The general requirements of this section apply to all development proposed within all special flood hazard areas identified in § 149-5.
A.
In all flood zones:
(1)
Subdivision proposals and development proposals shall be consistent
with the need to minimize flood damage and are subject to all applicable
standards in these regulations.
(2)
Subdivision proposals and development proposals shall have utilities
and facilities, such as sewer, gas, electrical, and water systems,
located and constructed to minimize flood damage.
(3)
Subdivision proposals and development proposals shall have adequate
drainage paths provided to reduce exposure to flood hazards and to
guide floodwaters around and away from proposed structures.
(4)
Subdivision proposals and development proposals containing at least five lots or at least five acres, whichever is the lesser, that are wholly or partially in flood hazard areas where base flood elevation data are not provided by the Floodplain Administrator or available from other sources, shall be supported by determinations of base flood elevations as required in § 149-15 of these regulations.
(5)
Subdivision access roads shall have the driving surface at or above
the base flood elevation.
B.
In special flood hazard areas of nontidal waters of the state:
(1)
Subdivision proposals shall be laid out such that proposed building
pads are located outside of the special flood hazard area and any
portion of platted lots that include land areas that are below the
base flood elevation shall be used for other purposes, deed restricted,
or otherwise protected to preserve it as open space.
(2)
Subdivision access roads shall have the driving surface at or above
the base flood elevation.
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.
New buildings and structures (including the placement and replacement
of manufactured homes) and substantial improvement of existing structures
(including manufactured homes) that are located, in whole or in part,
in any special flood hazard area shall:
A.
Be designed (or modified) and constructed to safely support 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. Structures shall be designed, connected
and anchored to resist flotation, collapse or permanent lateral movement
due to structural loads and stresses, including hydrodynamic and hydrostatic
loads and the effects of buoyancy, from flooding equal to the flood
protection elevation or the elevation required by these regulations
or the building code, whichever is higher.
B.
Be constructed by methods and practices that minimize flood damage.
D.
Have electrical systems, equipment and components, and mechanical, 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 required in § 149-34A or 149-35A (A Zones) or § 149-40B (V Zones and Coastal A Zones). Electrical wiring systems are permitted to be located below the elevation of the lowest floor, provided that they conform to the provisions of the electrical part of the building 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.
E.
As an alternative to Subsection D, 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 flooding to that elevation.
F.
Have the electric panelboard elevated at least three feet above the
BFE.
G.
If located in flood hazard areas (A Zones) that are not identified as Coastal A Zones and coastal high-hazard areas (V Zones), comply with the specific requirements of Article V.
I.
If located in coastal high hazard areas (V Zones), comply with the specific requirements of Article VI.
J.
Comply with the requirements of the most restrictive designation
if located on a site that has more than one flood zone designation
(A Zone, designated floodway, Coastal A Zone, V Zone).
Repair, alteration, addition, rehabilitation, or other improvement
of historic structures shall be subject to the requirements of these
regulations if the proposed work is determined to be a substantial
improvement, unless a determination is made that the proposed work
will not preclude the structure's continued designation as an
historic structure. The Floodplain Administrator may require documentation
of a structure's continued eligibility and designation as an
historic structure.
A.
New manufactured homes shall not be placed or installed in floodways
or coastal high-hazard areas (V Zones).
B.
For the purpose of these regulations, the lowest floor of a manufactured
home is the bottom of the lowest horizontal supporting member (longitudinal
chassis frame beam).
C.
New manufactured homes located outside of floodways and coastal high-hazard
areas (V Zones), replacement manufactured homes in any flood hazard
areas, and substantial improvement (including repair of substantial
damage) of existing manufactured homes in all flood hazard areas,
shall:
(2)
Be installed in accordance with the anchor and tie-down requirements
of the building code or the manufacturer's written installation
instructions and specifications; and
(3)
Have enclosures below the lowest floor of the elevated manufactured home, if any, including enclosures that are surrounded by rigid skirting or other material that is attached to the frame or foundation, that comply with the requirements of Article V or Article VI, as applicable to the flood zone.
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[NOTE: See "Protecting Manufactured Homes from Floods and Other
Hazards: A Multi-Hazard Foundation and Installation Guide" (FEMA P-85).]
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Recreational vehicles shall:
Critical and essential facilities shall:
A.
Not be located in coastal high-hazard areas (V Zones), Coastal A
Zones or floodways.
B.
If located in flood hazard areas other than coastal high-hazard areas,
Coastal A Zones and floodways, be elevated to the higher of elevation
required by these regulations plus one foot, the elevation required
by the building code, or the elevation of the two-tenths-percent chance
(five-hundred-year) flood.
In addition to the application requirements of § 149-15, applications for the placement or erection of temporary structures and the temporary storage of any goods, materials, and equipment, shall specify the duration of the temporary use. Temporary structures and temporary storage in floodways shall meet the limitations of § 149-33A of these regulations. In addition:
A.
Temporary structures shall:
(1)
Be designed and constructed to prevent flotation, collapse or lateral
movement resulting from hydrodynamic loads and hydrostatic loads during
conditions of the base flood;
(2)
Have electric service installed in compliance with the electric code;
and
(3)
Comply with all other requirements of the applicable state and local
permit authorities.
B.
Temporary storage shall not include hazardous materials.
A.
Underground tanks in 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.
Above-ground tanks in flood hazard areas shall be anchored to a supporting
structure and elevated to or above the base flood elevation, or shall
be anchored or otherwise 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 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; and
(2)
Anchored to prevent lateral movement resulting from hydrodynamic
and hydrostatic loads, including the effects of buoyancy, during conditions
of the base flood.
Applications for functionally dependent uses that do not conform to the requirements of these regulations shall be approved only by variances issued pursuant to Article VII. If approved, functionally dependent uses shall be protected by methods that minimize flood damage during the base flood, including measures to allow floodwaters to enter and exit, use of flood-damage-resistant materials, and elevation of electric service and equipment to the extent practical given the use of the building.
