The Town Board of the Town of Owego finds that the potential
and/or actual damages from flooding and erosion may be a problem to
the residents of the Town of Owego and that such damages may include
destruction or loss of private and public housing, damage to public
facilities, both publicly and privately owned, and injury to and loss
of human life. In order to minimize the threat of such damages and
to achieve the purposes and objectives hereinafter set forth, this
article is adopted.
It is the purpose of this article to promote the public health,
safety and general welfare and to minimize public and private losses
due to flood conditions in specific areas by provisions designed to:
A. Regulate uses which are dangerous to health, safety and property
due to water or erosion hazards, or which result in damaging increases
in erosion or in flood heights or velocities;
B. Require that uses vulnerable to floods, including facilities which
serve such uses, be protected against flood damage at the time of
initial construction;
C. Control the alteration of natural floodplains, stream channels and
natural protective barriers which are involved in the accommodation
of floodwaters;
D. Control filling, grading, dredging and other development which may
increase erosion or flood damages;
E. Regulate the construction of flood barriers which will unnaturally
divert floodwaters or which may increase flood hazards to other lands;
and
F. Qualify for and maintain participation in the National Flood Insurance
Program.
The objectives of this article are:
A. To protect human life and health;
B. To minimize expenditure of public money for costly flood control
projects;
C. To minimize the need for rescue and relief efforts associated with
flooding and generally undertaken at the expense of the general public;
D. To minimize prolonged business interruptions;
E. To minimize damage to public facilities and utilities such as water
and gas mains, electric, telephone and sewer lines, streets and bridges
located in areas of special flood hazard;
F. To help maintain a stable tax base by providing for the sound use
and development of areas of special flood hazard so as to minimize
future flood blight areas;
G. To provide that developers are notified that property is in an area
of special flood hazard; and
H. To ensure that those who occupy the areas of special flood hazard
assume responsibility for their actions.
Unless specifically defined below, words or phrases used in
this article shall be interpreted so as to give them the meaning they
have in common usage and to give this article its most reasonable
application.
APPEAL
A request for a review of the local administrator's interpretation
of any provision of this article or a request for a variance.
AREA OF SHALLOW FLOODING
A designated AO, AH or VO Zone on a community's Flood Insurance
Rate Map (FIRM) with a one-percent or greater annual chance of flooding
to an average annual depth of one to three feet where a clearly defined
channel does not exist, where the path of flooding is unpredictable
and where velocity flow may be evident. Such flooding is characterized
by ponding or sheet flow.
AREA OF SPECIAL FLOOD HAZARD
Is the land in the floodplain within a community subject
to a one-percent or greater chance of flooding in any given year.
This area may be designated as Zone A, AE, AH, AO, A1-A30, A99, V,
VO, VE or V1-V30. It is also commonly referred to as the base floodplain
or one-hundred-year floodplain. For purposes of this article, the
term "special flood hazard area (SFHA)" is synonymous in meaning with
the phrase "area of special flood hazard."
BASE FLOOD
The flood having a one-percent chance of being equaled or
exceeded in any given year.
BASEMENT
That portion of a building having its floor subgrade (below
ground level) on all sides.
CELLAR
Has the same meaning as "basement."
CRAWL SPACE
An enclosed area beneath the lowest elevated floor, 18 inches
or more in height, which is used to service the underside of the lowest
elevated floor. The elevation of the floor of this enclosed area,
which may be of soil, gravel, concrete or other material, must be
equal to or above the lowest adjacent exterior grade. The enclosed
crawl space area shall be properly vented to allow for the equalization
of hydrostatic forces which would be experienced during periods of
flooding.
DEVELOPMENT
Any man-made change to improved or unimproved real estate,
including but not limited to buildings or other structures, mining,
dredging, filling, paving, excavation or drilling operations or storage
of equipment or materials.
