The Town Board of the Town of Clifton Park finds
that the potential and/or actual damages from flooding and erosion
may be a problem to the residents of the Town of Clifton Park 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 chapter is adopted.
It is the purpose of this chapter 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 and maintain for participation in the National
Flood Insurance Program.
The objectives of this chapter are to:
A. Protect human life and health.
B. Minimize expenditure of public money for costly flood
control projects.
C. Minimize the need for rescue and relief efforts associated
with flooding and generally undertaken at the expense of the general
public.
D. Minimize prolonged business interruptions.
E. Minimize damage to public facilities and utilities
such as water and gas mains, electric, telephone, sewer lines, streets
and bridges located in areas of special flood hazard.
F. 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. Provide that developers are notified that property
is in an area of special flood hazard.
H. Ensure that those who occupy the areas of special
flood hazard assume responsibility for their actions.
Unless specifically defined below, words and
phrases used in this chapter shall be interpreted so as to give them
the meaning they have in common usage and to give this chapter its
most reasonable application.
APPEAL
A request for a review of the local administrator's interpretation
of any provision of this chapter or a request for a variance.
AREA OF SHALLOW FLOOD
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 patch 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
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.
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."
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.
EXISTING MANUFACTURED HOME PARK OR SUBDIVISION
A manufactured home park or subdivision for which the construction
of facilities for servicing the lots on which the manufactured homes
are to be affixed (including, at a minimum, the installation of utilities,
the construction of streets, and either final site grading or the
pouring of concrete pads) is complete before the effective date of
the floodplain management regulations adopted by the community.
EXPANSION TO AN EXISTING MANUFACTURED HOME PARK OR SUBDIVISION
The preparation of additional sites by the construction of
facilities for servicing the lots on which the manufactured homes
are to be affixed (including the installation of utilities, the construction
of streets and either final site grading or the pouring of concrete
pads).
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 watercourses
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 the overflow
of inland or tidal waters; or the unusual and rapid accumulation or
runoff of surface waters from any source.
B.
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 Subsection
A 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 by an approved state program as determined
by the Secretary of the Interior or directly by the Secretary of the
Interior in states without approved programs.
LOCAL ADMINISTRATOR
The person appointed by the community to administer and implement
this chapter by granting or denying development permits in accordance
with its provisions. This person is often the Code Enforcement Officer,
Building Inspector, Stormwater Management Officer, or employee of
an engineering department.
[Amended 12-12-2022 by L.L. No. 3-2022]
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 chapter.
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 or other datum, to
which base flood elevations shown on a community 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.
NEW MANUFACTURED HOME PARK OR SUBDIVISION
A manufactured home park or subdivision for which the construction
of facilities for servicing the lots on which the manufactured homes
are to be affixed (including at a minimum, the installation of utilities,
the construction of streets, and either final site grading or the
pouring of concrete pads) is completed on or after the effective date
of floodplain management regulations adopted by a community.
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 §
119-14 of this chapter.
START OF CONSTRUCTION
Includes substantial improvement and means the initiation,
excluding planning and design, of any phase of a project, physical
alteration of the property, and shall include land preparation, such
as clearing, grading and filling; installation of streets and/or walkways;
excavation for a basement, footings, piers or foundations or the erection
of temporary forms. It also includes the placement and/or installation
on the property of accessory buildings (garages, sheds), storage trailers
and building materials. For manufactured homes the "actual start"
means affixing of the manufactured home to its permanent site.
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 a historic structure, provided
that the alteration will not preclude the structure's continued designation
as a historic structure.
VARIANCE
A grant of relief from the requirements of this chapter which
permits construction or use in a manner that would otherwise be prohibited
by this chapter.
This chapter shall apply to all areas of special
flood hazard within the jurisdiction of the Town of Clifton Park,
Saratoga County, New York.
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 chapter and any other applicable regulations. Any infraction of the provisions of this chapter 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 chapter or fails to comply with any of its requirements shall, upon conviction thereof, be fined no more than $250 or imprisoned for not more than 15 days or both. Each day of noncompliance shall be considered a separate offense. Nothing herein contained shall prevent the Town of Clifton Park from taking such other lawful action as necessary to prevent or remedy an infraction. Any structure found not compliant with the requirements of this chapter for which the developer and/or owner has not applied for and received an approved variance under §§
119-27 and
119-28 will be declared noncompliant and notification sent to the Federal Emergency Management Agency.
The degree of flood protection required by this
chapter 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 chapter 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 chapter shall not
create liability on the part of the Town of Clifton Park, any officer
or employee thereof or the Federal Emergency Management Agency, for
any flood damages that result from reliance on this chapter or any
administrative decision lawfully made thereunder.
[Amended 12-12-2022 by L.L. No. 3-2022]
The Town Board shall appoint a local administrator from the list of eligible titles as defined in §
119-4 to administer and implement this chapter by granting or denying floodplain development permits in accordance with its provisions.
