In all areas of special fixed hazards 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.
(2) All mobile homes shall be anchored to resist flotation, collapse
or lateral movement by providing over-the-top and frame ties to ground
anchors. Specific requirements shall be that:
(a)
Over-the-top ties be provided at each of the four corners of
the mobile home, with two additional ties per side at intermediate
locations, with mobile 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 mobile 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 mobile 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.
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; and
(4) Base flood elevation data shall be provided for subdivision proposals
and other proposed developments which contain at least 50 lots or
five acres (whichever is less).
In all areas of special flood hazards where base flood elevation data have been provided as set forth in §
231-8, Basis for establishing areas of special flood hazard, or §
231-15B, Use of other base flood data, the following provisions 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 base flood elevation.
B. Nonresidential construction. New construction and substantial improvements
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 level 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 standards of this subsection are satisfied. Such certifications shall be provided to the official as set forth in §
231-15C(2).
C. Mobile homes.
(1) Mobile homes shall be anchored in accordance with §
231-17A(2).
(2) For new mobile home parks and mobile home subdivisions; expansions
to existing mobile home parks and mobile home subdivisions; for existing
mobile home parks and mobile home subdivisions where the repair, reconstruction
or improvement of the streets, utilities and pads equals or exceeds
50% of the value of the streets, utilities and pads before the repair,
reconstruction or improvement has commenced; and for mobile homes
not placed in a mobile home park or mobile home subdivision, require
that:
(a)
Stands or lots are elevated on compacted fill or on pilings
so that the lowest floor of the mobile home will be at or above the
base flood level;
(b)
Adequate surface drainage and access for a hauler are provided;
and
(c)
In the instance of elevation on pilings, that:
[1]
Lots are large enough to permit steps;
[2]
Piling foundations are placed in stable soil no more than 10
feet apart; and
[3]
Reinforcement is provided for pilings more than six feet above
the ground level.
(3) No mobile home shall be placed in a floodway, except in an existing
mobile home park or existing mobile home subdivision.
Located within areas of special flood hazard areas established in §
231-8 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 apply:
A. Prohibit encroachments, including fill, new construction, substantial
improvements, and other development unless certification by a registered
professional engineer or architect is provided demonstrating that
encroachments shall not result in any increase in flood levels during
the occurrence of the base flood discharge.
B. If Subsection
A is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of Article
V, Provisions for Flood Hazard Reduction.
C. Prohibit the placement of any mobile homes, except in an existing
mobile home park or existing mobile home subdivision.