ELEVATED BUILDING
A nonbasement building built, in the case of a building in
Zones A1-A30, AE, A, A99, AO, AH, B, C, X or D, to have the top of
the elevated floor, or in the case of a building in Zones V1-V30,
VE or V, to have the bottom of the lowest horizontal structure member
of the elevated floor, elevated above the ground level by means of
pilings, columns (posts and piers) or shear walls parallel to the
flow of the water and adequately anchored so as not to impair the
structural integrity of the building during a flood of up to the magnitude
of the base flood. In the case of Zones A1-A30, AE, A, A99, AO, AH,
B, C, X or D, elevated building also includes a building elevated
by means of fill or solid foundation perimeter walls with openings
sufficient to facilitate the unimpeded movement of floodwaters. In
the case of Zones V1-V30, VE or V, elevated building also includes
a building otherwise meeting the definition of "elevated building,"
even though the lower area is enclosed by means of breakaway walls
that meet the federal standards.
FLOOD BOUNDARY AND FLOODWAY MAP (FBFM)
An official map of the community published by the Federal
Emergency Management Agency as part of a riverine community's Flood
Insurance Study. The FBFM delineates a regulatory floodway along water
courses studied in detail in the Flood Insurance Study.
FLOOD ELEVATION STUDY
An examination, evaluation and determination of the flood
hazards and, if appropriate, corresponding water surface elevations
or an examination, evaluation and determination of flood-related erosion
hazards.
FLOOD HAZARD BOUNDARY MAP (FHBM)
An official map of a community, issued by the Federal Emergency
Management Agency, where the boundaries of the areas of special flood
hazard have been designated as Zone A but no flood elevations are
provided.
FLOOD INSURANCE RATE MAP (FIRM)
An official map of a community, on which the Federal Emergency
Management Agency has delineated both the areas of special flood hazard
and the risk premium zones applicable to the community.
FLOOD or FLOODING
A.
A general and temporary condition of partial or complete inundation
of normally dry land areas from:
(1)
The overflow of inland or tidal waters; or
(2)
The unusual and rapid accumulation or runoff of surface waters
from any source.
B.
Also means the collapse or subsidence of land along the shore
of a lake or other body of water as a result of erosion or undermining
caused by waves or currents of water exceeding anticipated cyclical
levels or suddenly caused by an unusually high water level in a natural
body of water, accompanied by a severe storm or by an unanticipated
force of nature, such as a flash flood or an abnormal tidal surge
or by some similarly unusual and unforeseeable event which results
in flooding as defined in A(1) above.
FLOODPROOFING
Any combination of structural and nonstructural additions,
changes or adjustments to structures which reduce or eliminate flood
damage to real estate or improved real property, water and sanitary
facilities, structures and their contents.
FLOODWAY
Has the same meaning as "regulatory floodway."
FUNCTIONALLY DEPENDENT USE
A use which cannot perform its intended purpose unless it
is located or carried out in close proximity to water, such as a docking
or port facility necessary for the loading and unloading of cargo
or passengers, shipbuilding and ship repair facilities. The term does
not include long-term storage, manufacturing, sales or service facilities.
HIGHEST ADJACENT GRADE
The highest natural elevation of the ground surface, prior
to construction, next to the proposed walls of a structure.
HISTORIC STRUCTURE
Any structure that is:
A.
Listed individually in the National Register of Historic Places
(a listing maintained by the Department of the Interior) or preliminarily
determined by the Secretary of the Interior as meeting the requirements
for individual listing on the National Register;
B.
Certified or preliminarily determined by the Secretary of the
Interior as contributing to the historical significance of a registered
historic district or a district preliminarily determined by the Secretary
to qualify as a registered historic district;
C.
Individually listed on a state inventory of historic places
in states with historic preservation programs which have been approved
by the Secretary of the Interior; or
D.
Individually listed on a local inventory of historic places
in communities with historic preservation programs that have been
certified either:
(1)
By an approved state program as determined by the Secretary
of the Interior; or
(2)
Directly by the Secretary of the Interior in states without
approved programs.
LOCAL ADMINISTRATOR
Is the person appointed by the community to administer and
implement this article by granting or denying development permits
in accordance with its provisions. This person is often the Building
Inspector, Code Enforcement Officer or employee of an engineering
department.
