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The inflatable barriers are supposed to protect the city from tides as high as three metres.
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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.
Vast piles of debris, collapsed roads and sunken boats are among the damage shown in the video.
Here is our lunchtime round-up of the key stories around Europe.
Watch: The waters of the flash flood reached a height of 2.5 metres and filled the Raganello gorge in Pollino National Park, sweeping tourists along the rush of water.
Emergency services in southern Italy are continuing their search of a gorge in Calabria that flooded on Monday killing at least ten people
Emergency services responded to residents stranded by the extreme weather
Six people have died after torrential rain triggered severe flooding across parts of central Italy
Flooding caused by torrential rain in northern Italy has claimed at least one victim while five people are still missing, according to local authorities.
A state of disaster has been declared in two regions after severe flooding that has left at least one person dead and others missing.
Little more than two weeks after Italian scientists warned that climate change had put much of the country at risk of flooding, parts of the northwest have been inundated by heavy…
A cyclone has swept across Southern Italy, flooding villages and roads. Amateur video showed half-submerged cars on the outskirts of Taormina in
Violent storms triggered floods in the southern Italian region of Calabria on August 12.
In the city of Rossano, roads and homes were flooded while
Serious flooding around the Arno River has swamped the Italian cities of Pisa and Florence in Friday.
#Volterra crolla 30 metri di mura etrusche