The Environment Agency has more than 60 Flood Warnings and Flood Alerts in force across the Anglia region.
Although the rain has turned showery, more is forecast during Sunday.
A video taken by ITV News Anglia viewer Rob Simpson of the River Stour in flood, blocking Liston Lane in Long Melford, Suffolk.
The region's emergency services say drivers are putting themselves in danger by ignoring road signs and driving through flood water.
A driver has been describing the moment his van was swept away by flood waters in Much Hadham, Hertfordshire.
Floods have hit parts of the region, putting homes at risk and leaving motorists stranded in their cars.