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

hazard areas, alteration of sand dunes and mangrove stands shall be permitted only if such alteration is approved by the Florida Department of Environmental Protection and only if the engineering analysis required by section 3. 05. 05( C) of this code demonstrates that the proposed alteration will not increase the potential for flood damage. Construction or restoration of dunes under or around elevated buildings and structures shall comply with section 3. 05. 14( H) of this code. 3. 05. 12 Flood Resistant Development —Manufactured Homes A. General. All manufactured homes installed in flood hazard areas shall be installed by an installer that is licensed pursuant to section 320. 8249, F. S., and shall comply with the requirements of Chapter 15C- I, P.A. C. and the requirements of this section. B. Foundations. All new manufactured homes and replacement manufactured homes installed in flood hazard areas shall be installed on permanent, reinforced foundations that: 1. In flood hazards areas ( Zone A) other than coastal high hazard areas, are designed in accordance the foundation requirements of the Florida Building Code, Residential Section R322. 2 and this section. 2. In coastal high hazard areas ( Zone V), are designed in accordance with the foundation requirements of the Florida Building Code, Residential Section R322.3 and this section. C. Anchoring. All new manufactured homes and replacement manufactured homes shall be installed using methods and practices which minimize flood damage and shall be securely anchored to an adequately anchored foundation system to resist flotation, collapse or lateral movement. Methods of anchoring include, but are not limited to, use of over -the -top or frame ties to ground anchors. This anchoring requirement is in addition to applicable state and local anchoring requirements for wind resistance. D. Elevation. Manufactured homes that are placed, replaced, or substantially improved shall comply with section 3. 05. 12 ( E) or 3. 05. 12 ( F) of this code, as applicable. E. General elevation requirement. Unless subject to the requirements of section 3. 05. 12 F) of this code, all manufactured homes that are placed, replaced, or substantially improved on sites located: ( a) outside of a manufactured home park or subdivision; ( b) in a new manufactured home park or subdivision; ( c) in an expansion to an existing manufactured home park or subdivision; or ( d) in an existing manufactured home park or 17 subdivision upon which a manufactured home has incurred " substantial damage" as the result of a flood, shall be elevated such that the bottom of the frame is at or above the elevation required, as applicable to the flood hazard area, in the Florida Building Code, Residential Section R322. 2 ( Zone A) or Section R322.3 ( Zone V). F. Elevation requirement for certain existing manufactured home parks and subdivisions. Manufactured homes that are not subject to section 3. 05. 12 ( E) of this code, including manufactured homes that are placed, replaced, or substantially improved on sites located in an existing manufactured home park or subdivision, unless on a site where substantial damage as result of flooding has occurred, shall be elevated such that either the: 1. Bottom of the frame of the manufactured home is at or above the elevation required, as applicable to the flood hazard area, in the Florida Building Code, Residential Section R322.2 ( Zone A) or Section R322.3 ( Zone V); or 2. Bottom of the frame is supported by reinforced piers or other foundation elements of at least equivalent strength that are not less than 36 inches in height above grade. G. Enclosures. Fully enclosed areas below elevated manufactured homes shall comply with the requirements of the Florida Building Code, Residential Section R322 for such enclosed areas, as applicable to the flood hazard area. H. Utility equipment. Utility equipment that serves manufactured homes, including electric, heating, ventilation, plumbing, and air conditioning equipment and other service facilities, shall comply with the requirements of the Florida Building Code, Residential Section R322, as applicable to the flood hazard area. 3. 05. 13 Flood Resistant Development —Recreational Vehicles and Park Trailers A. Temporary placement. Recreational vehicles and park trailers placed temporarily in flood hazard areas shall: 1. Be on the site for fewer than 180 consecutive days; or 2. Be fully licensed and ready for highway use, which means the recreational vehicle or park model is on wheels or jacking system, is attached to the site only by quick -disconnect type utilities and security devices, and has no permanent attachments such as additions, rooms, stairs, decks and porches. B. Permanent placement. Recreational vehicles and park trailers that do not meet the limitations in section 3. 05. 13 of this code for temporary placement shall meet the requirements of section 3. 05. 12 of this code for manufactured homes. 3. 05. 14 Flood Resistant Development —Tanks A. Underground tanks. Underground tanks in flood hazard areas shall be anchored to prevent flotation, collapse or lateral movement resulting from hydrodynamic and 18 hydrostatic loads during conditions of the design flood, including the effects of buoyancy assuming the tank is empty. B. Above -ground tanks, not elevated. Above -ground tanks that do not meet the elevation requirements of section 3. 