Hurricane Katrina, a unsafe tropical storm that hit the south-eastern United States in late August 2005, caused destructive floods in New Orleans and neighbouring communities, killing approximately 1,800 people.
Louisiana's Governor John Bel Edwards asked President Donald Trump for a federal emergency declaration for Louisiana.
"There are so many areas that have been hit by devastating winds and now the massive flooding, and insurance adjusters are having to wait for first responders to simply check on the safety and welfare of citizens", said Mark Hanna of the Insurance Council of Texas. With more heavy rain expected to drench the region in the coming days, the National Weather Service tweeted yesterday (Aug. 27): "This event is unprecedented & all impacts are unknown & beyond anything experienced".
"The National and State Guard have deployed 3,000 guard members", Abbott said. They say they have already rescued 100 people from the air.
The carriers each say that both prepaid and postpaid plans in Houston and surrounding parts of Texas and Louisiana will have some or all of their costs waived.
Even officials with the Mexican government have offered Texas assistance in its recovery from the storm, Abbott said at a news conference Monday.
In addition, 35 boats and 93 dump trucks were being used by the city for high water rescues. Four children - Daisy Saldivar, 6; Xavier Saldivar, 8; Dominic Saldivar, 14; Devy Saldivar, 16 - were in the white van, along with their great-grandparents, Manuel Saldivar, 84, and his wife Belia, 81.
Harvey's center was in the Gulf of Mexico about 105 miles (170 km) south of Houston and forecast to arc slowly toward the city through Wednesday, adding more rain to areas already inundated.
Speaking in Washington as he prepared to visit the flood zone, Mr Trump pledged "rapid action" from Congress, as he promised funding for the victims of Tropical Storm Harvey. Trump says protecting American lives is his top priority as Harvey continues to pound the U.S. Gulf Coast.
"But we would need 36 hours to evacuate all those people, and you can't predict that far out", he said.
Meanwhile, more evacuations have been ordered around Houston due to rapidly rising water levels in creeks and rivers.
Numerous families affected by the floods also were flooded out in 2016 and 2015. 300,000 people were left without power as of Monday, as many sought refuge in shelters.
A home is surrounded by floodwaters from Tropical Storm Harvey on Monday, Aug. 28, 2017, in Spring, Texas.
The city of Houston had received some 56,000 calls to 911 as of mid-day Sunday.
'Going through Katrina, it hurts to say that this is worse. For one, there is the scope of the flooding. Harris and Fort Bend county officials advised residents to pack their cars Sunday night and leave Monday morning. "There will be mold and structural damages adding up". "You really can't narrow down an area that's in danger".
With emergency dispatchers overwhelmed by rescues and tens of thousands displaced in shelters, many have spoken out in support of Texas and encourage donations to various relief efforts.