[Code 2005 § 46-76; Ord. No. 04-17-07-07, art. V, § A, 4-17-2007]
In all areas of special flood hazards the following provisions
are required for all new construction and substantial improvements:
(1)
All new construction or substantial improvements shall be designed
(or modified) and adequately anchored to prevent flotation, collapse
or lateral movement of the structure resulting from hydrodynamic and
hydrostatic loads, including the effects of buoyancy;
(2)
All new construction or substantial improvements shall be constructed
by methods and practices that minimize flood damage;
(3)
All new construction or substantial improvements shall be constructed
with materials resistant to flood damage;
(4)
All new construction or substantial improvements shall be constructed
with electrical, heating, ventilation, plumbing, and air conditioning
equipment and other service facilities that are designed and/or located
so as to prevent water from entering or accumulating within the components
during conditions of flooding;
(5)
All new and replacement water supply systems shall be designed to
minimize or eliminate infiltration of flood waters into the system;
(6)
New and replacement sanitary sewage systems shall be designed to
minimize or eliminate infiltration of flood waters into the system
and discharge from the systems into flood waters; and,
(7)
Onsite waste disposal systems shall be located to avoid impairment
to them or contamination from them during flooding.
[Code 2005 § 46-77; Ord. No. 04-17-07-07, art. V, § B, 4-17-2007]
In all areas of special flood hazards where base flood elevation data has been provided as set forth in § 7-19, § 7-26(8), or § 7-31(3), the following provisions are required:
(1)
Residential construction. New construction and substantial improvement of any residential structure shall have the lowest floor (including basement), elevated to or above the base flood elevation. A registered professional engineer, architect, or land surveyor shall submit a certification to the floodplain administrator that the standard of this subsection as proposed in § 7-27 is satisfied.
(2)
Nonresidential construction. New construction and substantial improvements
of any commercial, industrial or other nonresidential structure shall
either have the lowest floor (including basement) elevated one foot
above the base flood level or together with attendant utility and
sanitary facilities, be designed so that one foot above 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
develop and/or review structural design, specifications, and plans
for the construction, and shall certify that the design and methods
of construction are in accordance with accepted standards of practice
as outlined in this subsection. The floodplain administrator shall
maintain a record of all floodproofing certifications that includes
the specific elevation (in relation to mean sea level) to which each
structure has been floodproofed.
(3)
Enclosures. New construction and substantial improvements, with fully
enclosed areas below the lowest floor that are usable solely for parking
of vehicles, building access or storage in an area other than a basement
and which 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 openings having a total net area of not less than
one square inch for every square foot of enclosed area subject to
flooding shall be provided.
b.
The bottom of all openings shall be no higher than one foot above
grade.
c.
Openings may be equipped with screens, louvers, valves, or other
coverings or devices provided that they permit the automatic entry
and exit of floodwaters.
(4)
Manufactured homes.
a.
Require that all manufactured homes to be placed within zone A on
a community's FHBM or FIRM shall 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.
This requirement is in addition to applicable state and local anchoring
requirements for resisting wind forces.
b.
Require that manufactured homes that are placed or substantially
improved within zones A1-30, AH, and AE on the community's FIRM
on sites:
1.
Outside of a 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 a result of a flood, be
elevated on a permanent foundation such that the lowest floor of the
manufactured home is elevated one foot above the base flood elevation
and be securely anchored 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 with
zones A1-30, AH and AE on the community's FIRM that are not subject
to the provisions of Subsection (4) of this section be elevated so
that the lowest floor of the manufactured home is elevated one foot
above the base flood elevation and elevated on reinforced piers or
other foundation elements and be securely anchored to an adequately
anchored foundation system to resist flotation, collapse, and lateral
movement support the manufactured home chassis.
(5)
Recreational vehicles. Require that recreational vehicles placed
on sites within zones A1-30, AH, and AE on the community's FIRM
either:
a.
Be on the site for fewer than 180 consecutive days;
b.
Be fully licensed and ready for highway use; or
c.
Meet the permit requirements of § 7-27(1), and the elevation
and anchoring requirements for "manufactured homes" in Subsection
(4) of this section. 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.
(6)
Accessory structure.
a.
Structure is low valued and represents a minimal investment.
b.
Structure shall be small and not exceed 600 square feet in size.
c.
Structure shall be unfinished on the interior.
d.
Structure can be used only for parking and limited storage.
e.
Structure shall not be used for human habitation (including work,
sleeping, living, cooking, or restroom areas).
f.
Service facilities such as electrical and heating equipment must
be elevated to or above the BFE or floodproofed.
g.
Structure is constructed and placed on building site so as to offer
the minimum resistance to the flow of floodwaters.
h.
Structure is designed to have low flood damage potential i.e. constructed
with flood resistance materials.
i.
Structure is firmly anchored to prevent flotation, collapse, and
lateral movement.
j.
Floodway requirements must be met in the construction of the structure.
k.
Openings to relieve hydrostatic pressure during a flood shall be
provided below the BFE. Structure is to be located so as not to cause
damage to adjacent and nearby structures.
[Code 2005 § 46-78; Ord. No. 04-17-07-07, art. V, § C, 4-17-2007]
(3)
Base flood elevation data shall be generated for subdivision proposals and other proposed development including the placement of manufactured home parks and subdivisions which is greater than 50 lots or five acres, whichever is lesser, if not otherwise provided pursuant to § 7-19, or subsection § 7-26(8) of this article.
(4)
All subdivision proposals including the placement of manufactured
home parks and subdivisions shall have adequate drainage provided
to reduce exposure to flood hazards.
(5)
All subdivision proposals including the placement of manufactured
home parks and subdivisions shall have public utilities and facilities
such as sewer, gas, electrical and water systems located and constructed
to minimize or eliminate flood damage.
[Code 2005 § 46-79; Ord. No. 04-17-07-07, art. V, § D, 4-17-2007]
Located within the areas of special flood hazard established in § 7-19, are areas designated as shallow flooding. These areas have special flood hazards associated with base flood depths of one to three feet where a clearly defined channel does not exist and where the path of flooding is unpredictable and where velocity flow may be evident. Such flooding is characterized by ponding or sheet flow; therefore, the following provisions apply:
(1)
All new construction and substantial improvements of residential
structures 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 one foot if no depth
number is specified).
(2)
All new construction and substantial improvements of nonresidential
structures;
a.
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 one foot if no depth number
is specified), or;
b.
Together with attendant utility and sanitary facilities be designed
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 of effects of buoyancy.
(3)
A registered professional engineer or architect shall submit a certification to the floodplain administrator that the standards of this section, as proposed in § 7-26 are satisfied.
(4)
Require within zones AH or AO adequate drainage paths around structures
on slopes, to guide flood waters around and away from proposed structures.
[Code 2005 § 46-90; Ord. No. 04-17-07-07, art. V, § E, 4-17-2007]
Floodways. Located within areas of special flood hazard established in § 7-19, are areas designated as floodways. Since the floodway is an extremely hazardous area due to the velocity of floodwaters which carry debris, potential projectiles and erosion potential, the following provisions shall apply:
(1)
Encroachments are prohibited, 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.
(2)
If Subsection (1) above is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of Division 3.
(3)
Under the provisions of 44 CFR Chapter 1, § 65.12, of the National Flood Insurance Regulations, 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 complete all of the provisions required by § 65.12.
