Current through Reg. 50, No. 187; September 24, 2024
(1) The following requirements must be met
before a permit will be approved by the Department:
(a) All coastal construction shall be sited
and designed so as to minimize any expected adverse impact to the coastal
system, marine turtles and adjacent property and structures and be consistent
with this chapter.
(b) New coastal
armoring structures and major reconstruction of existing structures shall be
sited and designed to:
1. Provide only that
level of protection authorized herein. For nonconforming habitable major
structures, protection may be provided for the erosion impacts of up to a
10-year return interval storm event. When closing the gap in a line of existing
armoring of 250 feet or less, protection may be provided for the erosion
impacts of the lesser of the strengths of the adjacent armoring structures or a
15-year event, whichever is less. For other eligible structures, protection may
be provided from the erosion impacts of up to a 25-year return interval storm
event. Designated hurricane evacuation routes, public safety facilities and
historical sites of national significance may be provided protection of up to a
50-year return interval storm event, if feasible,
2. Be located as close to the structure to be
protected as possible, considering available construction techniques and
engineering practices,
3. Be
located so its construction and presence will not cause adverse impacts on the
adjacent property, as a result of normal tide, wave and sediment
processes,
4. Be the least
impactive siting and design possible which provides the authorized level of
protection; and,
5. Not result in
the loss of lateral public beach access.
(2) Coastal construction shall be designed in
accordance with established engineering and scientific practice, and the
following special guidelines:
(a) Rigid
coastal structures shall be designed to withstand the hydrostatic and
hydrodynamic forces associated with the design storm for which they are
justified.
(b) The seaward face of
rock revetments shall normally be no steeper than one foot vertical to two feet
horizontal.
(c) Revetments, rubble
mounds and similarly-designed structures shall utilize a filter medium
consistent with sound engineering practices beneath and, if appropriate, behind
them to prevent settlement and the loss of unconsolidated material through and
under the structure.
(d) Armor
stone used in revetments and as toe scour protection shall have a minimum dry
unit weight of 140 pounds per cubic foot, except under circumstances where a
potential adverse impact on marine turtles may exist. In such cases armor stone
shall have a minimum dry unit weight of 150 pounds per cubic foot. Armor stone
units shall not be of greater size or weight than appropriate for the design
wave conditions.
(e) If concrete is
used as a construction material in a rigid structure, it will be designed to
meet unit weight, individual component and durability requirements, as well as
strength and corrosion standards appropriate for the coastal
environment.
(f) Armor and bedding
stone will be durable, hard, free from laminations, weak cleavages, and sound
enough to avoid fracturing.
(g) Toe
scour protection for seawalls and bulkheads shall be designed to meet both
geotechnical and hydraulic criteria.
(h) Toe penetration elevations for
revetments, bulkheads and seawalls shall account for the effects of
wave-induced scour associated with the design storm event. However, when
designing armoring there shall be no additional safety factor applied in
determining the depth of penetration of the structure.
(i) Seawalls, bulkheads, revetments and toe
scour protection shall be designed so as not to increase the potential for
flooding impacts to upland structures from wave run up and overtopping of the
structure during the authorized design storm.
(j) To protect the environmental functions of
Florida's beaches, only beach compatible fill shall be placed on the beach or
in any associated dune system. Beach compatible fill is material that maintains
the general character and functionality of the material occurring on the beach
and in the adjacent dune and coastal system. Where adequate geotechnical data
is available to establish the characteristics of native beach sediment at the
placement site, fill material shall be similar to the characteristics of native
beach sediment. Native beach sediment refers to the material within the coastal
system at the fill placement site prior to the original beach restoration. Such
material shall be predominately of carbonate, quartz or similar material with a
particle size distribution ranging between 0.062mm (4.0__) and 4.76mm (-2.25__)
(classified as sand by either the Unified Soils or the Wentworth
classification), shall be similar in color and grain size distribution (sand
grain frequency, mean and median grain size and sorting coefficient) to the
native beach sediment or to the material in the existing coastal system at the
disposal site and shall not contain:
1.
Greater than 5 percent, by weight, silt, clay or colloids passing the #230
sieve (4.0__),
2. Greater than 5
percent, by weight, fine gravel retained on the #4 sieve (-2.25__),
3. Coarse gravel, cobbles or material
retained on the 3/4 inch sieve in a percentage or size greater than found on
the native beach,
4. Construction
debris, toxic material or other foreign matter; and,
5. Not result in cementation of the beach.
If rocks or other non-specified materials appear on the
surface of the filled beach in excess of 50% of background in any 10, 000
square foot area, then surface rock should be removed from those areas. These
areas shall also be tested for subsurface rock percentage and remediated as
required. If the natural beach exceeds any of the limiting parameters listed
above, then the fill material shall not exceed the naturally occurring level
for that parameter.
(k) Pursuant to subsection
62B-41.005(15),
F.A.C., sandy sediment derived from the maintenance of coastal navigation
channels shall be deemed suitable for beach placement with up to 10% fine
material passing the #230 sieve, provided that it meets the criteria contained
in subparagraphs (j)2. through 5., above, and water quality standards. If this
material contains between 10% and 20% fine material passing the #230 sieve by
weight, and it meets all other sediment and water quality standards, it shall
be considered suitable for placement in the nearshore portion of the
beach.
(l) Beach/dune vegetation
shall be native salt-resistant vegetation suitable for beach and dune
stabilization.
(m) Altered inlets
may be designed for a maximum allowable depth determined by inlet stability,
water quality or navigation needs plus advanced maintenance. Minimum water
depths will be determined after adequate analysis of inlet hydraulics by the
applicant. The minimum water depth and cross section will be selected which
also insures that the inlet will remain stable under normal
conditions.
(n) The beach fill
template shall be designed to account for naturally occurring variables that
are reasonably expected to occur, such as the waves and tides of significant
winter weather events and impacts to the beach fill from the occurrence of high
frequency storm events at the project site.
(3) The Department reserves the right to
approve deviations from the special guidelines outlined in subsection (2),
above, if those deviations would not increase the potential for adverse impacts
to the coastal system or marine turtles. When requesting such deviations, the
applicant shall provide fully documented evidence that would justify the
deviations.
(4) The applicant shall
provide the Department with certification by a professional engineer registered
in the State of Florida that the design plans and specifications, studies and
other coastal process analyses submitted as part of the permit application are
in compliance with the standards established in this chapter.
(5) For maintenance activities of previously
permitted and constructed beach nourishment and inlet management projects for
which there are no substantial changes in project scope, the applicant will
submit monitoring data and analyses that demonstrate that the project has
performed according to design expectations.
Rulemaking Authority
161.041(1),
161.055(1),
(2),
161.085(5) FS.
Law Implemented 161.041(1), (2), (3), (4), (7)(b),
(8),
161.042,
161.051,
161.085(1),
(2),
161.091,
161.142(1),
(2),
161.163,
379.2431(1)
FS.
New 8-23-92, Formerly 16B-41.007, Amended 10-23-01,
1-11-17.