LOWEST FLOOR
Lowest floor of the lowest enclosed area (including basement
or cellar). An unfinished or flood-resistant enclosure, usable solely
for parking of vehicles, building access or storage in an area other
than a basement area is not considered a building's lowest floor;
provided, that such enclosure is not built so as to render the structure
in violation of the applicable nonelevation design requirements of
this article.
MANUFACTURED HOME
A structure, transportable in one or more sections, which
is built on a permanent chassis and designed to be used with or without
a permanent foundation when connected to the required utilities. The
term does not include a recreational vehicle.
MEAN SEA LEVEL
For purposes of the National Flood Insurance Program, the
National Geodetic Vertical Datum (NGVD) of 1929, the North American
Vertical Datum of 1988 (NAVD 88) or other datum, to which base flood
elevations shown on a community's Flood Insurance Rate Map are referenced.
MOBILE HOME
Has the same meaning as "manufactured home."
NEW CONSTRUCTION
Structures for which the start of construction commenced
on or after the effective date of a floodplain management regulation
adopted by the community and includes any subsequent improvements
to such structure.
PRINCIPALLY ABOVE GROUND
That at least 51% of the actual cash value of the structure,
excluding land value, is above ground.
RECREATIONAL VEHICLE
A vehicle which is:
A.
Built on a single chassis;
B.
Four hundred square feet or less when measured at the largest
horizontal projections;
C.
Designed to be self-propelled or permanently towable by a light-duty
truck; and
D.
Not designed primarily for use as a permanent dwelling but as
temporary living quarters for recreational, camping, travel or seasonal
use.
REGULATORY FLOODWAY
The channel of a river or other watercourse and the adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than a designated height as determined by the Federal Emergency Management Agency in a Flood Insurance Study or by other agencies as provided in §
125-78.8B of this article.
START OF CONSTRUCTION
The date of permit issuance for new construction and substantial
improvements to existing structures, provided that actual start of
construction, repair, reconstruction, rehabilitation, addition placement
or other improvement is within 180 days after the date of issuance.
The actual start of construction means the first placement of permanent
construction of a building (including a manufactured home) on a site,
such as the pouring of a slab or footings, installation of pilings
or construction of columns. Permanent construction does not include
land preparation (such as clearing, excavation, grading or filling)
or the installation of streets or walkways or excavation for a basement,
footings, piers or foundations or the erection of temporary forms
or the installation of accessory buildings such as garages or sheds
not occupied as dwelling units or not part of the main building. For
a substantial improvement, the actual start of construction means
the first alteration of any wall, ceiling, floor or other structural
part of a building, whether or not that alteration affects the external
dimensions of the building.
STRUCTURE
A walled and roofed building, including a gas or liquid storage
tank, that is principally above ground, as well as a manufactured
home.
SUBSTANTIAL DAMAGE
Damage of any origin sustained by a structure whereby the
cost of restoring the structure to its before-damaged condition would
equal or exceed 50% of the market value of the structure before the
damage occurred.
SUBSTANTIAL IMPROVEMENT
Any reconstruction, rehabilitation, addition or other improvement
of a structure, the cost of which equals or exceeds 50% of the market
value of the structure before the start of construction of the improvement.
The term includes structures which have incurred substantial damage,
regardless of the actual repair work performed. The term does not,
however, include either:
A.
Any project for improvement of a structure to correct existing
violations of state or local health, sanitary or safety code specifications
which have been identified by the local code enforcement official
and which are the minimum necessary to assure safe living conditions;
or
B.
Any alteration of an historic structure, provided that the alteration
will not preclude the structure's continued designation as an historic
structure.
VARIANCE
A grant of relief from the requirements of this article which
permits construction or use in a manner that would otherwise be prohibited
by this article.
VIOLATION
The failure of a structure or other development to be fully
compliant with the community's floodplain management regulations.
This article shall apply to all areas of special flood hazard
within the jurisdiction of the Town of Owego, Tioga County.
The invalidity of any section or provision of this article shall
not invalidate any other section or provision thereof.
