Fort Walton Beach Ordinance — 1865 - Flood Plain Management — reading text

elevated buildings and structures. 4. A deck or patio that has a vertical thickness of twelve ( 12) inches or less and that is at natural grade or on nonstructural fill material that is similar to and compatible with local soils and is the minimum amount necessary for site drainage may be approved without requiring analysis of the impact on diversion of floodwaters or wave runup and wave reflection. G. Other development in coastal high hazard areas ( Zone V). In coastal high hazard areas, development activities other than buildings and structures shall be permitted only if also authorized by the appropriate state or local authority; if located outside the footprint of, and not structurally attached to, buildings and structures; and if analyses prepared by qualified registered design professionals demonstrate no harmful diversion of floodwaters or wave runup and wave reflection that would increase damage to adjacent buildings and structures. Such other development activities include but are not limited to: I. Bulkheads, seawalls, retaining walls, revetments, and similar erosion control structures; 2. Solid fences and privacy walls, and fences prone to trapping debris, unless designed and constructed to fail under flood conditions less than the design flood or otherwise function to avoid obstruction of floodwaters; and 3. On -site sewage treatment and disposal systems defined in 64 & 6. 002, F. A.C., as filled systems or mound systems. H. Nonstructural fill in coastal high hazard areas ( Zone V). In coastal high hazard areas: 1. Minor grading and the placement of minor quantities of nonstructural fill shall be permitted for landscaping and for drainage purposes under and around buildings. 2. Nonstructural fill with finished slopes that are steeper than one unit vertical to five units horizontal shall be permitted only if an analysis prepared by a qualified registered design professional demonstrates no harmful diversion of floodwaters or wave runup and wave reflection that would increase damage to adjacent elevated buildings and structures. 3. Where authorized by the Florida Department of Environmental Protection or applicable local approval, sand dune construction and restoration of sand dunes under or around elevated buildings are permitted without additional engineering analysis or certification of the diversion of floodwater or wave runup and wave reflection if the scale and location of the dune work is consistent with local beach - dune morphology and the vertical clearance is maintained between the top of the sand dune and the lowest horizontal structural member of the building. 3.05. 16 Florida Building Code, Building, Administrative Amendments. 21 The 2010 Florida Building Code, is hereby amended by the following administrative amendments to the Florida Building Code, Building. 107. 6. 1 Building permits issued on the basis of an affidavit. Pursuant to the requirements of federal regulation for participation in the National Flood Insurance Program ( 44 C. F.R. Sections 59 and 60), the authority granted to the Building Official to issue permits, to rely on inspections, and to accept plans and construction documents on the basis of affidavits and plans submitted pursuant to 105. 14 and section 3. 05. 06 ( G), shall not extend to the flood load and flood resistance construction requirements of the Florida Building Cade. 117 VARIANCES IN FLOOD HAZARD AREAS 117. 1 Flood hazard areas. Pursuant to section 553. 73( 5), F.S., the variance procedures adopted in the Land Development Code shall apply to requests submitted to the Building Official for variances to the provisions of Section 1612.4 of the Florida Building Code, Building or, as applicable, the provisions of R322 of the Florida Building Code, Residential. This section shall not apply to Section 3109 of the Florida Building Code, Building. 3. 05. 17 Definitions. A. Scope. Unless otherwise expressly stated, the following words and terms shall, for the purposes of this section, have the meanings shown in this section. B. Terms defined in the Florida Building Code. Where terms are not defined in this section and are defined in the Florida Building Code, such terms shall have the meanings ascribed to them in that code. C. Terms not defined. Where terms are not defined in this section or the Florida Building Code, such terms shall have ordinarily accepted meanings such as the context implies. Alteration of a watercourse. A dam, impoundment, channel relocation, change in channel alignment, channelization, or change in cross -sectional area of the channel or the channel capacity, or any other form of modification which may alter, impede, retard or change the direction and/ or velocity of the riverine flow of water during conditions of the base flood. Appeal. A request for a review of the Floodplain Administrator' s interpretation of any provision of this section or a request for a variance. ASCE 24. A standard titled Flood Resistant Design and Construction that is referenced by the Florida Building Code. ASCE 24 is developed and published by the American Society of Civil Engineers, Reston, VA. 22 Base Flood. A flood having a 1- percent chance of being equaled or exceeded in any given year. [ Also defined in FBC, B, Section 1612.2.] The base flood is commonly referred to as the " 100 -year flood" or the " l- percent -annual chance flood." Base Flood elevation. The elevation of the base flood, including wave height, relative to the National Geodetic Vertical Datum ( NGVD), North American Vertical Datum NAVD) or other datum specified on the Flood Insurance Rate Map ( FIRM). [ Also defined in FBC, B, Section 1612.2.] Basement. The portion of a building having its floor subgrade ( below ground level) on all sides. [ Also defined in FBC, B, Section 1612. 