05. 14 ( C) of this code shall: 1. Be permitted in flood hazard areas ( Zone A) other than coastal high hazard areas, provided the tanks are anchored or otherwise designed and constructed to prevent flotation, collapse or lateral movement resulting from hydrodynamic and hydrostatic loads during conditions of the design flood, including the effects of buoyancy assuming the tank is empty and the effects of flood -borne debris. 2. Not be permitted in coastal high hazard areas ( Zone V). C. Above -ground tanks, elevated. Above -ground tanks in flood hazard areas shall be attached to and elevated to or above the design flood elevation on a supporting structure that is designed to prevent flotation, collapse or lateral movement during conditions of the design flood. Tank -supporting structures shall meet the foundation requirements of the applicable flood hazard area. D. Tank inlets and vents. Tank inlets, fill openings, outlets and vents shall be 1. At or above the design flood elevation or fitted with covers designed to prevent the inflow of floodwater or outflow of the contents of the tanks during conditions of the design flood; and 2. Anchored to prevent lateral movement resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy, during conditions- of the design flood. 3.05. 15 Flood Resistant Development— Other Development A. General requirements for other development. All development, including man- made changes to improved or unimproved real estate for which specific provisions are not specified in this section or the Florida Building Code, shall: 1. Be located and constructed to minimize flood damage; 2. Meet the limitations of section 3. 05. 1 1 ( D) of this code if located in a regulated floodway; 3. Be anchored to prevent flotation, collapse or lateral movement resulting from hydrostatic loads, including the effects of buoyancy, during conditions of the design flood; 4. Be constructed of flood damage- resistant materials; and 5. Have mechanical, plumbing, and electrical systems above the design flood elevation, except that minimum electric service required to address life safety and electric code requirements is permitted below the design flood elevation provided it conforms to the provisions of the electrical part of building code for wet locations. 19 B. Fences in regulated floodways. Fences in regulated floodways that have the potential to block the passage of floodwaters, such as stockade fences and wire mesh fences, shall meet the limitations of section 3. 05. 11 ( D) of this code. C. Retaining walls, sidewalks and driveways in regulated floodways. Retaining walls and sidewalks and driveways that involve the placement of fill in regulated floodways shall meet the limitations of section 3. 05. 11 ( D) of this code. D. Roads and watercourse crossings in regulated floodways. Roads and watercourse crossings, including roads, bridges, culverts, low -water crossings and similar means for vehicles or pedestrians to travel from one side of a watercourse to the other side, that encroach into regulated floodways shall meet the limitations of section 3. 05. 11 ( D) of this code. Alteration of a watercourse that is part of a road or watercourse crossing shall meet the requirements of section 3. 05.05 ( C) of this code. E. Concrete slabs used as parking pads, enclosure floors, landings, decks, walkways, patios and similar nonstructural uses in coastal high hazard areas ( Zone V). In coastal high hazard areas, concrete slabs used as parking pads, enclosure floors, landings, decks, walkways, patios and similar nonstructural uses are permitted beneath or adjacent to buildings and structures provided the concrete slabs are designed and constructed to be: 1. Structurally independent of the foundation system of the building or structure; 2. Frangible and not reinforced, so as to minimize debris during flooding that is capable of causing significant damage to any structure; and 3. Have a maximum slab thickness of not more than four (4) inches. F. Decks and patios in coastal high hazard areas ( Zone V). In addition to the requirements of the Florida Building Code, in coastal high hazard areas decks and patios shall be located, designed, and constructed in compliance with the following: 1. A deck that is structurally attached to a building or structure shall have the bottom of the lowest horizontal structural member at or above the design flood elevation and any supporting members that extend below the design flood elevation shall comply with the foundation requirements that apply to the building or structure, which shall be designed to accommodate any increased loads resulting from the attached deck. 2. A deck or patio that is located below the design flood elevation shall be structurally independent from buildings or structures and their foundation systems, and shall be designed and constructed either to remain intact and in place during design flood conditions or to break apart into small pieces to minimize debris during flooding that is capable of causing structural damage to the building or structure or to adjacent buildings and structures. 3. A deck or patio that has a vertical thickness of more than twelve ( 12) inches or that is constructed with more than the minimum amount of fill necessary for site 20  drainage shall not be approved unless 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 the building or structure or to adjacent