The general requirements of this section apply to all development proposed within special flood hazard areas identified in § 138-4.
A.
All subdivision and development proposals shall be consistent with
the need to minimize flood damage and are subject to all applicable
standards in these regulations.
B.
All subdivision and development proposals shall have utilities and
facilities, such as sewer, gas, electrical, and water systems, located
and constructed to minimize flood damage.
C.
All subdivision and development proposals shall have adequate drainage
provided to reduce exposure to flood damage.
D.
All subdivision proposals and development proposals containing at
least 50 lots or at least five acres, whichever is the lesser, in
FEMA-delineated special flood hazard areas where base flood elevation
data are not available shall be supported by hydrologic and hydraulic
engineering analyses that determine base flood elevations and floodway
delineations. The analyses shall be prepared by a licensed professional
engineer in a format required by FEMA for a conditional letter of
map revision or letter of map revision. Submittal requirements and
processing fees shall be the responsibility of the applicant.
A.
New and replacement water supply systems shall be designed to minimize
or eliminate infiltration of floodwaters into the systems.
B.
New and replacement sanitary sewage systems shall be designed to
minimize or eliminate infiltration of floodwaters into systems and
discharges from systems into floodwaters.
C.
On-site waste disposal systems shall be located to avoid impairment
to or contamination from them during conditions of flooding.
All new construction of buildings and structures, including
placement of manufactured homes and substantial improvements to existing
buildings and structures, that are to be located, in whole or in part,
in special flood hazard areas shall meet the following requirements:
A.
Be designed (or modified) and constructed to safely resist flood
loads. The construction shall provide a complete load path capable
of transferring all loads from their point of origin through the load-resisting
elements to the foundation. Buildings and structures shall be designed,
connected and anchored to resist flotation, collapse or permanent
lateral movement due to structural loads and stresses from flooding
equal to the base flood elevation, including hydrodynamic and hydrostatic
loads and the effects of buoyancy.
B.
Be constructed by methods and practices that minimize flood damage.
C.
Use flood-damage-resistant materials below the elevation of the lowest
floor. See FEMA Technical Bulletin No. 2 – Flood Damage-Resistant
Materials Requirements, and FEMA Technical Bulletin No. 8 –
Corrosion Protection for Metal Connectors in Coastal Areas.
D.
Have electrical systems, equipment and components, and heating, ventilating,
air-conditioning, and plumbing appliances, plumbing fixtures, duct
systems, and other service equipment located at or above the elevation
of the lowest floor. Electrical wiring systems are permitted to be
located below the elevation of the lowest floor, provided they conform
to the provisions of the electrical part of this code for wet locations.
If replaced as part of a substantial improvement, electrical systems,
equipment and components, and heating, ventilation, air-conditioning,
and plumbing appliances, plumbing fixtures, duct systems, and other
service equipment shall meet the requirements of this section. See
FEMA Technical Bulletin No. 4 — Elevator Installation.
E.
As an alternative to § 138-21D, electrical systems, equipment and components, and heating, ventilating, air-conditioning, and plumbing appliances, plumbing fixtures, duct systems, and other service equipment are permitted to be located below the elevation of the lowest floor, provided that they are designed and installed to prevent water from entering or accumulating within the components and to resist hydrostatic and hydrodynamic loads and stresses, including the effects of buoyancy, during the occurrence of the base flood.
G.
In a special flood hazard area with more than one designation (Zones
A, AE, and AO, floodway), meet the requirements of the most-restrictive
designation.
A.
Disposal of fill, including but not limited to rubble, construction
debris, woody debris, and trash, shall not be permitted in special
flood hazard areas.
B.
Where permitted by Article V (Zones A, AE, and AO), fill placed for the purpose of raising the ground level and to support a building or structure shall meet the following requirements:
(1)
Extend laterally from the building footprint to provide for adequate
access, as a function of use; the floodplain administrator may seek
advice from the State Fire Marshal's office and/or the local
fire services agency.
(2)
Be placed and compacted to provide for stability under conditions
of rising and falling floodwaters and resistance to erosion, scour,
and settling.
(3)
Consist of soil or rock materials only.
(4)
Be sloped no steeper than one vertical on two horizontal, unless
approved by the floodplain administrator.
(5)
Be designed with provisions for adequate drainage and no adverse
effect on adjacent properties.
C.
Fill placed for a purpose other than to support a building or structure shall meet the requirements of § 138-22B(2) through (5).
Repair, alteration, or rehabilitation of historic structures shall be subject to the requirements of these regulations unless a determination is made that compliance with these regulations will preclude the structure's continued designation as an historic structure and a variance is granted in accordance with Article VI and such variance is the minimum necessary to preserve the historic character and design of the structure.
A.
Recreational vehicles in special flood hazard areas shall be fully
licensed and ready for highway use and shall be placed on a site for
less than 180 consecutive days.
A.
Underground tanks in special flood hazard areas shall be anchored
to prevent flotation, collapse or lateral movement resulting from
hydrostatic loads, including the effects of buoyancy, during conditions
of the base flood.
B.
Aboveground tanks in special flood hazard areas shall be elevated
and anchored to or above the base flood elevation plus 12 inches or
shall be anchored at grade and designed and constructed to prevent
flotation, collapse, or lateral movement resulting from hydrodynamic
and hydrostatic loads, including the effects of buoyancy, during conditions
of the base flood.
C.
In special flood hazard areas, tank inlets, fill openings, outlets
and vents shall be:
(1)
At or above the base flood elevation or fitted with covers designed
to prevent the inflow of floodwater or outflow of the contents of
the tanks during conditions of the base flood.
(2)
Anchored to prevent lateral movement resulting from hydrodynamic
and hydrostatic loads, including the effects of buoyancy, during conditions
of the base flood.