2.] Coastal construction control line. The line established by the State of Florida pursuant to section 161. 053, F. S., and recorded in the official records of the community, 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. Coastal high hazard area. A special flood hazard area extending from offshore to the inland limit of a primary frontal dune along an open coast and any other area subject to high velocity wave action from storms or seismic sources. Coastal high hazard areas are also referred to as " high hazard areas subject to high velocity wave action' or " V Zones" and are designated on Flood Insurance Rate Maps ( FIRM) as Zone Vl -V30, VE, or V. Note: The FBC,B defines and uses the term ` flood hazard areas subject to high velocity wave action" and the FBC, R uses the term " coastal high hazard areas "] Design flood. The flood associated with the greater of the following two areas: [ Also defined in FBC, B, Section 1612. 2.] 1. Area with a floodplain subject to a I- percent or greater chance of flooding in any year; or 2. Area designated as a flood hazard area on the community' s flood hazard map, or otherwise legally designated. Design flood elevation. The elevation of the " design flood," including wave height, relative to the datum specified on the community' s legally designated flood hazard map. In areas designated as Zone AO, the design flood elevation shall be the elevation of the highest existing grade of the building' s perimeter plus the depth number ( in feet) specified on the flood hazard map. In areas designated as Zone AO where the depth number is not specified on the map, the depth number shall be taken as being equal to 2 feet. [ Also defined in FBC, B, Section 1612. 2.] Development. Any man -made change to improved or unimproved real estate, including but not limited to, buildings or other structures, tanks, temporary structures, temporary or permanent storage of equipment or materials, mining, dredging, filling, grading, paving, excavations, drilling operations or any other land disturbing activities. Encroachment. The placement of fill, excavation, buildings, permanent structures or 23 other development into a flood hazard area which may impede or alter the flow capacity of riverine flood hazard areas. Existing building and existing structure. Any buildings and structures for which the start of construction' commenced before the City' s first floodplain management ordinance was adopted and also defined in ABC, B, Section 1612. 2. Existing manufactured home park or subdivision. A manufactured home park or subdivision for which the construction of facilities for servicing the lots on which the manufactured homes are to be affixed ( including, at a minimum, the installation of utilities, the construction of streets-, and either final site grading or the pouring of concrete pads) is completed before the City' s first floodplain management ordinance was adopted. Expansion to an existing manufactured home park or subdivision. The preparation of additional sites by the construction of facilities for servicing the lots on which the manufactured homes are to be affixed ( including the installation of utilities, the construction of streets, and either final site grading or the pouring of concrete pads). Federal Emergency Management Agency ( FEMA). The federal agency that, in addition to carrying out other functions, administers the National Flood Insurance Program. Flood or flooding. A general and temporary condition of partial or complete inundation of normally dry land from: [ Also defined in ABC, B, Section 1612. 2.] 1. The overflow of inland or tidal waters. 2. The unusual and rapid accumulation or runoff of surface waters from any source Flood damage -resistant materials. Any construction material capable of withstanding direct and prolonged contact with floodwaters without sustaining any damage that requires more than cosmetic repair. [ Also defined in FBC, B, Section 1612. 2.] Flood hazard area. The greater of the following two areas: [ Also defined in FBC, B, Section 1612. 2.] 1. The area within a floodplain subject to a I- percent or greater chance of flooding in any year. 2. The area designated as a flood hazard area on the community' s flood hazard map, or otherwise legally designated. Flood Insurance Rate Man ( FIRM). The official map of the community on which the Federal Emergency Management Agency has delineated both special flood hazard areas and the risk premium zones applicable to the community. [ Also defined in FBC, B, Section 1612. 2.] Flood Insurance Study ( FIS). The official report provided by the Federal Emergency Management Agency that contains the Flood Insurance Rate Map, the Flood Boundary 24 and Floodway Map ( if applicable), the water surface elevations of the base flood, and supporting technical data. [ Also defined in FBC, B, Section 1612. 2.] Floodplain Administrator. The office or position designated and charged with the administration and enforcement of this section ( may be referred to as the Floodplain Manager). Floodplain development permit or approval. An official document or certificate issued by the community, or other evidence of approval or concurrence, which