Definition of Highest astronomical tide (HAT):
The highest level which can be predicted to occur under average meteorological conditions.
This is the common definition for Highest astronomical tide (HAT), other definitions can be discussed in the article
HAT is not the most extreme level that can be reached by the tide, as storm surges may cause considerably higher levels to occur.
- ↑ CIRIA (1996). Beach management manual. CIRIA Report 153.
- Lowest astronomical tide