What is the Coastal High Hazard Area (CHHA)?

The Coastal High Hazard Area (CHHA) is defined as the region that extends from the offshore limit of a specified coastal zone to the primary frontal dune. This area is particularly vulnerable to high-velocity wave action during coastal storms, including hurricanes, which can result in significant flooding and property damage. Identifying this area is crucial for land-use planning, zoning, and the implementation of construction standards designed to minimize risks associated with coastal hazards. Understanding the boundaries of the CHHA helps ensure that structures are built to withstand the potential effects of storm surges and high waves. This is why the choice that accurately indicates the extent of the CHHA is the correct one.

The other options do not capture the full scope of the CHHA. Areas with minimal wave action or that are only influenced by tides do not represent the high-risk nature of the CHHA, and an area protected from storm surges is counter to the definition of CHHA, which inherently deals with areas that are not fully protected and are therefore at risk during hazardous weather events.