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.
A.
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):
A.
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:
(1)
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
(2)
The Town of Pittsford 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 Town of Pittsford for
all fees and other costs in relation to the application. The applicant
must also provide all data, analyses and mapping and reimburse the
Town of Pittsford for all costs related to the final map revision.
B.
On streams with a regulatory floodway, as shown on the Flood Boundary and Floodway Map or the Flood Insurance Rate Map adopted in § 95-5 of this chapter, no new construction, substantial improvements or other development in the floodway (including fill) shall be permitted unless:
(1)
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
(2)
The Town of Pittsford 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 Town of Pittsford
for all fees and other costs in relation to the application. The applicant
must also provide all data, analyses and mapping and reimburse the
Town of Pittsford 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.
New construction and substantial improvements to structures
shall be constructed with materials and utility equipment resistant
to flood damage.
C.
New construction and substantial improvements to structures
shall be constructed using methods and practices that minimize flood
damage.
D.
Enclosed areas.
(1)
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:
(2)
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.
E.
For crawl spaces, the elevation of the floor of this
enclosed area, which may be of soil, gravel, concrete or other material,
must be equal to or above the lowest adjacent exterior grade. The
enclosed crawl space area shall be properly vented to allow for the
equalization of hydrostatic forces which would be experienced during
periods of flooding.
A.
New and replacement electrical equipment, heating,
ventilating, air conditioning, plumbing connections, and other service
equipment shall be located at or above the base flood elevation or
be designed to prevent water from entering and accumulating within
the components during a flood and to resist hydrostatic and hydrodynamic
loads and stresses. Electrical wiring and outlets, switches, junction
boxes and panels shall be elevated to or above the base flood elevation
unless they conform to the appropriate provisions of the electrical
part of the Building Code of New York State, the Existing Building
Code of New York State or the Residential Code of New York State for
location of such items in wet locations.
B.
New and replacement water supply systems shall be
designed to minimize or eliminate infiltration of floodwaters into
the system.
C.
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.
D.
On-site waste disposal systems shall be located to
avoid impairment to them or contamination from them during flooding.
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
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.
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.