Houston’s recovery from Hurricane Harvey flooding will be a “multi-year project”, Texas Governor Greg Abbott has said.
“This is going to be a massive, massive clean-up process,” he told the ABC News programme Good Morning America.
President Donald Trump is to propose an initial $5.9bn (£4.56bn) for recovery efforts, but the Texas authorities say the state might need more than $125bn.
More than 40 people have died in the storm and its aftermath.
Recovery efforts in Houston are under way as the water recedes but search-and-rescue teams continued their work in the nearby city of Beaumont, Mr Abbott said on Friday.
Officials in Beaumont, a city of about 120,000 people near the Louisiana border, said Harvey’s flooding has cut off their drinking water supply.
Brad Penisson, a captain with the Beaumont fire and rescue department, said on Friday the city was setting up water distribution stations to ensure residents had clean drinking water.
Harvey made initial landfall as a Category 4 Hurricane in Texas last Friday, and has since dumped an estimated 20 trillion gallons of rain on the Houston area. It was later downgraded to a tropical storm but continued to batter Texas with rain.
An estimated 93,942 homes in Texas have been damaged or destroyed in the wake of Harvey, according to the Texas Division of Emergency Management. About 80% of Texans do not have flood insurance to cover the wreckage.
The storm has displaced thousands and about 32,000 people remain in shelters across the state, Mr Abbott said.
Visiting Texas, Vice-President Mike Pence on Thursday promised federal help to “rebuild bigger and better than ever before”.
The BBC’s Barbara Plett Usher in Houston says Congress is expected to act quickly on the request for initial funding when it reconvenes next week after its August recess.
But, she adds, that will be only the first tranche of money needed for the recovery.
Mr Pence said 311,000 people had registered for disaster assistance. It is not yet clear how quickly funds might reach victims.
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