"I think you can always do more, so here we are with a flood that was bigger than 1953, but with many fewer homes flooded - even though of course we built lots of homes in flood plains since then.
"So, I think the figure is had there been no flood defences you could have seen 800,000 homes flooded. So there's always more that can be done.
"There's always more flood defences that can be put in place, the funding is there but you can't always protect everything."
The Prime Minister has been paying a visit to North Norfolk this morning to see for himself the extent of last week's flood damage.
David Cameron visited Wells-next-the-Sea and spoke to residents whose properties were damaged in the tidal surge. He also thanked the emergency services for their work.
Sea defences managed to prevent the devastation seen further down the coast at Hemsby and Walcott but he insisted that more needed to be done and lessons had to be learnt
David Cameron surveyed the extent of the flood damage as he visited a town hit by last week's tidal surge.Read the full story ›
David Cameron surveyed the extent of the flood damage in north Norfolk today as he visited a town hit by last week's tidal surge.
The Prime Minister met residents of Wells-next-the-Sea whose properties were damaged as the tide reached the highest level on record.
Mr Cameron paid tribute to the emergency services and flood wardens for their response, but said more could be done.
He said: "These were terrible floods and it was a very difficult event but the resilience of people here in Norfolk must be praised."
Charlie Hall, Deputy Chief Constable of Norfolk Police, said that in places the waters exceeded the levels seen in the storm surge of 1953:
In places, water levels were higher than those experienced in the flooding of 1953, when many people lost their lives.
Thankfully that has not been the case on this occasion, a combination of improved defences in place and the concerted efforts of the community, the emergency services and the agencies that have worked to support the evacuation and keep people informed.
Following a meeting of the Government's Cobra emergencies committee, Environment Secretary Owen Paterson warned that the danger was not over:
There will still be exceptionally high tides today and tomorrow and I would ask everybody to pay very close attention to advice from the Environment Agency and also to follow instructions from the police, local government and the emergency services.
The Environment Agency has updated an interactive map showing where the storm has hit hardest. It includes detail on 54 flood warnings, where there is a danger to life, along with 124 flood warnings, and 70 flood alerts.
A village in Norfolk has become the latest victim of coastal erosion after high tides swept away the lifeboat launching ramp. More than eight feet of beach has disapppeared from Hemsby near Great Yarmouth in recent days and there are concerns that more could go. Kate Prout reports.