If a building in an A Zone is elevated above the Base Flood Elevation (BFE), where should the height measurement begin?

In the context of floodplain management and elevation standards, the height measurement for buildings located in an A Zone should begin at the top of the lowest floor. This is crucial because the purpose of the elevation requirement is to ensure that the lowest floor is adequately above the Base Flood Elevation (BFE), reducing the risk of flood damage.

The lowest floor refers specifically to the lowest habitable area of the structure, which is critical in determining how well the building is protected from flooding. Elevations are measured from this point because it is the threshold that impacts whether the building meets local floodplain management requirements and how it is rated for flood insurance purposes.

Understanding this measurement method is essential for compliance with the National Flood Insurance Program (NFIP) and for making informed decisions regarding construction in flood-prone areas. The other measurement points, such as the bottom of the foundation, highest point of the roof, or average grade around the building, do not reflect the required standard for evaluating flood risk and compliance in an A Zone.