[Amended 11-14-2017 by Ord. No. 17-OR-030]
In all areas of special flood hazard, compliance with the applicable
requirements of the Uniform Construction Code (N.J.A.C. 5:23) and
the following standards, whichever is more restrictive, 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 to be placed or substantially improved 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;
and
(4)
For all new construction and substantial improvements, the 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 and other proposed new development.
(1)
All subdivision proposals and other proposed new development shall
be consistent with the need to minimize flood damage;
(2)
All subdivision proposals and other proposed new development 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 and other proposed new development 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 new development which contain at least 50 lots
or five acres (whichever is less); and
E.
Enclosure openings. All new construction and substantial improvements
having 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 must meet or exceed the following minimum
criteria:
(1)
A minimum of two openings in at least two exterior walls of each
enclosed area, 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.
[Amended 11-14-2017 by Ord. No. 17-OR-030]
The following standards are required in all areas of special flood hazard where base flood elevation data have been provided as set forth in § 282-7 or § 282-14B:
A.
Residential construction. New construction and substantial improvement
of any residential structure located in an A or AE Zone shall have
the lowest floor, including basement, together with the attendant
utilities (including all electrical, heating, ventilating, air-conditioning
and other service equipment) and sanitary facilities, elevated at
or above the base flood elevation plus three feet or as required by
ASCE/SEI 24-14, Table 2-1, whichever is more restrictive.
B.
Nonresidential construction. In an area of special flood hazard,
all new construction and substantial improvement of any commercial,
industrial or other nonresidential structure located in an A or AE
Zone shall have the lowest floor, including basement, together with
the attendant utilities and sanitary facilities as well as all electrical,
heating, ventilating, air-conditioning and other service equipment,
either:
(1)
Elevated to or above the base flood elevation plus one foot or as
required by ASCE/SEI 24-14, Table 2-1, whichever is more restrictive;
or
(2)
Floodproofed so that below the base flood level plus one foot, or
as required by ASCE/SEI 24-14, Table 6-1, whichever is more restrictive,
the structure is watertight with walls substantially impermeable to
the passage of water; and
(3)
Have structural components capable of resisting hydrostatic and hydrodynamic
loads and effects of buoyancy; and
(4)
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 Code Official.
C.
Manufactured homes.
(2)
All manufactured homes which are to be placed or substantially improved
within an area of special flood hazard shall:
(a)
Be consistent with the need to minimize flood damage;
(b)
Be constructed to minimize flood damage;
(c)
Have adequate drainage provided to reduce exposure to flood
damage;
(d)
Be elevated on a permanent foundation such that the top of the
lowest floor is at or above the base flood elevation plus three feet
or as required by ASCE/SEI 24-14, Table 2-1, whichever is more restrictive;
and
(e)
Supported by reinforced piers or other foundation elements of
at least equivalent strength that are no less than 36 inches in height
above grade and which are securely anchored to an adequately anchored
foundation system to resist flotation, collapse, and lateral movement.
D.
Floodways. Located within areas of special flood hazard established in § 282-7 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 hydrologic
and hydraulic analyses performed in accordance with standard engineering
practice demonstrates that encroachment shall not result in any increase
in flood levels during the occurrence of the base flood discharge.
(2)
If § 282-18D(1) is satisfied, all new construction and substantial improvement shall comply with all applicable flood hazard reduction provisions of Article VI, Provisions for Flood Hazard Reductions.
(3)
Prohibit the placement of any mobile homes except
in an existing mobile home park or existing mobile home subdivision.
(4)
In all areas of special flood hazard in which base flood elevation
data have been provided and no floodway has been designated, the accumulative
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.
E.
Recreational vehicles. Recreational vehicles shall: either be on the site for fewer than 180 consecutive days; be fully licensed and ready for highway use; or meet the permit requirements of the Federal Emergency Management Agency and the elevation and anchoring requirements for manufactured homes in § 282-17A(2) 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.
