![]() ![]() This requirement is for new, substantially modified, or substantially damaged structures. We will refer to it as an A Zone (highlighted) when we mean to separate it from the AE Zone.)Īll of the A Zones require that the top of the lowest floor (including the basement floor) be constructed above or at the Base Flood Elevation (BFE). This document will refer to them as A Zones when we mean to differentiate it from a V Zone. However, they may also be referring to the designated A Zone as opposed to the AE Zone. ![]() They may be referring to the difference between the two. FEMA and most consultants (engineers and architects) will often refer to either an A Zone or a V Zone. (Note – The terminology beyond this point can get confusing. As mentioned previously, each zone has its own sub-designations and subtleties that we attempt to explain below.Ī Zones can be divided into zones AE, A1-30, AO and A. Scour can be a factor in all flood zones. Though A Zones are mostly thought of as stagnant water, initial flooding or receding floodwaters can cause scour against building foundations or other structures. Picture large waves crashing against a foundation. The second category - V Zones - implies “Velocity.” It means forces from the movement of water will be significant. Picture the filling and emptying of a bathtub. Large waves, higher than 3-feet, are not to be expected in A Zones. ![]() In general, one can think of A Zones as locations that will flood, but the floodwaters will mostly rise and then slowly recede. Each are subdivided into specific categories to further designate different conditions. ![]() The Federal Emergency Management Agency (FEMA) has two designations for coastal flood zones within the 100-year flood plain - A Zones and V Zones. It can also have a major impact on the overall design of a structure in question. This assessment is crucial in determining whether a property is at risk of flooding. When building in a flood zone, it’s crucial for a property owner to conduct a proper flood risk assessment – no matter if it’s residential, commercial or industrial land. Building in a Flood Zone? Why You Should Conduct a Flood Risk Assessment Before Building ![]()
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