[Ord. No. 15-08-02 Art. IV § A, 8-13-2015]
A. No permit for floodplain development shall be granted
for new construction, substantial improvements, and other improvements,
including the placement of manufactured homes, within any unnumbered
A zone 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 one-hundred-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. All new construction, subdivision proposals, substantial
improvements, prefabricated buildings, 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 flood waters into the systems and discharges from the systems into
flood waters, and on-site waste disposal systems be located so as
to avoid impairment or contamination; and
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, of five (5) acres or
fifty (50) lots, whichever is lesser, include within such proposals
base flood elevation data.
D. 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.
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.
[Ord. No. 15-08-02 Art. IV § B, 8-13-2015]
A. In all areas of special flood hazard, once base flood elevation data is obtained as set forth in Article
IV, Section
410.140(B), the following provisions are required:
1.
Residential Construction. New construction or
substantial improvement of any residential structure, including manufactured
homes, shall have the lowest floor, including basement, elevated to
one (1) foot above the base flood level.
2.
Non-Residential Construction. New construction or substantial improvement of any commercial, industrial, or other non-residential structure, including manufactured homes, shall have the lowest floor, including basement, elevated to one (1) foot above the base flood level or, together with attendant utility and sanitary facilities, be floodproofed so that below the base flood level 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
410.120(A)(7)(c).
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 openings shall be no higher
than one (1) foot above grade. Openings may be equipped with screens,
louvers, valves, or other coverings or devices, provided that they
permit the automatic entry and exit of floodwaters.
B. In all areas of special flood hazard, once floodway data is obtained, as set forth in Article
IV, Section
410.140(B), the following provisions are required:
1.
The designated floodway shall be based on the
standard that the area chosen for the floodway must be designed to
carry the waters of the base flood, without increasing the water surface
elevation more than one (1) foot at any point; and
2.
The community shall prohibit any encroachments,
including fill, new construction, substantial improvements, and other
development within the designated regulatory floodway unless it has
been demonstrated through hydrologic and hydraulic analyses performed
in accordance with standard engineering practices that the proposed
encroachment would not result in any increase in flood levels within
the community during the occurrence of the base flood discharge.
[Ord. No. 15-08-02 Art. IV § C, 8-13-2015]
A. All manufactured homes to be placed within special
flood hazard areas 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 A zones on the community's FIRM on sites
outside of manufactured home parks or subdivisions; 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 level and be securely attached to
an adequately anchored foundation system to resist flotation, collapse,
and lateral movement.
C. Require that manufactured homes to be placed or substantially improved on sites in an existing manufactured home park or subdivision within unnumbered A zones on the community's FIRM that are not subject to the provisions of Article
IV, Section
410.160(B) of this Chapter, be elevated so that either:
1.
The lowest floor of the manufactured home is
one (1) foot above the base flood level; 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.
[Ord. No. 15-08-02 Art. IV § D, 8-13-2015]
A. Require that recreational vehicles placed on sites
within unnumbered A zones on the community's FHBM or FIRM either:
1.
Be on the site for fewer than one hundred eighty
(180) consecutive days;
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 the anchoring
requirements for manufactured homes of this Chapter.