The Acqua Atla is the term describing the temporary flooding of Venice because of the rising of Adriatic Sea tide. The event is called Acqua Atla when the sea level rises over 90 cm. This phenomenon existed since before the middle ages. It was recorded for the first time in the sixth century. It happens around 100 times a year.
The unprecedented and strong Acqua Alta events in Venice in 2019 has contributed to an unusually high mean sea level, a high spring tide and extreme local and regional weather conditions. Water levels rose to 1.89 meters, the highest ever recorded since 1966. It had flooded nearly half of the city between November 11 and 18, 2019.