Rescuers pluck hundreds from rising floodwaters in Houston

Houston and its suburbs could receive as much as 50 inches (1.3 metres) of rain. That would be the highest amount ever recorded in Texas.

Some areas have already received about half that amount. Since Thursday, South Houston had received nearly 25 inches (63 centimetres) and the suburbs of Santa Fe and Dayton got 27 inches (69 centimetres).

“The breadth and intensity of this rainfall is beyond anything experienced before,” the National Weather Service said in a statement.

Average rainfall totals will end up around 40 inches (1 metre) for Houston, weather service meteorologist Patrick Burke said.

The 18 counties now under a federal disaster declaration represent about a quarter of the Texas population, or 6.8 million people.

The director of the Federal Emergency Management Agency, Brock Long, said the government expected to conduct a “mass care mission” and predicted that the aftermath of the storm would require FEMA’s involvement for years.

“This disaster’s going to be a landmark event,” Long said.

Rescuers had to give top priority to life-and-death situations, leaving many affected families to fend for themselves. The city’s main convention centre was quickly opened as a shelter.

Gillis Leho arrived there soaking wet. She said she awoke Sunday to find her downstairs flooded. She tried to move some belongings upstairs, then grabbed her grandchildren.

“When they told us the current was getting high, we had to bust a window to get out,” Leho said.

Harris County Sheriff Ed Gonzalez used Twitter to field calls for assistance. Among those seeking help was a woman who posted: “I have 2 children with me and the water is swallowing us up.”

Some people used inflatable beach toys, rubber rafts and even air mattresses to get through the water to safety. Others waded while carrying trash bags stuffed with their belongings and small animals in picnic coolers.

Houston Mayor Sylvester Turner said authorities had received more than 2,000 calls for help, with more coming in. He urged drivers to stay off flooded roads to avoid adding to the number of those stranded.

“I don’t need to tell anyone this is a very, very serious and unprecedented storm,” Turner told a news conference. “We have several hundred structural flooding reports. We expect that number to rise pretty dramatically.”

The mayor defended his decision not to ask residents to evacuate before the heavy rain from Harvey swamped roads and neighbourhoods. He said there was no way to know which areas were most vulnerable.

“If you think the situation right now is bad, and you give an order to evacuate, you are creating a nightmare,” he said, citing the risks of sending the city’s 2.3 million inhabitants onto the highways at the same time.

Rainfall of more than four inches per hour resulted in water levels higher than in any recent floods and higher than during Tropical Storm Allison in June 2001, said Jeff Linder of flood control district in Harris County, which includes Houston.

For those trying to escape, rescue came by land, water and air.