Ordinance 1986-022 Adopts Coastal Building Zone Building Code 1985 Edition as AmendedORDINANCE N0. 22-86
AN ORDINANCE OF THE VILLAGE OF NORTH PALM BEACH, FLORIDA, ADOPTING
A COASTAL BUILDING ZONE BUILDING CODE AS REQUIRED BY SECTIONS 161.52 THROUGH
161.58, FLORIDA STATUTES, THE COASTAL ZONE PROTECTION ACT OF 1985, AS
AMENDED, ADOPTING THE REQUIREMENTS ESTABLISHED IN SECTION 161.55, FLORIDA
STATUTES, AND PROVIDING AN EFFECTIVE DATE FOR THIS ORDINANCE.
BE IT ORDAINED BY THE VILLAGE COUNCIL OF NORTH PALM BEACH,
FLORIDA:
Section 1. Chapter 6, Article VII, of the Village of North Palm
Beach Code is hereby amended to read:
Article VII. Coastal Construction Code.
Section 6-151. TITLE.
The provisions contained herein shall constitute the Coastal
Construction Code for construction within the coastal building zone and
coastal barrier islands in the Village and shall be referred to as the
"Coastal Code".
Section 6-152. PURPOSE.
General: The purpose of the Coastal Code is to provide minimum
standards for the design and construction of buildings and structures to
reduce the harmful effects of hurricanes and other severe storms occurring
along the coastal area of the Village which front on the Atlantic Ocean.
These standards are intended to specifically address design features which
affect the structural stability of the beach, dunes, and topography of
adjacent properties. The Coastal Code is site specific to the coastal
building zone as defined herein and is not applicable to other locations.
In the event of a conflict between this chapter and other chapters of this
code, the requirements resulting in the more restrictive design shall apply
No provisions in this chapter shall be construed to permit any construction
in arty area prohibited by city, county, state or federal regulation.
Section 6-153. SCOPE.
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(a) Applicability: The requirements of this Coastal Code shall
apply to the following types of construction in the coastal building zone
and on coastal barrier islands in the Village.
(1) The new construction of, or substantial improvement to major
structures, nonhabitable major structures, and minor structures as defined
herein.
(2) Construction which would change or otherwise have the potential
for substantial impact on coastal zones (i. e. excavation, grading, paving).
(3) Construction located partially within the coastal building
zone.
(4) Reconstruction, redevelopment or repair of a damaged
structure from any cause which meets the definition of substantial improvement
as defined herein.
(b) Exceptions: The requirements of the coastal code shall not
apply to the following:
(1) .Minor work in the nature of normal beach cleaning and debris
removal.
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(2) Structures in existence prior to the effective date of the
code, except for substantial improvements as defined herein.
(3) Construction for which a valid and unexpired building permit
was issued prior to the effective date of this code.
(4) Construction extending seaward of the seasonal high-water line '
which is regulated by the provisions of section 161.041, Florida Statutes
(i. e. groins, jetties, moles, breakwaters, seawalls, piers, revetments,
beach nourishment, inlet dredging, etc.).
(5) Construction of non-habitable major structures as defined
herein, except for the requirements of Section 6-155(2).
(6) Construction of minor structures as defined herein, except
for the requirements of Section 6-155(3).
(7) Structures listed in the National Register of Flistoric Places
or the State Inventory of Flistoric Places.
(B) Construction for improvement of a major structure to comply
with existing state or local health, sanitary, or safety code specifications
which are solely necessary to assure safe living conditions.
(c) Application for Permits: Applications for building permits
for construction in the coastal building zone and on coastal barrier islands,
if not of normal or usual design, may be required by the Euilding Official to
be certified by an architect or professional engineer registered in the State
of Florida. Such certifications shall state that the design plans and
specifications for the construction are in compliance with the criteria
established by this Coastal Code.
Section 6-154. DEFINITIONS.
The following terms are defined for general use in the Coastal Code:
"Beach" means the zone of unconsolidated material that extends
landward from the mean low water line to the place where there is marked
change in material or physiographic form, or to the line of permanent
vegetation, usually the effective limit of storm waves. "Beach" is
alternatively termed "shore".
