Section 3109 Structures Seaward of a Coastal Construction Control Line
The requirements of Section 3109 do not apply to the modification, maintenance or repair of existing habitable structures, provided all of the following apply to the modification, maintenance or repair:
Advisory Note. If the modification or repair is determined to be substantial improvement or substantial damage, and if the building is located in a special flood hazard area (Zone A and Zone V) established in Section 1612.3, the requirements of Florida Building Code, Existing Building applicable to flood hazard areas shall apply.
The following words and terms shall, for the purposes of this section, have the indicated meanings shown herein.
ALLOWED USE. For the purpose of Section 3109.3.4, use of enclosures above, or with dry floodproofing to, the elevation specified in ASCE 24 and below the 100-year storm elevation, includes, but is not limited to use for parking of vehicles, storage, building access, small mechanical and electrical rooms, retail shops, commercial pool bars and other bars, snack bars, commercial grills with portable cooking equipment, commercial dining areas where the permanent kitchen is located landward of the coastal construction control line or above the 100-year storm elevation, toilet rooms and bathrooms, cabanas, recreational spaces such as gyms and card rooms, commercial service/storage/back-of-house facilities; and uses of a similar nature that are not spaces for living, sleeping or cooking.
COASTAL CONSTRUCTION CONTROL LINE. The line established by the State of Florida pursuant to Section 161.053, Florida Statutes, and recorded in the official records of the respective county and which defines that portion of the beach-dune system subject to severe fluctuations based on a 100-year storm surge, storm waves or other predictable weather conditions.
COMBINED TOTAL STORM TIDE ELEVATION (VALUE). The elevation of combined total tides including storm surges, astronomical tide and dynamic wave setup which occurs primarily inside the wave breaking zone. The combined total storm tide elevations (values) for various return periods are determined by the Florida Department of Environmental Protection for each coastal county with an established coastal construction control lines and published in reports for each county titled "Revised Combined Total Storm Tide Frequency Analysis."
DESIGN GRADE. The predicted eroded grade, accounting for erosion and localized scour resulting from the presence of structural components, used in the calculation of flood loads, pile reactions and bearing capacities. The design grade shall be determined by a site-specific analysis prepared by a qualified registered design professional or the design grade may be determined by the Florida Department of Environmental Protection in the report titled "One-Hundred-Year Storm Elevation Requirements for Habitable Structures Located Seaward of a Coastal Construction Control Line" (1999).
FIFTY-FOOT SETBACK LINE. A line of jurisdiction, established pursuant to the provisions of Section 161.052, Florida Statutes, in which construction is prohibited within 50 feet (15.13 m) of the line of mean high water at any riparian coastal location fronting the Gulf of Mexico or the Atlantic coast shoreline.
LOW-RISE BUILDING. A structure with mean roof height less than or equal to 60 feet.
LOWEST FLOOR. For the purpose of Section 3109, the lowest floor of the lowest enclosed area, excluding any enclosure that complies with the requirements and limitations of Section 3109.3.4 applicable to enclosures below the flood elevation.
100-YEAR STORM ELEVATION. The height of the breaking wave crest or wave approach as superimposed on the storm surge with dynamic wave setup of a 100-year (one-percent-annual chance) storm. The 100-year storm elevation is determined by the Florida Department of Environmental Protection based on studies published as part of the Coastal Construction Control Line establishment process and an analysis of topographic and other site specific data and found in the report "One-Hundred-Year Storm Elevation Requirements for Habitable Structures Located Seaward of a Coastal Construction Control Line" (1999). An applicant may request the Department of Environmental Protection to determine a site-specific 100-year storm elevation for the location of the applicant's proposed structure as part of the environmental permit application process.
SUBSTANTIAL IMPROVEMENT. See Section 202.
The design and construction of habitable structures, including substantial improvement and repair of substantial damage to such structures, shall be in accordance with this section and with Section 1612 and ASCE 24, as applicable. Habitable structures subject to this section shall be designed to minimize the potential for wind- and water-borne debris during storms.
In addition to the requirements of ASCE 24 Section 4.5 for pile and columns foundations: