What designation is given to areas behind recognized levees on FIRM?

The designation given to areas behind recognized levees on the Flood Insurance Rate Map (FIRM) is the Shaded Zone X. This area generally indicates that it is outside the Special Flood Hazard Area (SFHA) and is considered to have a lower risk of flooding. The Shaded Zone X designation is particularly significant because it reflects careful analysis of the levee’s capability and flood risk, suggesting that while there is reduced risk compared to areas marked as flood zones, there is still some potential for flooding under certain conditions.

In contrast, Flood Zone A refers to areas subject to inundation by a 1% annual chance flood event (also known as the base flood), while Special Flood Hazard Areas typically include those zones where more stringent floodplain management and insurance requirements apply. Risk Zone B involves areas with a moderate flood risk but is not as specifically defined as areas behind recognized levees.

Thus, the Shaded Zone X effectively communicates the potential for reduced flood risk while acknowledging that the effectiveness of levees can vary, helping property owners make informed decisions about flood insurance and management.