In all areas of special flood hazard the following general standards
are required:
A.
Anchoring.
(1)
All new construction and
substantial improvements, including sheds and garages, shall be anchored
to prevent flotation, collapse, or lateral movement of the structure.
(2)
All manufactured homes shall
be anchored to resist flotation, collapse, or lateral movement. Methods
of anchoring may include, but are not to be limited to, use of over-the-top
or frame ties to ground anchors. This requirement is in addition to
applicable state and local anchoring requirements for resisting wind
forces.
B.
Construction materials and methods.
(1)
All new construction and
substantial improvements shall be constructed with materials and utility
equipment resistant to flood damage.
(2)
All new construction and
substantial improvements shall be constructed using methods and practices
that minimize flood damage.
(3)
All new construction and
substantial improvements shall provide compensatory storage at hydraulically
equivalent sites at a ratio 1.5:1 for each cubic foot of fill placed
in the regulatory floodplain.
(4)
All new construction and
substantial improvements shall be constructed on foundations that
are designed and sealed by a registered design professional in compliance
with the currently adopted construction codes and not be constructed
on fill.
(5)
All new construction and
substantial improvements having fully enclosed areas below the lowest
floor that are usable solely for parking of vehicles, building access
or storage shall require a nonconversion agreement in the form of
a deed restriction to be filed with the County Clerk prior to the
request for a certificate of occupancy.
C.
Utilities.
(1)
All new and replacement water
supply systems shall be designed to minimize or eliminate infiltration
of floodwaters into the system;
(2)
New and replacement sanitary
sewage systems shall be designed to minimize or eliminate infiltration
of floodwaters into the systems and discharge from the systems into
floodwaters;
(3)
On-site waste disposal systems
shall be located to avoid impairment to them or contamination from
them during flooding; and
(4)
Electrical, heating, ventilation,
plumbing and air-conditioning equipment ductwork and other service
facilities shall be designed and/or located three feet above base
flood elevation so as to prevent water from entering or accumulating
within the components during conditions of flooding.
D.
Subdivision proposals and site
plan proposals.
(1)
All subdivision proposals
and site plan proposals shall be consistent with the need to minimize
flood damage;
(2)
All subdivision proposals
shall have public utilities and facilities such as sewer, gas, electrical,
and water systems located and constructed to minimize flood damage;
(3)
All subdivision proposals
and site plan proposals shall have adequate drainage provided to reduce
exposure to flood damage; and
(4)
Base flood elevation data
shall be provided for subdivision proposals and site plan proposals
and other proposed development which contains at least 50 lots or
five acres (whichever is less).
E.
Enclosure openings. All new construction
and substantial improvements having 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 shall be 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 registered professional engineer or architect or must
meet or exceed the following minimum criteria:
(1)
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
shall be provided.
(2)
The
bottom of all openings shall be no higher than one foot above grade.
(3)
Openings
may be equipped with screens, louvers, or other coverings or devices
provided that they permit the automatic entry and exit of floodwaters.
In all areas of special flood hazard where base flood elevation data has been provided as set forth in § 171-7 or in § 171-14B the following standards are required:
A.
Residential construction. New
construction and substantial improvement of any residential structure
shall have the lowest floor, including basement, elevated to or above
three feet freeboard above base flood elevation.
B.
Nonresidential construction.
New construction and substantial improvement of any commercial, industrial
or other nonresidential structure shall either have the lowest floor,
including basement, elevated to the level of two feet freeboard above
the base flood elevation or:
(1)
Be dry floodproofed to two
feet above the base flood level so that the structure is watertight
with walls substantially impermeable to the passage of water;
(2)
Have structural components
capable of resisting hydrostatic and hydrodynamic loads and effects
of buoyancy; and
(3)
Be certified by a registered
professional engineer or architect that the design and methods of
construction are in accordance with accepted standards of practice
for meeting the applicable provisions of this subsection. Such certification
shall be provided to the Township Engineer and be in the form of a
FEMA floodproofing certificate.
Located within areas of special flood hazard established in § 171-7 are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of floodwaters which carry debris, potential projectiles, and erosion potential, the following provisions apply:
A.
Prohibit encroachments, including
fill, new construction, substantial improvements, and other development,
unless a technical evaluation demonstrates that encroachment shall
not result in any increase in flood levels during the occurrence of
the base flood discharge.
C.
In all areas of special flood
hazard in which base flood elevation data has been provided and no
floodway has been designated, the cumulative effect of any proposed
development, when combined with all other existing and anticipated
development, shall not increase the water surface elevation of the
base flood more than 0.2 of a foot at any point.
