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/0PR <br />INDIAN RIVER COUNTY, FLORIDA <br />MEMORANDUM <br />TO: Jason E. Brown; County Administrator <br />DEPARTMENT HEAD CONCURRENCE: <br />THROUGH: Phil Matson, AICP; Community Development Director <br />FROM: Scott McAdam, Building Official <br />DATE: December 14, 2020 <br />SUBJECT: 2020 Indian River County Amended Wind Speed Maps <br />It is requested that the data herein presented be given formal consideration by the Board of <br />County Commissioners at its regular meeting of January 5, 2021. <br />DESCRIPTION & CONDITIONS: <br />The Florida Building Codes (FBC) are updated on a 3 -year cycle. The effective date of the new <br />20207 1h Edition Florida Building Codes is midnight December 31, 2020. <br />As part of the new 7th Edition of the FBC the state Wind Speed maps, Figures 1609.3(1)-(3) have <br />been altered to now include one additional map, Figures 1609.3(1)-(4). <br />According to the Florida Statutes and Florida Building Codes, the exact location of wind speed <br />lines shall be established by local ordinance, using recognized physical landmarks such as major <br />roads, canals, rivers, and lake shores, wherever possible. <br />Under the current FBC "6th Edition (2017) FBC," basic wind speed or the ultimate design wind <br />speed for the development of wind loads are now determined from one of three maps (Risk <br />Category I, Risk Category II, and Risk Category III and IV) depending upon the Risk Category <br />of the structure being designed. <br />Changes in the 2020 7th Edition FBC related to wind load design (wind speed lines) will add a <br />new fourth figure/map with increased wind speeds, which will only affect the ultimate design <br />wind speed for use in the design of Risk Category IV essential/critical buildings and structures <br />(i.e. fire stations, emergency treatment, emergency shelters, power generating plants, aviation <br />control towers, national defense facilities), which shall be obtained from Figure 1609.3(3). The <br />ultimate design wind speed for use in the design of Risk Categories I, II and III shall remain the <br />same. For Risk Category IV the 2020 7th edition FBC is adopting the 3,000 Year (Risk Cat IV) <br />Map in ASCE 7-16. <br />120 <br />