A floodplain development permit is hereby established for all construction and other development to be undertaken in areas of special flood hazard in this community for the purpose of protecting its citizens from increased flood hazards and insuring that new development is constructed in a manner that minimizes its exposure to flooding. It shall be unlawful to undertake any development in an area of special flood hazard, as shown on the Flood Insurance Rate Map enumerated in §
119-6 without a valid floodplain development permit. Application for a permit shall be made on forms furnished by the local administrator and may include, but not be limited to: plans, in duplicate, drawn to scale and showing: the nature, location, dimensions and elevations of the area in question; existing or proposed structures, fill, storage of materials, drainage facilities and the location of the foregoing.
The applicant shall provide 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 §
119-23, Utilities.
D. A certificate from a licensed professional engineer or architect that any nonresidential floodproofed structure will meet the floodproofing criteria in §
119-25, 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 §
119-6 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 §
119-12, Application for permits, and for compliance with the provisions and standards of this chapter.
(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 §
119-20, Construction standards and, in particular, §
119-20A, 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 §
119-20, Construction standards, 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.
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.
The local administrator shall retain and make
available for inspection, copies of the following:
A. Floodplain development permits and certificates of
compliance.
B. Certifications of as-built lowest floor elevations of structures, required pursuant to §
119-15 and whether or not the structures contain a basement.
C. Floodproofing certificates required pursuant to §
119-15A and whether or not the structures contain a basement.
E. Notices required under §
119-14B, 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
herein.
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 applicant 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 Clifton Park
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 Clifton Park 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 §
119-6 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 applicant 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 Clifton
Park 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 Clifton Park for all costs related to the final
map revisions.
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.
The following standards, in addition to the standards in §
119-20A, Subdivision proposals, §
119-20B, Encroachments, and §
119-21, Anchoring of structures, apply to structures located in areas of special flood hazard as indicated:
A. Within Zones A1-A30, AE and AH and also Zone A if
base flood elevation data are available, new construction and substantial
improvements shall have the lowest floor (including basement) elevated
to or above the base flood level.
B. Within Zone A, when no base flood elevation data are
available, new and substantially improved structures shall have the
lowest floor (including basement) elevated at least three feet above
the highest adjacent grade.
C. Within Zone AO, new and substantially improved structures shall have the lowest floor (including basement) elevated above the highest adjacent grade at least as high as the depth number specified in feet on the community's Flood Insurance Rate Map enumerated in §
119-6 (at least two feet if no depth number is specified).
D. Within Zones AH and AO, adequate drainage paths are
required to guide floodwaters around and away from proposed structures
on slopes.
The following standards apply to new and substantially improved commercial, industrial and other nonresidential structures, in addition to the requirements in §
119-20A, Subdivision proposals, §
119-20B, Encroachments, and §
119-21, Anchoring of 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, together with attendant
utility and sanitary facilities, shall either:
(1) Have the lowest floor, including basement or cellar,
elevated to or above the base flood elevation; or
(2) Be floodproofed so that the structure is watertight
below the base flood level 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 improvements
of nonresidential structures shall:
(1) Have the lowest floor (including basement) elevated
above the highest adjacent grade at least as high as 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 Subsection
A(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 Subsection
A(2), including the specific elevation (in relation to mean sea level) to which the structure is to be floodproofed.
D. Within Zones AH and AO, adequate drainage paths are
required to guide floodwaters around the 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 §§
119-20, Construction standards, and 119-21, Anchoring of 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 days;
(b)
Be fully licensed and ready for highway use;
or
(c)
Meet the requirements for manufactured homes in Subsection
B(3) and
(4).
(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. Manufactured homes.
(1) A manufactured home that is placed or substantially
improved in Zones A1-A30, AE and AH that is on a site either outside
of an existing manufactured home park or subdivision as herein defined;
in a new manufactured home park or subdivision as herein defined;
in an expansion to an existing manufactured home park or subdivision
as herein defined; or in an existing manufactured home park or subdivision
as herein defined on which a manufactured home has incurred substantial
damage as the result of a flood; shall be elevated on a permanent
foundation such that the lowest floor is elevated to or above the
base flood elevation and is securely anchored to an adequately anchored
foundation system to resist flotation, collapse and lateral movement.
Elevation on piers consisting of dry stacked blocks is prohibited.
Methods of anchoring may include, but are not limited to, use of over-the-top
or frame ties to ground anchors.
(2) A manufactured home to be placed or substantially
improved in Zones A1-A30, AE and AH in an existing manufactured home
park or subdivision that is not to be placed on a site on which a
manufactured home has incurred substantial damage shall be:
(a)
Elevated in a manner such as required in Subsection
B(1); or
(b)
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 the lowest adjacent grade and are securely anchored to an adequately
anchored foundation system to resist flotation, collapse or lateral
movement. Elevation on piers consisting of dry stacked blocks is prohibited.
(3) 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 the lowest
adjacent grade and are securely anchored to an adequately anchored
foundation system to resist flotation, collapse or lateral movement.
Elevation on piers consisting of dry stacked blocks is prohibited.
(4) Within Zone AO, the floor shall be elevated above the highest adjacent grade at least as high as the depth number specified in the Flood Insurance Rate Map enumerated in §
119-6 (at least two feet if no depth number is specified). Elevation on piers consisting of dry stacked blocks is prohibited.