Section 62B-41.007 - Design, Siting and Other Requirements(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.Fla. Admin. Code Ann. R. 62B-41.007
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, Amended by Florida Register Volume 42, Number 250, December 28, 2016 effective 1/11/2017.New 8-23-92, Formerly 16B-41.007, Amended 10-23-01, 1-11-17.