Several areas of Caerphilly County Borough have been hit with flooding as heavy rain is set to continue for the rest of Sunday.
The Met Office earlier issued a Red Warning for rain for Storm Dennis.
Red warnings are issued when it is highly likely the weather will cause a high level of impact – including threat to life.
Storm Dennis has brought heavy rain across the UK throughout the weekend, with multiple amber and yellow warnings in force until Monday, highlighting the risk of flooding and strong winds.
Several communities in Caerphilly County Borough have been affected by flooding including Machen, Bedwas, Risca and Argoed.
Bedwas Road near Bedwas Rugby Club is closed with the Welsh Government building opposite Peters Pies flooded.
Met Office Chief Meteorologist, Andy Page, said: “Whilst the heaviest rain has cleared from Northern Ireland and Scotland, England and Wales will continue to see heavy rain on Sunday, with a risk of severe flooding in places.
“In particular, heavy rain has led to severe flooding across parts of south Wales triggering a red rain warning, where around 140mm of rain in total could fall, before it gradually eases this afternoon.”
Jeremy Parr, Head of Flood and Incident Risk Management for Natural Resources Wales, said: “The forecast is for very significant levels of rain, especially in the eastern valleys of South Wales. Impacts could be severe overnight, and everyone should take the warnings extremely seriously.
“We are working hard to make sure communities are as prepared as possible and urge people to take care and make arrangements to be safe.
“People are advised to take great care if you need to travel. If you are out, take extreme caution and never drive or walk through flood waters.
“Keep an eye on the forecast and visit our website for the latest information on flood warnings. You can find practical advice on flooding on our website too.”