[Bill No. 138, 4-26-2006]
A. No permit for floodplain development shall be granted for any new
construction, substantial improvements, and other improvements, including
the placement of manufactured homes, within any unnumbered or numbered
A zones, AE, AO, and AH zones, unless the conditions of this Section
are satisfied.
B. All areas identified as unnumbered A zones on the FIRM are subject
to inundation of the 100-year flood; however, the base flood elevation
is not provided. Development within unnumbered A zones is subject
to all provisions of this Chapter. If Flood Insurance Study data is
not available, the community shall obtain, review, and reasonably
utilize any base flood elevation or floodway data currently available
from Federal, State, or other sources.
C. Until a floodway is designated, no new construction, substantial
improvements, or other development, including fill, shall be permitted
within any numbered A zone or AE zone on the FIRM, unless it is demonstrated
that the cumulative effect of the proposed development, when combined
with all other existing and anticipated development, will not increase
the water surface elevation of the base flood more than one (1) foot
at any point within the community.
D. All new construction, subdivision proposals, substantial improvements,
prefabricated structures, placement of manufactured homes, and other
developments shall require:
1.
Design or adequate anchorage to prevent flotation, collapse,
or lateral movement of the structure resulting from hydrodynamic and
hydrostatic loads, including the effects of buoyancy;
2.
Construction with materials resistant to flood damage;
3.
Utilization of methods and practices that minimize flood damages;
4.
All electrical, heating, ventilation, plumbing, air-conditioning
equipment, and other service facilities be designed and/or located
so as to prevent water from entering or accumulating within the components
during conditions of flooding;
5.
New or replacement water supply systems and/or sanitary sewage
systems be designed to minimize or eliminate infiltration of floodwaters
into the systems and discharges from the systems into floodwaters,
and on-site waste disposal systems be located so as to avoid impairment
or contamination;
6.
Subdivision proposals and other proposed new development, including
manufactured home parks or subdivisions, located within special flood
hazard areas are required to assure that:
a.
All such proposals are consistent with the need to minimize
flood damage;
b.
All public utilities and facilities, such as sewer, gas, electrical,
and water systems are located and constructed to minimize or eliminate
flood damage;
c.
Adequate drainage is provided so as to reduce exposure to flood
hazards; and
d.
All proposals for development, including proposals for manufactured
home parks and subdivisions, greater that five (5) acres or fifty
(50) lots, whichever is lesser, include within such proposals base
flood elevation data.
E. Accessory Structures. Structures used solely for parking and limited
storage purposes, not attached to any other structure on the site,
of limited investment value, and not larger than four hundred (400)
square feet, may be constructed at-grade and wet-floodproofed provided
there is no human habitation or occupancy of the structure; the structure
is of single-wall design; a variance has been granted from the standard
floodplain management requirements of this Chapter; and a floodplain
development permit has been issued.
F. Storage, Material, And Equipment.
1.
The storage or processing of materials within the special flood
hazard area that are in time of flooding buoyant, flammable, explosive,
or could be injurious to human, animal, or plant life is prohibited.
2.
Storage of other material or equipment may be allowed if not
subject to major damage by floods, if firmly anchored to prevent flotation,
or if readily removable from the area within the time available after
a flood warning.
[Bill No. 138, 4-26-2006]
A. In all areas identified as unnumbered and number A zones, AE, and AH zones, where base flood elevation data have been provided, as set forth in Article
IV, Section
410.150(B), the following provisions are required:
1.
Residential Construction. New construction or substantial improvement
of any residential structures, including manufactured homes, shall
have the lowest floor, including basement, elevated to one (1) foot
above base flood level.
2.
Non-Residential Construction. New construction or substantial improvement of any commercial, industrial, or other non-residential structures, including manufactured homes, shall have the lowest floor, including basement, elevated to one (1) foot about the base flood level or, together with attendant utility and sanitary facilities, be floodproofed so that below the base flood elevation the structure 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. A registered professional engineer or architect shall certify that the standards of this Subsection are satisfied. Such certification shall be provided to the Floodplain Administrator as set forth in Article
III, Section
410.130(A)(9).
3.
Require, for all new construction and substantial improvements,
that fully enclosed areas below lowest floor used solely for parking
of vehicles, building access, or storage in an area other than a basement
and that 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 meet or exceed the following minimum criteria:
a.
A minimum of two (2) openings having a total net area of not
less than one (1) square inch for every square foot of enclosed area
subject to flooding shall be provided; and
b.
