Travel continues to be disrupted across the UK, with some A-roads closed and train lines disrupted.
The Environment Agency said more than 400 properties had been flooded after Storm Dennis brought torrential rain and strong winds to the UK.
John Curtin, the Environment Agency's head of floods and coastal management, said on Twitter that number was "likely to rise" - but indicated figures were lower than those for Storm Ciara earlier this month.
Several schools have been closed and roads remain blocked by floods and landslips.
Jeanette Cox said the only surviving object on the bottom floor of her home the village of Nantgarw, near Cardiff, was a wedding photograph of her and her late husband.
Mrs Cox, 68, said it was "terrifying" to discover water at the bottom of the stairs in the early hours of Sunday morning.
She and her daughter Rachel were evacuated but returned home on Monday morning to assess the scale of the damage.
"The water has moved things I didn't think could move. I think there are just two cupboards standing - the rest is gone," Mrs Cox said.
In Worcestershire, police searching for a woman who was swept away in floodwater near Tenbury Wells said it has become "a recovery rather than a rescue operation".
The search was suspended overnight as fast-flowing water made conditions "extremely challenging", chief superintendent Tom Harding of the West Mercia Police said.
A relief centre for displaced residents has been set up at the high school in the town, where around 130 properties were evacuated on Sunday.
Response teams worked into the early hours of Monday morning to rescue stranded residents from their homes by boat.
The county council has warned that more evacuations could be necessary.
In Staffordshire, serious flooding cause a youth climate strike conference to be called off.
The first ever national conference was due to start on Sunday afternoon, with delegates travelling from across the UK.
But police advised the event should be cancelled after heavy rain made roads around the venue impassable, the UK Student Climate Network said.
Sophia Coningham, 15, from London, said there was a "bleak irony" in being beaten back by climate change.
Downing Street said Prime Minister Boris Johnson will receive "regular updates" on the flooding, which it described as "terrible".
It added that the government has deployed three miles (5km) of flood barriers, 1,000 Environment Agency staff and the military.
The government has activated an emergency funding scheme for areas affected by the flooding, which include parts of Nottinghamshire, Leicestershire, Derbyshire, Shropshire, Telford and Wrekin, Worcestershire and Herefordshire.
Under the Bellwin scheme, local authorities can apply for the government to reimburse non-insurable costs above a certain threshold, which has not been specified.
Also on Sunday, Storm Dennis caused flights and train services to be cancelled and roads to be closed, and a man was rescued from the Teme in Worcestershire and taken to hospital by ambulance, police said.