In all areas of special flood hazard the following provisions
are required:
A. New construction and substantial improvements shall be anchored to
prevent flotation, collapse or lateral movement of the structure;
B. New construction, substantial improvements and structures that have
sustained substantial damage shall be constructed with materials and
utility equipment that are flood damage resistant and conform to the
provisions of FEMA Technical Bulletin 2, Flood Damage-Resistant Material
Requirements. This includes but is not limited to flooring, interior
and exterior walls, wall coverings and other materials installed below
the base flood elevation plus one foot;
C. New construction and substantial improvements shall be constructed
by methods and practices that minimize flood damage;
D. The bottom of all electrical, heating, plumbing, ventilation and
air conditioning equipment, appliances, fixtures and components, HVAC
duct work and duct systems and any other utility service equipment,
facilities, machinery, or connections serving the structure shall
be elevated one foot above the base flood elevation (BFE). This includes
but is not limited to furnaces, oil or propane tanks, air conditioners,
heat pumps, hot water heaters, ventilation duct work, washer and dryer
hook-ups, electrical junction boxes, and circuit breaker boxes. Systems,
fixtures, equipment and components shall not be mounted on or penetrate
through breakaway walls intended to fail under flood conditions. Connections
or other equipment that must be located below the BFE plus one foot
elevation are permitted only when no other elevation alternative is
available provided, they are designed and installed to prevent water
from entering and or accumulating within the components and to resist
hydrostatic and hydrodynamic loads and stresses, including the effects
or buoyance, during the occurrence of the base flood event. Electrical
wiring systems that must be located below the BFE plus one foot shall
conform to the standards for wet locations;
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 system into floodwaters and shall be subject
to review and approval by the Superintendent of the Plainville Water
Pollution Control Authority;
G. On-site waste disposal systems shall be located and constructed to
avoid impairment to them or contamination from them during flooding
and shall be subject to review and approval by the Plainville Town
Sanitarian;
H. Underground tanks shall be anchored to prevent flotation, collapse
and lateral movement under conditions of the base flood. Aboveground
storage tanks which are located outside or inside of a structure must
be elevated one foot above the base flood elevation (BFE) or shall
be securely anchored to prevent flotation, collapse or lateral movement
under conditions of the base flood. Where elevated on platforms, the
platforms shall be cantilevered from or knee braced to the building
or shall be supported on elevated foundations that conform to the
standards for the particular flood zone as described herein. Anchored
tanks must have the top of the fill pipe located at least one foot
above the BFE and have a screw fill cap that does not allow for the
infiltration of floodwater;
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 noncompliant by any alteration, repair, reconstruction
or improvement to the structure;
K. Compensatory storage. The water holding capacity of the floodplain,
except those areas which are tidally influenced shall not be reduced.
Any reduction caused by filling, new construction or substantial improvements
involving an increase in footprint to the structure shall be compensated
for by deepening and or widening the floodplain. Storage shall be
provided on site unless easements have been gained from adjacent property
owners; it shall be provided within the same hydraulic reach and a
volume not previously used for flood storage; it shall be hydraulically
comparable and incrementally equal to the theoretical volume of floodwater
at each elevation up to and including the 100-year flood elevation,
which would be displaced by the proposed project. Such compensatory
volume shall have an unrestricted connection to the same waterway
or water body. Compensatory storage can be provided off site if approved
by the Town of Plainville;
L. Equal conveyance. Within the floodplain, except those areas which
are tidally influence, as designated on the Flood Insurance Rate Map
(FIRM) for the Town of Plainville, encroachments resulting from filling,
new construction or substantial improvements involving an increase
in footprint of the structure are prohibited unless the applicant
provides certification by a registered professional engineer demonstrating
with supporting hydrologic and hydraulic analyses performed in accordance
with standard engineering practice that such encroachments shall not
result in any (0.00 feet) increase in flood levels. Work within the
floodplain and the land adjacent to the floodplain, including work
to provide compensatory storage shall not be constructed in such a
way so as to cause an increase in flood stage or flood velocity.
Recreational vehicles placed on sites within a special flood
hazard area shall either be on the site for fewer than 180 consecutive
days and be fully licensed and ready for highway use, or meet all
the general standards of elevation and anchoring as specified herein.
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.