[Amended 11-3-2021 by L.L. No. 2-2021]
No structure in an area of special flood hazard shall hereafter be constructed, located, extended, converted or altered and no land shall be excavated or filled without full compliance with the terms of this article and any other applicable regulations. Any infraction of the provisions of this article by failure to comply with any of its requirements, including infractions of conditions and safeguards established in connection with conditions of the permit, shall constitute a violation. Any person who violates this article or fails to comply with any of its requirements shall, upon conviction thereof, be subject to a civil penalty of no more than $250. Each day of noncompliance shall be considered a separate offense. Nothing herein contained shall prevent the Town of Owego from taking such other lawful action as necessary to prevent or remedy an infraction. Any structure found not compliant with the requirements of this article for which the developer and/or owner has not applied for and received an approved variance under §§
125-78.14 and
125-78.15 will be declared noncompliant and notification sent to the Federal Emergency Management Agency.
The degree of flood protection required by this article is considered
reasonable for regulatory purposes and is based on scientific and
engineering considerations. Larger floods can and will occur on rare
occasions. Flood heights may be increased by man-made or natural causes.
This article does not imply that land outside the area of special
flood hazards or uses permitted within such areas will be free from
flooding or flood damages. This article shall not create liability
on the part of the Town of Owego, any officer or employee thereof
or the Federal Emergency Management Agency, for any flood damages
that result from reliance on this article or any administrative decision
lawfully made thereunder.
The Town of Owego Planning and Zoning Administrator is hereby
appointed local administrator to administer and implement this article
by granting or denying floodplain development permits in accordance
with its provisions.
The applicant shall provide at least the following information
as appropriate. Additional information may be required on the permit
application form.
A. The proposed elevation, in relation to mean sea level, of the lowest
floor (including basement or cellar) of any new or substantially improved
structure to be located in Zones A1-A30, AE or AH, or Zone A if base
flood elevation data are available. Upon completion of the lowest
floor, the permittee shall submit to the local administrator the as-built
elevation, certified by a licensed professional engineer or surveyor.
B. The proposed elevation, in relation to mean sea level, to which any
new or substantially improved nonresidential structure will be floodproofed.
Upon completion of the floodproofed portion of the structure, the
permittee shall submit to the local administrator the as-built floodproofed
elevation, certified by a professional engineer or surveyor.
C. A certificate from a licensed professional engineer or architect that any utility floodproofing will meet the criteria in §
125-78.10C, Utilities.
D. A certificate from a licensed professional engineer or architect that any nonresidential floodproofed structure will meet the floodproofing criteria in §
125-78.12, Nonresidential structures.
E. A description of the extent to which any watercourse will be altered or relocated as a result of proposed development. Computations by a licensed professional engineer must be submitted that demonstrate that the altered or relocated segment will provide equal or greater conveyance than the original stream segment. The applicant must submit any maps, computations or other material required by the Federal Emergency Management Agency (FEMA) to revise the documents enumerated in §
125-78, when notified by the local administrator and must pay any fees or other costs assessed by FEMA for this purpose. The applicant must also provide assurances that the conveyance capacity of the altered or relocated stream segment will be maintained.
F. A technical analysis, by a licensed professional engineer, if required
by the local administrator, which shows whether proposed development
to be located in an area of special flood hazard may result in physical
damage to any other property.
G. In Zone A, when no base flood elevation data are available from other
sources, base flood elevation data shall be provided by the permit
applicant for subdivision proposals and other proposed developments
(including proposals for manufactured home and recreational vehicle
parks and subdivisions) that are greater than either 50 lots or five
acres.
Duties of the local administrator shall include, but not be
limited to the following:
A. Permit application review. The local administrator shall conduct
the following permit application review before issuing a floodplain
development permit:
(1)
Review all applications for completeness, particularly with the requirements of §
125-78.7, Application for permit, and for compliance with the provisions and standards of this article.
(2)
Review subdivision and other proposed new development, including manufactured home parks, to determine whether proposed building sites will be reasonably safe from flooding. If a proposed building site is located in an area of special flood hazard, all new construction and substantial improvements shall meet the applicable standards of §§
125-78.9 through
125-78.13 and, in particular, §
125-78.9A Subdivision proposals.
