Storm saw Thames Barrier stand up to its biggest tide
Last week's storm along the east coast of England caused water levels of over five metres above normal.
It saw the Thames Barrier's 125th and 126th closure, but its biggest test since being built in 1983.
Photos released by the Environment Agency on Tuesday showed the difference in the height of the water either side of the barrier last Thursday.
The measurement of 4.10m above normal was made at Southend during the storm.
Andy Batchelor, operations manager at the Thames Barrier, said: "Our teams at the Thames Barrier and along the east coast worked tirelessly throughout the incident, operating gates and structures and checking that flood defences and barriers were in good working order.
"I'm pleased to be able to say that once again the Thames Barrier carried out its vital role of protecting London from flooding."
The agency released an image (below) last Friday showing the devastation that could have been caused to east London and Greenwich if the barrier had not been closed.