Texas Governor Greg Abbott has said "the worst is not yet over" for the south-east of the US state, after devastating Tropical Storm Harvey.
Rain continues to fall, he said, and flooding in certain areas may last another week.
More than 20 people are reported dead and large parts of Houston, Port Arthur and Beaumont are under water.
The storm has weakened into a depression as it moves to Louisiana, where there is also flooding.
Texas has carried out more than 8,500 rescues and more than 32,000 people remain in shelters throughout the state, Governor Abbott said.
Another 10,000 members of the National Guard are said to be on their way, joining the 14,000 already deployed to tackle the disaster.
- READ FROM BBC Child found clinging to dead mum in storm
The National Weather Service said the coastal Cedar Bayou area had recorded a rainfall of nearly 52in (132cm) since Friday, which is a continental US record.
However, meteorologists say much drier weather is forecast for Texas in the days ahead.
Authorities and volunteers are still battling to rescue stranded people.
READ: Family of six Death toll
The sheriff's office in Harris County has confirmed a family of six - two great-grandparents and four children - drowned while trying to flee the floods in a van.
Among them was 16-year-old Devy Saldivar, who had posted an anxious Facebook message about the extreme weather on Sunday: "No sleep & anxiety, please let this pass sooner."
"Our worst fears have been realised," said Sheriff Ed Gonzalez, breaking the news.
The driver, the son of the elderly couple, was able to escape and was found clinging to a tree, screaming for help, he said.
Authorities are reminding people not to drive - many of the casualties happened on the roads as people underestimated the power of the water.
Family of Six, Death toll
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