In all areas of special flood hazard the following provisions
are required:
A. New construction and substantial improvements shall be anchored to
prevent floatation, collapse or lateral movement of the structure
resulting from hydrodynamic and hydrostatic loads, including the effects
of buoyancy.
B. New construction and substantial improvements shall be constructed
with materials and utility equipment resistant to flood damage.
C. New construction and substantial improvements shall be constructed
by methods and practices that minimize flood damage.
D. Electrical, heating, ventilation, plumbing, air conditioning equipment,
and other service facilities shall be designed and/or located so as
to prevent water from entering or accumulating within the components
during conditions of flooding.
E. New and replacement water supply systems shall be designed to minimize
or eliminate infiltration of floodwaters into the system.
F. New and replacement sanitary sewage systems shall be designed to
minimize or eliminate infiltration of floodwaters into the systems
and discharges from the systems into floodwaters.
G. On-site waste disposal systems shall be located and constructed so
as to avoid impairment to them or contamination from them during flooding.
H. Manufactured homes:
(1) All manufactured (mobile) homes to be placed, substantially improved,
or repaired as a result of substantial damage shall be elevated so
that the lowest floor is above the base flood elevation. This includes
manufactured homes outside of a manufactured home park or subdivision,
in a new manufactured home park or subdivision, in an existing manufactured
home park or subdivision, in an expansion to an existing manufactured
home park or subdivision, or in an existing manufactured home park
or subdivision on which a manufactured home has incurred substantial
damage as a result of a flood.
(2) It shall be placed on a permanent foundation which itself is securely
anchored and to which the structure is securely anchored so that it
will resist floatation, lateral movement, and hydrodynamic and hydrostatic
pressures. Anchoring may include, but not be limited to, the use of
over-the-top or frame ties to ground anchors.
(3) It shall be installed using methods and practices which minimize
flood damage.
(a)
Adequate access and drainage should be provided.
(b)
Elevation construction standards include the placement of piling
foundations no more than 10 feet apart, and reinforcement of piers
extending more than six feet above ground level.
(4) Recreational vehicles.
(a)
Recreational vehicles placed on sites within all areas of special
flood hazard shall either:
[1]
Be on the site for fewer than 180 consecutive days, and be fully
licensed and ready for highway use; or
(b)
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.
I. In any portion of a watercourse which is altered or relocated, the
flood-carrying capacity shall be maintained.
J. A structure already in compliance with the provisions of this chapter
shall not be made non-compliant by any alteration, repair, reconstruction
or improvement to the structure.
Located within the areas of special flood hazard are areas designated
as shallow flooding areas (AO Zones). These areas have flood hazards
associated with base flood depths of one to three feet where a clearly
defined channel does not exist and where the path of flooding is unpredictable
and indeterminate. In AO Zones, the following provisions apply:
A. For residential structures, all new construction, substantial improvements
and repair to structures that have sustained substantial damage shall
have the lowest floor, including basement, elevated to the depth number
specified on the Flood Insurance Rate Map (FIRM), in feet, above the
highest adjacent grade. If no depth number is specified, the lowest
floor, including basement, shall be elevated at least two feet above
the highest adjacent grade.
B. For non-residential structures, all new construction, substantial
improvements and repair to structures that have sustained substantial
damage shall:
(1) Have the lowest floor, including basement, elevated to the depth
number specified on the Flood Insurance Rate Map (FIRM), in feet,
above the highest adjacent grade. If no depth number is specified,
the lowest floor, including basement, shall be elevated at least two
feet above the highest adjacent grade; or
(2) Together with attendant utility and sanitary facilities, be completely
flood-proofed to or above the depth number, in feet, specified on
the FIRM above the highest adjacent grade, or if no depth number is
specified, at least two feet above the highest adjacent grade, so
that any space below that level is watertight with walls substantially
impermeable to the passage of water and with structural components
having the capability of resisting hydrostatic and hydrodynamic loads
and effects of buoyancy. Designs for complying with this requirement
must be certified by either a Connecticut licensed professional engineer
or architect.
C. On-site drainage for all proposed structures in AO Zones located
on slopes shall provide adequate drainage paths to guide flood waters
around and away from such structures.