"Breakaway wall" or "frangible wall" means a partition independent
of supporting structural members that will withstand design wind forces,
but which will fail under hydrodynamic, wave, and runup forces associated
with the design storm surge. Under such conditions, the wall shall fail in
a manner such that it breaks up into components which minimize the potential
for damage to life or adjacent property. It shall be a characteristic of a
breakaway or frangible wall that it shall have a horizontal design loading
resistance of no less than 10 nor more than 20 pounds per square foot.
"Building Support Structure" means arty structure which supports
floor, wall or column loads, and transmits them to the foundation. The
' i term shall include beams, grade beams, or joists, and includes the lowest
horizontal structural member exclusive of piles, columns, or footings.
"Coastal Barrier Islands" means geological surface features above
mean high water which are completely surrounded by marine waters, that
front upon the open waters of the Atlantic Ocean and are composed of quartz
sands, clays, limestone, oolites, rock, coral, coquina, sediment, or other
material, including spoil disposal. Mainland areas which were separated
from the mainland by artificial channelization for the purpose of assisting
marine commerce shall not be considered coastal barrier islands.
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"Coastal Building Zone" means the land area between the seasonal
high-water line and a line 5000 feet landward from the coastal construction
control line or the entire island, whichever is less.
"Coastal Construction Control Line" means the landward extent of
that portion of the beach-dune system which is subject to severe fluctua-
tions based upon a 100-year storm surge, storm waves, or other predictable
weather conditions as established by the Department of Natural Resources
in accordance with section 161.053, Florida Statutes.
"Construction" means the building of or substantial improvement to
any structure or the clearing, filling, or excavation of any land. It
shall also mean any alterations in the size or use of arty existing structure
or the appearance of any land. l4hen appropriate to the context, "construction"
refers to the act of construction or the result of construction.
"Dune" means a mound or ridge of loose sediments, usually sand-
sized, deposited by natural or artificial means, which lies landward of the
beach.
"Major Structure" includes but is not limited to residential
buildings including mobile homes, commercial, institutional, industrial, and
other construction having the potehtial for substantial impact on coastal
zones.
"t4ean High-water line" means the intersection of the tidal plane
of mean high water with the shore. Mean high water is the average height
of high waters over a 19 year period.
"Minor Structure" includes but is not limited to pile-supported,
elevated dune and beach walkover structures; beach access ramps and walkways;
stairways; pile-supported elevated viewing platforms, gazebos, and boardwalks;
lifeguard support stands; public and private bathhouses; sidewalks, driveways,i
parking areas, shuffleboard courts, tennis courts, handball courts, racquet-
ball courts, and other uncovered paved areas; earth retaining walls; sand
fences, privacy fences, ornamental walls, ornamental garden structures,
aviaries, and other ornamental construction. It shall be a characteristic
of minor structures that they are considered to be expendable under design
wind, wave and storm forces.
"Nonhabitable Major Structure" includes but is not limited to
swimming pools; parking garages; pipelines; piers; canals, lakes, ditches,
drainage structures, and other water retention structures; water and sewage
treatment plants; electrical power plants, transmission and distribution
lines, transformer pads, vaults, and substations; roads, bridges, streets,
and highways; and underground storage tanks.
"NGVD" means National Geodetic Vertical Datum - a geodetic datum
established by the National Ocean Service and frequently referred to as the
1929 Mean Sea Level Datum.
"One Hundred Year Storm" or "100-Year Storm" means a shore incident '
hurricane or any other storm 4rith accompanying wind, wave, and storm surge
intensity having a one percent chance of being equaled or exceeded in any
given year, during any 100-year interval.
"Seasonal high-water line" means the line formed by the intersection
of the rising shore and the elevation of 150 percent of the local mean tidal
range above mean high water.
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"State Minimum Building Code" means the building code adopted by a
municipality or county pursuant to the requirements of Section 553.73, Florida
Statutes.