(3)
Determine whether any proposed development in an area of special flood hazard may result in physical damage to any other property (e.g., stream bank erosion and increased flood velocities). The local administrator may require the applicant to submit additional technical analyses and data necessary to complete the determination. If the proposed development may result in physical damage to any other property or fails to meet the requirements of §§
125-78.9 through
125-78.13, no permit shall be issued. The applicant may revise the application to include measures that mitigate or eliminate the adverse effects and resubmit the application.
(4)
Determine that all necessary permits have been received from
those governmental agencies from which approval is required by state
or federal law.
B. Use of other flood data.
(1)
When the Federal Emergency Management Agency has designated areas of special flood hazard on the community's Flood Insurance Rate Map (FIRM) but has neither produced water surface elevation data (these areas are designated Zone A or V on the FIRM) nor identified a floodway, the local administrator shall obtain, review and reasonably utilize any base flood elevation and floodway data available from a federal, state or other source, including data developed pursuant to §
125-78.7G, as criteria for requiring that new construction, substantial improvements or other proposed development meet the requirements of this article.
(2)
When base flood elevation data are not available, the local
administrator may use flood information from any other authoritative
source, such as historical data, to establish flood elevations within
the areas of special flood hazard for the purposes of this article.
C. Alteration of watercourses. The local administrator shall:
(1)
Notify adjacent communities and the New York State Department
of Environmental Conservation prior to permitting any alteration or
relocation of a watercourse and submittal of evidence of such notification
to the Regional Administrator, Region II, Federal Emergency Management
Agency.
(2)
Determine that the permit holder has provided for maintenance
within the altered or relocated portion of said watercourse so that
the flood-carrying capacity is not diminished.
D. Construction stage. The local administrator shall:
(1)
In Zones A1-A30, AE and AH and also Zone A, if base flood elevation
data are available, upon placement of the lowest floor or completion
of floodproofing of a new or substantially improved structure, obtain
from the permit holder a certification of the as-built elevation of
the lowest floor or floodproofed elevation, in relation to mean sea
level. The certificate shall be prepared by or under the direct supervision
of a licensed land surveyor or professional engineer and certified
by the same. For manufactured homes, the permit holder shall submit
the certificate of elevation upon placement of the structure on the
site. A certificate of elevation must also be submitted for a recreational
vehicle if it remains on a site for 180 consecutive days or longer
(unless it is fully licensed and ready for highway use).
(2)
Any further work undertaken prior to submission and approval
of the certification shall be at the permit holder's risk. The local
administrator shall review all data submitted. Deficiencies detected
shall be cause to issue a stop-work order for the project unless immediately
corrected.
E. Inspections. The local administrator and/or the developer's engineer
or architect shall make periodic inspections at appropriate times
throughout the period of construction in order to monitor compliance
with permit conditions and enable said inspector to certify, if requested,
that the development is in compliance with the requirements of the
floodplain development permit and/or any variance provisions.
F. Stop-work orders.
(1)
The local administrator shall issue, or cause to be issued, a stop-work order for any floodplain development found ongoing without a development permit. Disregard of a stop-work order shall subject the violator to the penalties described in §
125-78.3 of this article.
(2)
The local administrator shall issue, or cause to be issued, a stop-work order for any floodplain development found noncompliant with the provisions of this article and/or the conditions of the development permit. Disregard of a stop-work order shall subject the violator to the penalties described in §
125-78.3 of this article.
G. Certificate of compliance.
(1)
In areas of special flood hazard, as determined by documents enumerated in §
125-78, it shall be unlawful to occupy or to permit the use or occupancy of any building or premises, or both, or part thereof hereafter created, erected, changed, converted or wholly or partly altered or enlarged in its use or structure until a certificate of compliance has been issued by the local administrator stating that the building or land conforms to the requirements of this article.
(2)
A certificate of compliance shall be issued by the local administrator
upon satisfactory completion of all development in areas of special
flood hazard.
(3)
Issuance of the certificate shall be based upon the inspections conducted as prescribed in §
125-78.8E, Inspections, and/or any certified elevations, hydraulic data, floodproofing, anchoring requirements or encroachment analyses which may have been required as a condition of the approved permit.
