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 § 87-6:
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):
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 Batavia 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 Batavia 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 Batavia 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 § 87-6, 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 the occurrence of the base flood; or
(b)
The City of Batavia 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 Batavia 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 Batavia 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)
Enclosed areas.
(a)
For enclosed areas below the lowest floor of a structure
within Zones A1-A30, AE or AH and also Zone A, if base flood elevation data
is 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:
(b)
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 two feet or more 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 § 87-14A, Subdivision proposals, and § 87-14B, Encroachments, and § 87-15, 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 is available, new construction and substantial improvements
shall have the lowest floor (including basement) elevated two feet or more
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 the depth number specified in feet on the community's Flood Insurance Rate Map enumerated in § 87-6 (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 § 87-14A, Subdivision proposals, and § 87-14B, Encroachments, and § 87-15, Standards for all structures.
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 two feet or more above the base flood elevation; or
(2)
Be floodproofed so that the structure is watertight below
a level three feet or more 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 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 local administrator that certifies that the design and methods of construction are in accordance with accepted standards of practice for meeting the provisions of Subsection A(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 is 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 § 87-14, General standards, and § 87-15, 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.
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 two feet
or more 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 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. Elevation on piers
consisting of dry stacked blocks is prohibited.