"Substantial Improvement" means any repair, reconstruction, or
improvement of a structure, the cost of which equals or exceeds a cumulative
total of 50 percent of the market value of the structure either:
(a) Before the repair or improvement is started; or
(b) If the structure has been damaged and is being restored,
before the damage occurred.
For the purposes of this definition, "substantial improvement" is considered
to occur when the first alteration of arty wall, ceiling, floor, or other
structural part of the building commences, whether or not that alteration
affects the external dimensions of the structure. The term does not, however,
include either any project for improvement of a structure to comply with
existing state or local health, sanitary, or safety code specifications which
are solely necessary to assure safe living conditions; or any alteration of a
structure listed on the National Register of Historic Places or the State
Inventory of Historic Places.
Section 6-155. COASTAL CONSTRUCTION REQUIREMENTS
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General: Construction within the coastal building zone and on
coastal barrier islands shall meet the requirements of this chapter. All
structures shall be designed so as to minimize damage to life, property, and
the natural environment. Assistance in determining the design parameters to
minimize such damage may be found in the reference documents listed in
Section 6-156.
(1) Structural Requirements for-Major Structures:
(a) Design and Construction: Major structures shall be designed
and constructed in accordance with section 1205 of the 1986 revisions to the
1985 Standard Building Code using a fastest-mile wind velocity of 110 miles
for construction foundtelsewherelinlthecVillageiBuildingpCodeable standards
Elevation, Floodproofing, and Siting: All major structures shall
be designed, constructed and located in compliance with the National Flood
Insurance Regulations as found in 44 CFR Parts 59 and 60 or Chapter 12.5 of
the Village Code, whichever is more restrictive.
(b) Design Conditions: Velocity Pressure: Major structures shall
be designed in accordance with the requirements of Section 1205 of the 1986
revisions to the 1985 Standard Building Code using a minimum fastest-mile
wind velocity of 110 mph. These minimum design pressures are as follows:
Table 1205.2A
Velocity Pressure (psf)
Buildin4 Height 60 feet or less
Mean Roof Fastest-Mile 41ind Velocity, V (mph)
Height (f t) 110
0-15 25
20 28
40 34
60 38
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Table 1205.3A
Gust Velocity Pressure (psf)
Building Height Greater Than 60 Feet
Fastest-Mile Wind Velocity, V (mph)
Coastal Exposure
Height (ft) 110
0- 30 35
31- 50 40
51-100 47
100-200 54
200-300 61
300-400 66
400-500 70
(c) Foundations: The elevation of the soil surface to be used
in the design of foundations, calculation of pile reactions and bearing
capacities shall not be greater than that which would result from the
erosion reasonably anticipated as a result of design storm conditions.
Foundation design and construction of a major structure shall consider all
anticipated loads acting simultaneously with live and dead loads.
Erosion computations for foundation design shall account for all vertical
and lateral erosion and scour producing forces, including localized scour
due to the presence of structural components. Foundation design and
construction shall provide for adequate bearing capacity taking into
consideration the type of soil present and the anticipated loss of soil
above the design grade as a result of localized scour. Erosion computations
are not required landward of coastal construction control lines established
or updated since June 30, 1980. Upon request the Department of Natural
Resources may provide information as to those areas within coastal building
zones where erosion and scour of a 100-year storm event is applicable.
(d) Wave Forces: Calculations for wave forces resulting from
design storm conditions on building foundations and superstructures may be
based upon the minimum criteria and methods prescribed in the Naval
Facilities Engineering Command Design Manual, NAVFAC DM-26, U.~partment
of Nava; Shore Protection Manua-T. U.S. Department of the Array Corps of
Engineers; U. S. Department of the Arn~y Coastal Engineering Research Center
Technical Papers and Reports; the Technical and Design Memoranda of the
Division of Beaches and Shores, Florida Department of Natural Resources;
or other professionally recognized methodologies which produce equivalent
design criteria.
Breaking, broken, and nonbreaking waves shall be considered as
applicable. Design wave loading analysis shall consider vertical uplift
pressures and all lateral pressures to include impact as well as dynamic
loading and the harmonic intensification resulting from repetitive waves.