H. Information to be retained. The local administrator shall retain,
and make available for inspection, copies of the following:
(1)
Floodplain development permits and certificates of compliance;
(2)
Certifications of as-built lowest floor elevations of structures, required pursuant to §
125-78.8D(1) and
(2), and whether or not the structures contain a basement;
(3)
Floodproofing certificates required pursuant to §
125-78.8D(1), and whether or not the structures contain a basement;
(4)
Variances issued pursuant to §
125-78.14, Appeals board for variance procedures, and §
125-78.15; and
(5)
Notices required under §
125-78.8C, Alteration of watercourses.
The following standards apply to new development, including new and substantially improved structures, in the areas of special flood hazard shown on the Flood Insurance Rate Map designated in §
125-78:
A. Subdivision proposals. The following standards apply to all new subdivision
proposals and other proposed development in areas of special flood
hazard (including proposals for manufactured home and recreational
vehicle parks and subdivisions):
(1)
Proposals shall be consistent with the need to minimize flood
damage;
(2)
Public utilities and facilities such as sewer, gas, electrical
and water systems shall be located and constructed so as to minimize
flood damage; and
(3)
Adequate drainage shall be provided to reduce exposure to flood
damage.
B. Encroachments.
(1)
Within Zones A1-A30 and AE, on streams without a regulatory
floodway, no new construction, substantial improvements or other development
(including fill) shall be permitted unless:
(a)
The applicant demonstrates that the cumulative effect of the
proposed development, when combined with all other existing and anticipated
development, will not increase the water surface elevation of the
base flood more than one foot at any location; or
(b)
The Town of Owego agrees to apply to the Federal Emergency Management
Agency (FEMA) for a conditional FIRM revision, FEMA approval is received
and the applicant provides all necessary data, analyses and mapping
and reimburses the Town of Owego for all fees and other costs in relation
to the application. The applicant must also provide all data, analyses
and mapping and reimburse the Town of Owego for all costs related
to the final map revision.
(2)
On streams with a regulatory floodway, as shown on the Flood Boundary and Floodway Map or the Flood Insurance Rate Map adopted in §
125-78, no new construction, substantial improvements or other development in the floodway (including fill) shall be permitted unless:
(a)
A technical evaluation by a licensed professional engineer shows
that such an encroachment shall not result in any increase in flood
levels during occurrence of the base flood; or
(b)
The Town of Owego agrees to apply to the Federal Emergency Management
Agency (FEMA) for a conditional FIRM and floodway revision, FEMA approval
is received and the applicant provides all necessary data, analyses
and mapping and reimburses the Town of Owego for all fees and other
costs in relation to the application. The applicant must also provide
all data, analyses and mapping and reimburse the Town of Owego for
all costs related to the final map revisions.
The following standards apply to new development, including new and substantially improved structures, in the areas of special flood hazard shown on the Flood Insurance Rate Map designated in §
125-78.
A. Anchoring. New structures and substantial improvement to structures
in areas of special flood hazard shall be anchored to prevent flotation,
collapse or lateral movement during the base flood. This requirement
is in addition to applicable state and local anchoring requirements
for resisting wind forces.
B. Construction materials and methods.
(1)
New construction and substantial improvements to structures
shall be constructed with materials and utility equipment resistant
to flood damage.
(2)
New construction and substantial improvements to structures
shall be constructed using methods and practices that minimize flood
damage.
(3)
Enclosed areas.
(a)
For enclosed areas below the lowest floor of a structure within
Zones A1-A30, AE or AH and also Zone A if base flood elevation data
are available, new and substantially improved structures shall have
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, 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 licensed professional engineer or architect
or 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; and
[2] The bottom of all such openings no higher than
one foot above the lowest adjacent finished grade.
(b)
Openings may be equipped with louvers, valves, screens or other
coverings or devices, provided they permit the automatic entry and
exit of floodwaters. Enclosed areas subgrade on all sides are considered
basements and are not permitted.
