This Environment Agency picture shows the effects that the largest tidal surge in 60 years would have had on London if the Thames Barrier hadn't been closed.
Thousands of people were evacuated from their homes down the east coast of the country during storms last week.
But the 520 metre barrier saved London from the worst effects when it was shut on Thursday and Friday.
More top news
Every Christmas gets a bit more desperate for one dog at Battersea. Can you help?
The problem has meant that no trains are able to run through Gatwick Airport rail station in West Sussex.
Schoolchildren found Eragon wearing a Christmas jumper in the bag filled with dog food, treats and a tear-jerking note, in a church.