[Ord. No. 202323-014, 10-10-2023]
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 numbered or unnumbered A Zones and
AE 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 one percent (1%) annual chance (aka 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 Zones or AE Zones on the community's 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 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, greater than fifty (50) lots or five
(5) acres, whichever is lesser, include within such proposals base
flood elevation data.
E. 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.
F. 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; the accessory structure meets the following
floodplain management requirements; and a floodplain development permit
has been issued. Wet-floodproofing is only allowed for small low-cost
structures.
G. Agricultural
Structures. Structures used solely for agricultural purposes in connection
with the production, harvesting, storage, drying, or raising of agricultural
commodities, including the raising of livestock, 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;
there is no permanent retail, wholesale, or manufacturing use included
in the structure; the structure meets the following floodplain management
requirements; and a floodplain development permit has been issued.
[Ord. No. 202323-014, 10-10-2023]
A. In all areas identified as numbered and unnumbered A Zones and AE Zones, where base flood elevation data have been provided, as set forth in Article
IV, Section
405.140(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 elevation. The elevation of the lowest floor shall
be certified by a Missouri licensed land surveyor, engineer, or architect.
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 above the base flood elevation 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 Missouri 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
405.120(A)(7),
(8),
(9).
3. Enclosures Below Lowest Floor. 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 flood waters.
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, or
other coverings or devices provided that they permit the automatic
entry and exit of flood waters.
[Ord. No. 202323-014, 10-10-2023]
A. All
manufactured homes to be placed within all unnumbered and numbered
A Zones and AE 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 and AE Zones, on the community's FIRM
on sites:
1. Outside of manufactured home park or subdivision;
2. In a new manufactured home park or subdivision;
3. In an expansion to an existing manufactured home park or subdivision;
or
4. 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. The elevation
of the lowest floor shall be certified by a Missouri licensed land
surveyor, engineer, or architect.
C. Require that manufactured homes to be placed or substantially improved on sites in an existing manufactured home park or subdivision within all unnumbered and numbered A Zones and AE Zones, on the community's FIRM, that are not subject to the provisions of Article
IV, Section
405.160(B) of this Chapter, be elevated so that either:
1. The lowest floor of the manufactured home is at 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. 202323-014, 10-10-2023]
A. Located within areas of special flood hazard established in Article
II, Section
405.040 are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of flood waters that carry debris and potential projectiles, the following provisions shall apply:
1. The community shall select and 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. The community shall prohibit any 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.
3. A community may permit encroachments within the adopted regulatory
floodway that would result in an increase in base flood elevations,
provided that the community first applies for a conditional FIRM and
Floodway revision, fulfills the requirements of such revisions as
established under the provisions of 44 CFR § 65.12, and receives
the approval of FEMA.
4. If Article
IV, Section
405.170(A)(2) is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of Article
IV.
5. In unnumbered A Zones, the community shall obtain, review, and reasonably utilize any base flood elevation or floodway data currently available from Federal, State, or other sources as set forth in Article
IV, Section
405.140(B).
[Ord. No. 202323-014, 10-10-2023]
A. Require
that recreational vehicles placed on sites within all unnumbered and
numbered A Zones, and AE Zones on the community's 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*; or
3. Meet the permitting, elevation, and anchoring requirements for manufactured
homes of this Chapter.
* 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.
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