In all areas of special flood hazard, the following standards
are required:
A. Anchoring.
(1) All new construction and substantial improvements shall be anchored
to prevent flotation, collapse, or lateral movement of the structure
and capable of resisting hydrostatic and hydrodynamic loads.
(2) All manufactured homes must be elevated and anchored to resist flotation,
collapse or lateral movement and capable of resisting the hydrostatic
and hydrodynamic loads. 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. Specific requirements may
be:
(a)
Over-the-top ties be provided at each of the four corners of
the manufactured home, with two additional ties per side at intermediate
locations, with manufactured homes less than 50 feet long requiring
one additional tie per side;
(b)
Frame ties be provided at each corner of the home with five
additional ties per side at intermediate points, with manufactured
homes less than 50 feet long requiring four additional ties per side;
(c)
All components of the anchoring system be capable of carrying
a force of 4,800 pounds; and
(d)
Any additions to the manufactured home be similarly anchored.
B. Construction Materials and Methods.
(1) All new construction and substantial improvements shall be constructed
with materials and utility equipment resistant to flood damage.
(2) All new construction and substantial improvements shall be constructed
using methods and practices that minimize flood damage.
(3) All new construction and 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.
C. Utilities.
(1) All new and replacement water supply systems shall be designed to
minimize or eliminate infiltration of floodwaters into the system;
(2) New and replacement sanitary sewage systems shall be designed to
minimize or eliminate infiltration of floodwaters into the systems
and discharge from the systems into floodwaters; and
(3) On-site waste disposal systems shall be located to avoid impairment
to them or contamination from them during flooding.
D. Subdivision Proposals.
(1) All subdivision proposals shall be consistent with the need to minimize
flood damage;
(2) All subdivision proposals shall have public utilities and facilities
such as sewer, gas, electrical, and water systems located and constructed
to minimize flood damage;
(3) All subdivision proposals shall have adequate drainage provided to
reduce exposure to flood damage;
(4) Base flood elevation data shall be provided for subdivision proposals
and other proposed development which contain at least 50 lots or five
acres (whichever is less); and
(5) All proposals for the development of subdivisions including the placement of manufactured home parks and subdivisions shall meet development permit requirements of §§
7-138, 7-139 and
7-140.
In all areas of special flood hazard where base flood elevation data has been provided as set forth in §
7-136B, Use of Other Base Flood Data, the following standards are required:
A. 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.
B. Nonresidential Construction. New construction and substantial improvement
of any commercial, industrial or other nonresidential structure shall
either have the lowest floor (including basement) elevated to the
level of the base flood elevation; or, together with attendant utility
and sanitary facilities, shall:
(1) Be floodproofed so that below the base flood elevation the structure
is watertight with walls substantially impermeable to the passage
of water;
(2) Have structural components capable of resisting hydrostatic and hydrodynamic
loads and effects of buoyancy; and
(3) Be certified by a registered professional engineer or architect that the design and methods of construction are in accordance with accepted standards of practice for meeting the provisions of this subsection. Such certifications shall be provided to the officials set forth in §
7-135.
C. Openings in Enclosures Below the Lowest Floor. For all new construction
and substantial improvements, fully enclosed areas below the lowest
floor 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 must meet or exceed the following minimum criteria:
(1) 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;
(2) The bottom of all openings shall be no higher than one foot above
grade;
(3) Openings may be equipped with screens, louvers, or other coverings
or devices, provided that they permit the automatic entry and exit
of floodwaters.
D. Manufactured Homes.
(1) Manufactured homes shall be anchored in accordance with §
7-138.
(2) All manufactured homes or those to be substantially improved shall
conform to the following requirements:
(a)
Require that manufactured homes that are placed or substantially
improved on a site 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 or above the base flood elevation and be securely
anchored to an adequately anchored foundation system to resist flotation,
collapse and lateral movement.
(b)
Require that manufactured homes to be placed or substantially improved on sites in existing manufactured home park or subdivisions that are not subject to the provisions in Subsection
D(2)(a) above be elevated so that either the lowest floor of the manufactured home is at or above the base flood elevation, or the manufactured home chassis is supported by reinforced piers or other foundation elements that are no less than 36 inches in height above grade and be securely anchored to an adequately anchored foundation system to resist flotation, collapse, and lateral movement.
(c)
Require that all manufactured homes to be placed within Zone
A on the City's FHBM or FIRM shall be installed using methods and
practices which 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 City anchoring
requirements for resisting wind forces.
E. Recreational Vehicles.
(1) Require that recreational vehicles either be on the site for fewer than 180 consecutive days, be fully licensed and ready for highway use, or meet the permit requirements and elevation and anchoring requirements for manufactured homes as stated in §§
7-138 and
7-140.