Subsidence and eustatism also contribute to the phenomenon of high water.
The eustatism, i.e. the sea-level rising, is linked to climatic variations of the globe: from the beginning of the last century to the ’70s, the eustatic rise in Venice was 9 cm. Since 1970 the increase observed in Trieste, and thus independent of local subsidence, was approximately 5 cm.
These two processes have contributed to the change in mean sea level, which currently is about 26 cm (average of a recent period of ten years) higher than it was in 1897. The graph below represents the change of the sea level in Venice and Trieste from 1890 to 2015. In 2010 was reached a value of 40.1 cm, the highest ever recorded.