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.
(2)
All manufactured homes shall be anchored to resist flotation, collapse
or lateral movement. Methods of anchoring may include, but are not
to be 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.
Construction materials and methods.
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.
(3)
On-site waste disposal systems shall be located to avoid impairment
to them or contamination from them during flooding.
(4)
Electrical, heating, ventilation, plumbing and air-conditioning equipment
and other service facilities shall be designed and/or located so as
to prevent water from entering or accumulating within the components
during conditions of flooding.
D.
Subdivision proposals.
(1)
All subdivision, site plan or any other land use proposals shall
be consistent with the need to minimize flood damage.
(2)
All subdivision, site plan or any other land use 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, site plan or any other land use 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.
E.
Enclosure openings. For all new construction and substantial improvements,
fully enclosed areas below the lowest floor that are usable solely
for the 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 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 covering
or devices, provided that they permit the automatic entry and exit
of floodwaters.
In all areas of special flood hazard where base flood elevation data has been provided as set forth in § 75-7, Basis for establishing areas of special flood hazard, or in § 75-14B, Use of other base flood and floodway data, the following standards are required:
A.
Residential construction.
(1)
New construction and the substantial improvement of any residential
structure shall have the lowest floor (including basement), together
with the attendant utilities and sanitary facilities, elevated at
least one foot above the base flood elevation.
[Amended 12-13-2011 by Ord. No. 2011-09]
(2)
Within any AO Zone on the municipality's FIRM, all new construction
and substantial improvement of any residential structure shall have
the lowest floor, including basement, elevated above the highest adjacent
grade at least as high as the depth number specified in feet (at least
two feet if no depth number is specified), and require adequate drainage
paths around structures on slopes to guide floodwaters around and
away from proposed structures.
(3)
The provisions of the Land Use Ordinance that affect height of structures
is hereby waived for any homeowner that must, as a result of federal
government act, raise a conforming structure to the base flood elevation
as may be set from time to time by FEMA or any appropriate federal
government agency. This waiver will be of no consequence if for any
reason other than overall height the structure is or becomes a nonconforming
structure.
[Added 12-17-2013 by Ord. No. 2013-11]
B.
Nonresidential construction. In an area of special flood hazard,
all new construction and substantial improvement of any commercial,
industrial or other nonresidential structure shall:
(1)
Have the lowest floor, including basement, together with the attendant
utilities and sanitary facilities:
(a)
Elevated to the level of the base flood elevation; and
(b)
Within any AO Zone on the municipality's DFIRM, have the lowest
floor, including basement, elevated above the highest adjacent grade
at least as high as the depth number specified in feet (at least two
feet if no depth number is specified), and require adequate drainage
paths around structures on slopes to guide floodwaters around and
away from proposed structures;
(2)
Or:
(a)
Be floodproofed so that below the base flood level the structure
is watertight, with walls substantially impermeable to the passage
of water.
(b)
Have structural components capable of resisting hydrostatic
and hydrodynamic loads and effects of buoyancy.
(c)
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 applicable provisions of this subsection. Such certification shall be provided to the official as set forth in § 75-14C(2)(b).
C.
Manufactured homes.
(2)
All manufactured homes to be placed or substantially improved within
an area of special flood hazard shall be elevated on a permanent foundation
such that the top of the lowest floor is at or above the base flood
elevation.
D.
Floodways. Located within areas of special flood hazard established in § 75-7 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:
(1)
Prohibit encroachments, including fill, new construction, substantial
improvements, and other development, unless a technical evaluation
demonstrates that encroachment shall not result in any increase in
flood levels during the occurrence of the base flood discharge.
(3)
In all areas of special flood hazard in which base flood elevation
data has been provided and no floodway has been designated, the cumulative
effect of any proposed development, when combined with all other existing
and anticipated development, shall not increase the water surface
elevation of the base flood more than 0.2 foot at any point.