C. Utilities.
(1)
New and replacement electrical equipment, heating, ventilating,
air-conditioning, plumbing connections and other service equipment
shall be located at least two feet above the base flood elevation
or be designed to prevent water from entering and accumulating within
the components during a flood and to resist hydrostatic and hydrodynamic
loads and stresses. Electrical wiring and outlets, switches, junction
boxes and panels shall also be elevated or designed to prevent water
from entering and accumulating within the components unless they conform
to the appropriate provisions of the electrical part of the Building
Code of New York State or the Residential Code of New York State for
location of such items in wet locations;
(2)
New and replacement water supply systems shall be designed to
minimize or eliminate infiltration of floodwaters into the system;
(3)
New and replacement sanitary sewage systems shall be designed
to minimize or eliminate infiltration of floodwaters. Sanitary sewer
and storm drainage systems for buildings that have openings below
the base flood elevation shall be provided with automatic backflow
valves or other automatic backflow devices that are installed in each
discharge line passing through a building's exterior wall; and
(4)
On-site waste disposal systems shall be located to avoid impairment
to them or contamination from them during flooding.
The following standards apply to new and substantially improved commercial, industrial and other nonresidential structures located in areas of special flood hazard, in addition to the requirements in §
125-78.9A, Subdivision proposals, and §
125-78.9B, Encroachments, and §
125-78.10, Standards for all structures:
A. Within Zones A1-A30, AE and AH and also Zone A if base flood elevation
data are available, new construction and substantial improvements
of any nonresidential structure shall either:
(1)
Have the lowest floor (including basement) or cellar, elevated
to or above two feet above the base flood elevation; or
(2)
Be floodproofed so that the structure is watertight below two
feet above the base flood elevation, including attendant utility and
sanitary facilities, with walls substantially impermeable to the passage
of water. All structural components located below the base flood level
must be capable of resisting hydrostatic and hydrodynamic loads and
the effects of buoyancy.
B. Within Zone AO, new construction and substantial improvement of nonresidential
structures shall:
(1)
Have the lowest floor (including basement) elevated above the
highest adjacent grade at least as high as two feet above the depth
number specified in feet on the community's FIRM (at least two feet
if no depth number is specified); or
(2)
Together with attendant utility and sanitary facilities, be completely floodproofed to that level to meet the floodproofing standard specified in §
125-78.12A(2).
C. If the structure is to be floodproofed, a licensed professional engineer or architect shall develop and/or review structural design, specifications and plans for construction. A floodproofing certificate or other certification shall be provided to the local administrator that certifies the design and methods of construction are in accordance with accepted standards of practice for meeting the provisions of §
125-78.12A(2), including the specific elevation (in relation to mean sea level) to which the structure is to be floodproofed.
D. Within Zone AH and AO, adequate drainage paths are required to guide
floodwaters around and away from proposed structures on slopes.
E. Within Zone A, when no base flood elevation data are available, the
lowest floor (including basement) shall be elevated at least three
feet above the highest adjacent grade.
The following standards, in addition to the standards in §
125-78.9, General construction standards, and §
125-78.10, Standards for all structures, apply, as indicated, in areas of special flood hazard to manufactured homes and to recreational vehicles which are located in areas of special flood hazard:
A. Recreational vehicles.
(1)
Recreational vehicles placed on sites within Zones A1-A30, AE
and AH shall either:
(a)
Be on site fewer than 180 consecutive days;
(b)
Be fully licensed and ready for highway use; or
(2)
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.
B. A manufactured home that is placed or substantially improved in Zones
A1-A30, AE and AH shall be elevated on a permanent foundation such
that the lowest floor is elevated to or above two feet above the base
flood elevation and is securely anchored to an adequately anchored
foundation system to resist flotation, collapse and lateral movements.
C. Within Zone A, when no base flood elevation data are available, new
and substantially improved manufactured homes shall be elevated such
that the manufactured home chassis is 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 are securely
anchored to an adequately anchored foundation system to resist flotation,
collapse or lateral movement.
D. Within Zone AO, the floor shall be elevated above the highest adjacent grade at least as high as the depth number specified on the Flood Insurance Rate Map enumerated in §
125-78 (at least two feet if no depth number is specified).