Ordinance 1986-003 Adopts Coastal Building Zone Building Code 1985 EditionURllINANCE NO. 3 - 1986
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,
'PHE COASTAL ZONE PROTECTION ACT OF 1985, 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 of the Village of North Palm
Beach Code is hereby amended by adding thereto Article VII,
which said Article shall read as follows:
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. 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 natural disasters occurring along the coastal areas of
the Village which front on the Atlantic Ucean. 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 and coastal barrier
islands as defined herein and is not applicable to other
locations. In the event of a conflict between this article and
other sections of this Code, the requirements resulting in more
restrictive design shall apply. No provisions in this article
shall be construed to permit any construction in any area
prohibited by local city, county or state regulation.
Section 6-153. 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.
(a) The new construction of, or improvement to major
' structures, nonhabitable major structures and minor structures
as defined herein.
(b) Construction which would change or alter the
character of the shoreline (e.g. excavation, grading, paving).
The Coastal Code does not apply to minor work in the nature of
normal beach cleaning or debris removal.
Section 6-154. Existing Structures.
The requirements of this article shall not apply to
existing structures, structures under construction or
structures for which a valid and unexpired municipal or county
building permit was issued prior to the adoption of the Coastal
Code.
Section 6-155. Multi-tone Structures.
' For structures ,located partially in the coastal
building zone, the requirements of the Coastal Code shall apply
to the entire structure.
Section 6-156. Construction Seaward of Mean High
Water.
Structures or construction extending seaward of the
mean high water line which are regulated by Section 161.041,
Florida Statutes, (e.g. groins, jetties, moles, breakwaters,
seawalls, revetments, beach nourishment, inlet dredging, etc.),
are specifically exempt from the provisions of this article.
In addition, the Coastal Code does not apply to piers,
pipelines or outfalls which are regulated pursuant to the
provisions of Section 161.053, Florida Statutes.
Section 6-157. Applications for Permits.
Applications for building permits for all construction
in the coastal building zone and on coastal barrier islands, if
not of normal or usual design as determined by the Building
Official, shall be certified by an architect or professional
engineer registered in the State of Florida. Such
certification shall state that the design plans and
' specifications for the construction are in compliance with the
criteria established by this Coastal Code.
Section 6-158. General Definitions.
The following terms are defined for general use in the
Coastal Code:
(a) "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".
(b) "Breakaway wall" or "frangible wall" means a
partition independent of supporting structural members that
will withstand design wind forces, but will fail under
hydrostatic, 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 that will
minimize the potential for damage to life or adjacent
property.
(c) "Building Support Structure" means any structure
which supports floor, wall or column loads, and transmits them
' to the foundation. The term shall include beams, grade beams
or joists, and includes the lowest horizontal structural member
exclusive of piles, columns or footings.
(d) "Coastal Barrier Islands" means geological
features which are completely surrounded by marine waters that
front upon the open waters of the Gulf of Mexico, Atlantic
ocean, Florida Bay or Strait of Florida and are composed of
quartz sands, clays, limestone, oolites, rock, coral, coquina,
sediment or other material, including soil disposal, which
(m) "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.
Section 6-159. General Coastal Construction
uirements.
Construction within the coastal building zone and on
coastal barrier islands shall meet the requirements of this
article and shall comply with the applicable standards of
' construction found elsewhere in this Code. 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 6-164.
Section 6-160. Structural Requirements for Major
Structures.
(a) Foundations.
All major structures shall be anchored to their
foundations in such a manner as to prevent flotation, collapse
or lateral displacement.
Foundation design and construction shall consider all
anticipated loads resulting from design storm conditions,
including wave, hydrodynamic, hydrostatic and wind loads acting
simultaneously with 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.
1. Pile Foundations - shall be required for buildings
' located in Federal Emergency
Management Agency Flood
Insurance Rate Map "V"
(velocity) zones or where
impacted by wave action.
(A) Pile dimensions, spacing and embedment shall
be designed consistent with the requirements
of the site, taking into account all
vertical, lateral, erosion and
scour-producing forces.
(B) Piles shall be driven to a penetration which
achieves adequate bearing capacity taking
into consideration the anticipated loss of
soil above the design grade.
(C) In addition to the normal foundation
analysis, the pile foundation analysis shall
consider piles in column action, where
appropriate, from the bottom of the support
structure to the design grade.
(D) Consideration shall also be given to the
degree of exposure to wave attack and the
resulting impact loads on lateral or diagonal
bracing between piles.
2. Monolothic Foundations -
may be permitted in
Federal Emergency
Management Agency Flood
Insurance Rate Map "A"
or "B" zones or in
locations not impacted
by wave action.
(A) Monolithic foundations may be used if soil
conditions permit and if located at an
elevation which minimizes their effect on the
beach and adjacent properties. Due
consideration shall be given to their
vulnerability to erosion under design storm
conditions.
(B) In the event that a monolithic foundation is
used, the maximum elevation of the top of the
slab is to be below the design scour depth
' (see Chapter 5.28, Shore Protection Manual,
U.S. Army Corps of Engineers, 4th edition,
1989) unless positive methods are provided to
prevent scour.
(C) Other types of spread footings such as
running footers or pads may be permitted when
positive methods are provided to prevent
scour.
