The inflatable barriers are supposed to protect the city from tides as high as three metres.
A plumed angel dressed in an orange ball gown descended from the bell tower high above the Venice lagoon down into a crowd of thousands packed into St. Mark's Square for the annual carnival "flight of the angel" ceremony Sunday
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In Pisa, in north-western Italy, 170 paratroopers were deployed to bolster the city's flood defences.
St. Mark's Square in Venice was awash with water and closed on Sunday as city authorities prepared for another exceptional high tide just days after devastating flooding.
Venice faced a new high tide on Sunday (November 17), a few days after the lagoon city suffered the worst flooding in more than 50 years.
Venice has been hit with another round of flooding on Friday just days after it experienced its worst high tide in more than half a century.
In 1984, Italy launched a flood barrier project called Mose. It was supposed to protect the lagoon city of Venice from high tides.
The mayor of Venice is set to declare a state of disaster after the city was flooded during the highest tide in over half a century.
Tourists needed some pretty high boots on Tuesday (November 12) in Venice as water levels rose flooding central St. Mark's square.