This photograph shows the rising water levels at Berthon Brook in Little Mill near Usk.
The Met Office forecasts the heavy rain to continue into tonight, although brighter weather is expected for much of Wales on Thursday.
A 69-year-old woman has died in a car crash on the A449 in Monmouthshire.
Officers from the fire and ambulance service attended and dealt with the collision yesterday afternoon, which involved one vehicle.
The road between Raglan and Usk was closed southbound to allow emergency services to attend the scene - buy has now re-opened.
Another person was treated for minor injuries at the Royal Gwent Hospital in Newport.
Anyone who saw the crash is asked to ring Gwent Police on 101 quoting log 419 27/12/13.
A man who was killed when the van he was travelling in collided with a lorry on the A449 has been identified as 20-year-old Robert Smith, from Bridgend.
His family said: "Robert was a wonderful son to Garry and Catherine, he was a loving big brother to Andrew (aged 18), grandson, uncle, boyfriend, nephew and cousin, as well as a good friend and colleague to many."
"He will be so sadly missed by everyone that knew him and his death will leave a large void in many people’s lives."
A 47-year-old man from Bridgend, travelling with Robert in the van, remains in a critical condition in hospital in Cardiff.
The driver of the HGV, a 57-year-old man from the Birmingham area, suffered minor injuries and has veen released from hospital.
Gwent Police is still investigating the collision, which happened just after 2pm on Monday on the A449 between Usk and Newport.
Officers are asking anyone who may have witnessed the crash to call 101.
The death of a man whose body was found on Saturday morning in Undy, Usk is being treated as "unexplained" by police.
Gwent Police were called shortly after 10am , after the man - whose identity has not yet released - was discovered in a reen of water opposite Undy Police Station.
A police spokesperson said the death is not being treated as suspicious.
One lane is closed after an accident on the A449 Southbound between the A472 (Usk Interchange) and the M4 J24 / A48 (Coldra).
All lanes are open and traffic's returned to normal after the accident on the A449 Southbound between the A472 (Usk Interchange, Usk) and the M4 J24 / A48 (Coldra, Newport).
Gwent Police announce that they have located and arrested William Philip Goldie, who was found to be missing from HMP Prescoed, Usk, yesterday.
Mr Goldie, 22, was found in the Gloucestershire area. He has now being returned to the prison.
Police are searching for a 22 year-old man who has fled Prescoed Prison, near Usk.
William Philip Goldie is described as being 6ft tall and of slight build. He has short brown hair and blue eyes.
In 2009, Goldie was convicted of possession of controlled drugs with intent to supply and sentenced to 30 months in prison.
Police say he has links to the Gloucester area, and have asked anyone with information to contact them on 01633838111, or Crimestoppers on 0800 5551111.