![]() Since flowing systems experience resistance (friction) to flow due to debris, vegetation, and stormwater infrastructure, the extent or elevation of the floodplain also changes. BFE Lines – BFE Lines are used to characterize the elevations of riverine or creek systems.Note: No Flood Florida will report a BFE value of None for any Moderate Risk or Low Risk Zone.This elevation is established using engineering models. ![]() ![]() Base Flood Elevation (BFE) – the elevation of the water associated with the 100 year floodplain.100 Year Floodplain – Often referred to as the Special Flood Hazard Area (SFHA) or the area of land that is expected to be impacted with water after a 100 year storm.In Florida, this event can equate to around 10-14 inches of rain over a 24-hr period. For example, in 2004 there were several “100 year storms” within a few months. This does not mean it will only happen once a year. 100 Year Storm - A storm that on average has a 1% chance of happening in any given year.Poorly planned development in floodplains can lead to stream-bank erosion, loss of valuable property, increased risk of flooding to downstream properties and degradation of water quality. Floodplains are scenic, valued wildlife habitat, and suitable for farming. Understanding and protecting the natural functions of floodplains helps reduce flood damage and protect resources. Additional Informationįloodplains are a natural component of the City of Charleston environment. Please be advised all work (including painting, interior finishes, etc.) in a Special Flood Hazard Area requires a permit. V-Zone Breakaway Wall Certificate (PDF).You may need to submit the following documents when applying for building and trade permits: Steps to Take if Your New Building Construction or Renovation Is Located in a Flood Zone Zone D: Areas in which flood hazards are undetermined but possible.Zone VE: Coastal flood with velocity hazard (wave action) base flood elevations determined.Zone V: Coastal flood with velocity hazard (wave action) no base flood elevations determined.Zone A99: To be protected from 100-year flood by Federal flood protection system under construction no base flood elevations determined.For areas of alluvial fan flooding, velocities also determined. Zone AO: Flood depths of 1 to 3 feet (usually sheet flow on sloping terrain) average depths determined.Zone AH: Flood depths of 1 to 3 feet ( usually areas of ponding) base flood elevations determined.Zone AE: Base flood elevations determined.Zone A: No base flood elevations determined.Zone X: Areas determined to be outside 500-year flood plain.Shaded Zone X: Areas of 500-year flood areas of 100-year flood with average depths of less than 1 foot or with drainage areas less than 1 square mile and areas protected by levees from 100-year flood.Types of Flood Zones Moderate to Low-Risk Areas To find out what flood zone your property is located within, FEMA has a searchable map provided for free on their website. Charleston is also subject to storm surge, flooding from heavy rains and high tides.īeing prepared is your best defense against such events. It is critical to remember that the City of Charleston, being located in the Atlantic Coastal region, is subject to flooding from the Atlantic Ocean as well as inland flooding from rivers and associated tributaries.
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