(b) Understructures.
No substantial walls or partitions shall be
constructed below the level of the first finished floor. This
does not preclude the construction of:
1. Stairways;
2. Shearwalls essentially perpendicular to breaking
waves;
3. Shearwalls essentially parallel to breaking waves
which do not exceed a maximum of 208 of the building length;
' 4. Wind or sand screens constructed of fabric or wire
mesh;
5. Light open lattice partitions with individual
wooden lattice strips no greater than 3/4" thick or 3" wide;
6. Elevator shafts;
7. Breakaway or frangible walls; or
8. Substantial walls constructed above the wave
action and storm surge expected under design storm conditions.
(c) Building and Floor Elevations.
The minimum elevation for the underside of the
building support structure (excluding foundation) shall be
above the elevation of the design breaking wave crests or wave
uprush superimposed on the storm surge with dynamic wave setup
expected under design storm conditions. The elevation of the
storm surge with dynamic wave setup shall be either the
elevation established by the Florida Department of Natural
Resources Coastal Construction Control Line Study or the base
flood elevation for the specific area established by the
Federal Emergency Management Agency as determined by the design
engineer.
(d) Erosion and Design Grade.
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
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design storm conditions. Calculation of the design grade shall
take into account localized scour due to the presence of
structural components. Erosion computations for foundation
design shall consider all vertical and lateral erosion and
scour-producing forces.
(e) Wave Force Design.
1. 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 Desi n Manual,
NAVFAC DM-26, U.S. Department of Navy; Shore Protection Manual,
U.S. Department of the Army Corps of Engineers; U.S. Department
of the Army Coastal Engineering Research Center Technical
Papers and Reports; the Technical and Design Memoranda of the
Division of Beaches and Shores, Florida Department of Natural
kesources; or other professionally recognized methodologies
which produce equivalent design criteria.
2. 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.
(f) 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 using
the maximum elevation to which the confined water would freely
' rise if unconfined. Vertical hydrostatic loads shall be
considered both vertically downward and upward on horizontal or
inclined surfaces of major structures (e.g. floors, slabs,
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.
(g) 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.
(h) Design Conditions - General.
1. Foundations for all major structures shall be
designed for the horizontal and vertical pressures generated by
wave forces between the elevation of the design breaking wave
crests or wave uprush superimposed upon the storm surge and the
' stable soil elevation of the site.
2. All major structures, except mobile homes, shall
be designed to withstand 140 mph windspeeds. Horizontal wind
velocity pressures shall not be less than the values given
below:
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BASIC WIND VELOCITY DESIGN PRESSURE
(Pounds per Square Foot)
tandard Building Code South Florida Building Code
height Pressure Height Pressure
(f t) (psf) f( t) (psf)
0-30 91 0-5 30
31-50 54 5-15 37
51-100 65 15-25 95
'
101-200 79 25-35 50
201-300 92 35-55 56
301-900 101 55-75 63
901-500 109 75-100 68
501-800 121 100-150 75
801-1000 133 150-250 83
over 1000 137 250-350 97
350-550 109
550-750 121
750-1000 132
over 1000 137
*The above table is based upon the formula P=.00256 X V2 X
(ti/30)2/7, where: P = pressure in pounds/square foot
V = 190 mph
H = height above grade in feet
3. Appropriate shape factors shall be applied for
resistance against overturning and uplift as required elsewhere
in this Code. Internal pressures on internal walls, ceilings
and floors resulting from damaged windows or doors shall also
be considered in the design unless the specified windows and
doors have been tested by an approved testing agency and have
been shown to be capable of withstanding the design pressuces
required herein.
4. Mobile homes shall conform to the Federal Mobile
Home Construction and Safety Standards of the Uniform Standards
Code ANSI book A-119.1, pursuant to s. 320.823, Florida
Statutes, in addition to the other requirements contained in
this article.
Section 6-161. Structural Requirements for
Nonhabitable Major Structures.
Nonhabitable major structures need not meet the
specific structural requirements of Section 6-160, 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 elsewhere in this Code.
Section 6-162. 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.
Section 6-163. 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 any other legal
means, development or construction shall not interfere with
such right of access unless a comparable alternative accessway
is provided. 'Phe developer shall have the right to improve,
consolidate or relocate such public accessways so long as they
are:
(a) Of substantially similar quality and convenience
to the public;
(b) Approved by the local government; and
' (c) Consistent with the coastal management element of
the local comprehensive plan adopted pursuant to
Section 163.3178, Florida Statutes.
Section 6-169. References.
Assistance in determining the design parameters and
methodologies necessary to comply with the requirements of this
article may be obtained from:
Shore Protection Manual, U.S. Army Corps of Engineers,
4th edition, 1984.
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 Engineering Command Desi n Manual,
NAVFAC DM-26, U.S. Department of the Navy.
Section 2. This Ordinance shall take effect
' immediately upon passage.
PLACED ON FIRST READING THIS 13TH DAY OF MARCH , 1986.
PLACED ON SECOND, FINAL READING AND PASSED THIS 27TH DAY
OF MARCH 1986.
(Village Seal)
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ATTEST:
~<-Gf~i4 ~-+Ei~ 1. ice/ C.
Village Clerk
1131P/de
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