The bottom of all opening shall be no higher than one (1) foot
above grade. Openings may be equipped with screens, louvers, valves,
and other coverings or devices provided that they permit the automatic
entry and exit of floodwaters.
[Bill No. 138, 4-26-2006]
A. All manufactured homes to be placed within all unnumbered and numbered
A zones, AE, and AH zones, on the community's FIRM shall be required
to be installed using methods and practices that minimize flood damage.
For the purposes of this requirement, manufactured homes must be elevated
and anchored to resist flotation, collapse, or lateral movement. Methods
of anchoring may include, but are not limited to, use of over-the-top
or frame ties to ground anchors.
B. Require manufactured homes that are placed or substantially improved
within unnumbered or numbered A zones, AE, and AH zones on the community's
FIRM on sites outside of a manufactured home park or subdivision,
in a new 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 the result of a flood, be elevated
on a permanent foundation such that the lowest floor of the manufactured
home is elevated to one (1) foot above the base flood elevation and
be securely attached to an adequately anchored foundation system to
resist flotation, collapse, and lateral movement.
C. Require that manufactured homes be placed or substantially improved on sites in an existing manufactured home park or subdivision within all unnumbered or numbered A zones, AE, and AH zones on the community's FIRM, that are not subject to the provisions of Article
IV, Section
410.170(B) of this Chapter, be elevated so either:
1.
The lowest floor of the manufactured home is at one (1) foot
above the base flood elevation; or
2.
The manufactured home chassis is supported by reinforced piers
or other foundation elements of at least equivalent strength that
are no less than thirty-six (36) inches in height above grade and
be securely attached to an adequately anchored foundation system to
resist flotation, collapse, and lateral movement.
[Bill No. 138, 4-26-2006]
A. Located within these areas of special flood hazard as described in Article
II, Section
410.040 are areas designated as AO zones. These areas have special flood hazards associated with base flood depths of one (1) to three (3) feet where a clearly defined channel does not exist and where the path of flooding is unpredictable and indeterminate. The following provisions apply:
1.
AO Zones.
a.
All new and substantial improvements of residential structures,
including manufactured homes, shall have the lowest floor, including
basement, elevated above the highest adjacent grade at least as high
as the depth number specified in feet on the community's FIRM [at
least two (2) feet if no depth number is specified].
b.
All new construction and substantial improvements of any commercial,
industrial, or other non-residential structures, including manufactured
homes, shall have the lowest floor, including basement, elevated above
the highest adjacent grade at least as high as the depth number specified
in feet on the community FIRM [at least two (2) feet if no depth number
is specified] or together with attendant utilities and sanitary facilities
can be completely floodproofed so that the structure 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.
c.
Adequate drainage paths shall be required around structures
on slopes, in order to guide floodwaters around and away from proposed
structures.
2.
AH Zones.
a.
The specific standards for all areas of special flood hazard where base flood elevation has been provided shall be required as set forth in Article
IV, Section
410.160 and
410.170.
b.
Adequate drainage paths shall be required around structures
on slopes, in order to guide floodwaters around and away from proposed
structures.
[Bill No. 138, 4-26-2006]
A. If a community determines there are areas of special flood hazard that may be defined as floodway, through the use of base flood elevation and floodway data available from a Federal, State, or other source, including data developed pursuant to Article
IV, Section
410.150(D)(6)(d), and determines this data is suitable as criteria for requiring that new construction, substantial improvements, or other development in Zone A, the community must meet the standards below:
1.
Adopt a regulatory floodway based on the principle that the
area chosen for the regulatory floodway must be designed to carry
the waters of the base flood without increasing the water surface
elevation of that flood more than one (1) foot at any point.
2.
Prohibit encroachments, including fill, new construction, substantial
improvements, and other development within the adopted regulatory
floodway unless it has been demonstrated through hydrologic and hydraulic
analyses performed in accordance with standard engineering practice
that the proposed encroachment would not result in any increase in
flood levels within the community during the occurrence of the base
flood discharge.
[Bill No. 138, 4-26-2006]
A. Require that recreational vehicles placed on sites within all unnumbered
and numbered A zones, AO, AE, and AH zones on the community's FIRM
either:
1.
Be on the site for fewer than one hundred eighty (180) consecutive
days; or
2.
Be fully licensed and ready for highway use (NOTE: 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);
or
3.
Meet the permitting, elevation, and anchoring requirements for
manufactured homes of this Chapter.