(e) Hydrostatic Loads: Calculations for hydrostatic loads shall
consider the maximum water pressure resulting from a fully peaked, breaking
wave superimposed upon the design storm surge with dynamic wave setup.
Both free and hydrostatic loads shall be considered. Hydrostatic loads
which are confined shall be determined by using the maximum elevation to
which the confined water would freely rise if unconfined. Vertical
hydrostatic loads shall be considered both upward and downward on horizontal
or inclined surfaces of major structures (i.e. floors, stabs, roofs, walls).
Lateral hydrostatic loads shall be considered as forces acting horizontally
above and below grade on vertical or inclined surfaces. Hydrostatic loads
on irregular or curved geometric surfaces shall be determined by considering
the separate vertical and horizontal components acting simultaneously
under the distribution of the hydrostatic pressures.
(f) Hydrodynamic Loads: Hydrodynamic loads shall consider the
maximum water pressures resulting from the motion of the water mass
associated with the design storm. Full intensity loading shall be applied
on all structural surfaces above the design grade which would affect the
flow velocities.
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(2) Structural Requirements for Nonhabitable Major Structures:
Nonhabitable major structures need not meet the specific structural
requirements of Section 6-155(1), except that they shall be designed to
produce the minimum adverse impact on the beach and dune system and shall
comply with the applicable standards of construction found in the Village
Building Code. All sewage treatment and public water supply systems shall
be flood-proofed to prevent infiltration of surface water anticipated
under design storm conditions. Underground utilities, excluding pad
transformers and vaults, shall be flood-proofed to prevent infiltration of
surface water expected under design storm conditions or shall otherwise be
designed to function when submerged under such storm conditions.
(3) Structural Requirements for Minor Structures: Minor
structures need not meet the specific structural requirements of Section
6-155(1), except that they shall be designed to produce the minimum adverse
impact on the beach and dune system and shall comply with the applicable
standards of construction found in the Village Building Code.
(4) Location of Construction: Construction, except for elevated
walkways, lifeguard support stands, piers, beach access ramps, gazebos, and
coastal or shore protection structures, shall be located a sufficient
distance landward of the beach to permit natural shoreline fluctuations and
to preserve dune stability. Construction, including excavation, may occur
to the extent that the natural storm buffering and protection capability of
the dune is not diminished.
(5) Public Access: Where the public has established an accessway
through private lands to lands seaward of mean high tide or water line by
prescription, prescriptive easement, or other legal means, development or
construction shall not interfere with such right of access unless a
comparable alternative accessway is provided. The developer shall have the
right to improve, consolidate, or relocate such public accessways so long
as they are:
(a) Of subtantially similar quality and convenience to the public:
(b) Approved by the local government and. approved by the Department
of Natural Resources whenever improvements are involved
seaward of the coastal construction control line; and
(c) Consistent with the coastal management element of the local
comprehensive plan adopted pursuant to Section 163.3178,
Florida Statutes.
Section 6-156. REFERENCES
References: Assistance in determining the design parameters and
methodologies necessary to comply with the requirements of this chapter
may be obtained from:
Shore Protection Manual, U.S. Array Corps of Engineers, 4th
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edition, 1 8 .
U. S. Department of the Army, Coastal Engineering Research Center's
Technical Papers and Reports.
Florida Department of Natural Resources, Division of Beaches and
Shores Technical and Design Memoranda.
Naval Facilities En ineerin Command Desi n Manual NAVFAC DM-26,
U. S. Department of t e Navy.
Coastal Construction Manual, Federal Emergency Management Agency,
February, P ease note tat a wind design section is based upon
the 1982 edition of the Standard Building Code with the 1984 accumulated
amendments and not the 1985 edition of the Standard Building Code with
the 1986 revisions as required by section 161.55(1)(d), Florida Statutes)
Section 2. This Ordinance shall take effect immediately upon
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passage.
PLACED ON FIRST READING THIS lath DAY OF NOVEMBER 1986.
PLACED ON SECOND, FINAL READING AND PASSED TfIE 11th DAY OF
DECEMBER 1986.
(Village Seal)
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M YOR
ATTEST:
VTl"age C erk