any increase
in flood levels during occurrence of the base flood; or
(b)
The City of Oneida agrees to apply to the Federal
Emergency Management Agency (FEMA) for a conditional FIRM and floodway
revision, FEMA approval is received and the applicant provides all
necessary data, analyses and mapping and reimburses the City of Oneida
for all fees and other costs in relation to the application. The applicant
must also provide all data, analyses and mapping and reimburse the
City of Oneida for all costs related to the final map revisions.
A.
Anchoring. New structures and substantial improvement
to structures in areas of special flood hazard shall be anchored to
prevent flotation, collapse or lateral movement during the base flood.
This requirement is in addition to applicable state and local anchoring
requirements for resisting wind forces.
B.
Construction materials and methods.
(1)
New construction and substantial improvements to structures
shall be constructed with materials and utility equipment resistant
to flood damage.
(2)
New construction and substantial improvements to structures
shall be constructed using methods and practices that minimize flood
damage.
(3)
For enclosed areas below the lowest floor of a structure
within Zone A1-A30, AE or AH, and also Zone A if base flood elevation
data are available, new and substantially improved structures shall
have fully enclosed areas below the lowest floor that are usable solely
for parking of vehicles, building access or storage in an area other
than a basement and which are subject to flooding, 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 licensed professional engineer or architect
or meet or exceed the following minimum criteria:
(a)
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; and
(b)
The bottom of all such openings no higher than
one foot above the lowest adjacent finished grade.
(c)
Openings may be equipped with louvers, valves,
screens or other coverings or devices, provided that they permit the
automatic entry and exit of floodwaters. Enclosed areas subgrade on
all sides are considered basements and are not permitted.
C.
Utilities.
(1)
Machinery and equipment servicing a building must
either be elevated to or above the base flood level or designed to
prevent water from entering or accumulating within the components
during a flood. This includes heating, ventilating and air-conditioning
equipment, hot water heaters, appliances, elevator lift machinery
and electrical junction and circuit breaker boxes. When located below
the base flood elevation, a professional engineer's or architect's
certification of the design is required.
(2)
New and replacement water supply systems shall be
designed to minimize or eliminate infiltration of floodwaters into
the system.
(3)
New and replacement sanitary sewage systems shall
be designed to minimize or eliminate infiltration of floodwaters.
Sanitary sewer and storm drainage systems for buildings that have
openings below the base flood elevation shall be provided with automatic
backflow valves or other automatic backflow devices that are installed
in each discharge line passing through a building's exterior wall.
(4)
On-site waste disposal systems shall be located to
avoid impairment to them or contamination from them during flooding.
The following standards, in addition to the standards in § 64-22A, Subdivision proposals; § 64-22B, Encroachments; and § 64-23, Standards for all structures, apply to structures located in areas of special flood hazard as indicated:
A.
Within Zones A1-A30, AE and AH, and also Zone A if
base flood elevation data are available, new construction and substantial
improvements shall have the lowest floor (including basement) elevated
to or above the base flood level.
B.
Within Zone A, when no base flood elevation data are
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 the depth number specified in feet on the community's Flood Insurance Rate Map enumerated in § 64-6, Basis for establishing areas of special flood hazard (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.
The following standards apply to new and substantially improved commercial, industrial and other nonresidential structures, in addition to the requirements in § 64-22A, Subdivision proposals; § 64-22B, Encroachments; and § 64-23, 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 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.
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 the depth number
specified in feet on the community's FIRM (at least two feet if no
depth number is specified); or
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 City Engineer that certifies that the design and methods of construction are in accordance with accepted standards of practice for meeting the provisions of § 64-25A(2), Elevation of nonresidential structures, 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 basement) shall be elevated
at least three feet above the highest adjacent grade.
The following standards, in addition to the standards in § 64-22, General standards, and § 64-23, 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 placed on sites within Zones
A1-A30, AE and AH shall either:
(1)
Be on site fewer than 180 consecutive days;
(2)
Be fully licensed and ready for highway use (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); or
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 Zones 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:
(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
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 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 § 64-6, Basis for establishing areas of special flood hazard (at least two feet if no depth number is specified). Elevation on piers consisting of dry stacked blocks is prohibited.
