Downtown Houston is seen behind the flooded Buffalo Bayou a few days after Hurricane Harvey came ashore in August 2017. The Category 4 storm caused historic flooding. It set a record for the most rainfall from a tropical cyclone in the continental United States, with 51 inches of rain recorded in areas of Texas. An estimated 27 trillion gallons of water fell over Texas and Louisiana during a six-day period.
Downtown Houston is seen behind the flooded Buffalo Bayou a few days after Hurricane Harvey came ashore in August 2017. The Category 4 storm caused historic flooding. It set a record for the most rainfall from a tropical cyclone in the continental United States, with 51 inches of rain recorded in areas of Texas. An estimated 27 trillion gallons of water fell over Texas and Louisiana during a six-day period.
Paul Jordan Anderson/DoubleHorn Photography
NASA astronaut Jack Fischer photographed Hurricane Harvey from the International Space Station.
NASA astronaut Jack Fischer photographed Hurricane Harvey from the International Space Station.
Jack Fischer/NASA
Steve Culver comforts his dog Otis in the hurricane aftermath. Harvey destroyed most of his home in Rockport while he and his wife were there.
Steve Culver comforts his dog Otis in the hurricane aftermath. Harvey destroyed most of his home in Rockport while he and his wife were there.
Joe Raedle/Getty Images
Houston police officer Daryl Hudeck carries Catherine Pham and her 13-month-old son, Aiden, after rescuing them from floodwaters.
Houston police officer Daryl Hudeck carries Catherine Pham and her 13-month-old son, Aiden, after rescuing them from floodwaters.
David J. Phillip/AP
A damaged home is seen in the Key Allegro neighborhood of Rockport.
A damaged home is seen in the Key Allegro neighborhood of Rockport.
William Luther/San Antonio Express-News via ZUMA Wire
A car is submerged by floodwaters on a freeway near downtown Houston.
A car is submerged by floodwaters on a freeway near downtown Houston.
Charlie Riedel/AP
Melani Zurawski cries while inspecting her home in Port Aransas, Texas.
Melani Zurawski cries while inspecting her home in Port Aransas, Texas.
Nick Wagner/Austin American-Statesman via AP
A graveyard is flooded in Pearland, Texas.
A graveyard is flooded in Pearland, Texas.
BRENDAN SMIALOWSKI/AFP/Getty Images
Soldiers with the National Guard patrol Rockport, looking for residents trapped in their homes.
Soldiers with the National Guard patrol Rockport, looking for residents trapped in their homes.
Timothy Fadek/Redux for CNN
Evacuees are loaded onto a truck in Houston.
Evacuees are loaded onto a truck in Houston.
BRENDAN SMIALOWSKI/AFP/Getty Images
People push a stalled pickup through a flooded street in Houston.
People push a stalled pickup through a flooded street in Houston.
Charlie Riedel/AP
Rockport residents return to their destroyed home.
Rockport residents return to their destroyed home.
Timothy Fadek/Redux for CNN
Rescue boats fill Tidwell Road in Houston as they help flood victims evacuate the area.
Rescue boats fill Tidwell Road in Houston as they help flood victims evacuate the area.
David J. Phillip/AP
People wait to be rescued from their flooded home in Houston.
People wait to be rescued from their flooded home in Houston.
Joe Raedle/Getty Images
Volunteers in Dallas organize items donated for hurricane victims.
Volunteers in Dallas organize items donated for hurricane victims.
Tony Gutierrez/AP
When Harvey slammed the Texas coast and flooded much of Houston, <a target="_blank">volunteers sprang into action.</a> Some came from as far away as the Florida Everglades, boats in tow, ready to rescue people trapped in their homes.
When Harvey slammed the Texas coast and flooded much of Houston, volunteers sprang into action. Some came from as far away as the Florida Everglades, boats in tow, ready to rescue people trapped in their homes.
Timothy Fadek/Redux for CNN
Larry Koser Jr. and his son Matthew look for important papers and heirlooms inside a flooded home in Houston.
Larry Koser Jr. and his son Matthew look for important papers and heirlooms inside a flooded home in Houston.
Erich Schlegel/Getty Images
Members of the National Guard rest at a furniture store in Richmond, Texas.
Members of the National Guard rest at a furniture store in Richmond, Texas.
Alyssa Schukar/The New York Times/Redux Pictures
Volunteer rescue workers help a woman from her flooded home in Port Arthur, Texas.
Volunteer rescue workers help a woman from her flooded home in Port Arthur, Texas.
Joe Raedle/Getty Images
This aerial photo shows flooded residential neighborhoods in Houston.
This aerial photo shows flooded residential neighborhoods in Houston.
Marcus Yam/Los Angeles Times/Getty Images
Tammy Dominguez and her husband, Christopher, sleep on cots at the George R. Brown Convention Center, where thousands of people were taking shelter in Houston.
Tammy Dominguez and her husband, Christopher, sleep on cots at the George R. Brown Convention Center, where thousands of people were taking shelter in Houston.
Michael Ciaglo/Houston Chronicle/AP
An elderly patient waits to be rescued from the Gulf Health Care Center in Port Arthur. The facility was evacuated with the help of first responders and volunteers.
An elderly patient waits to be rescued from the Gulf Health Care Center in Port Arthur. The facility was evacuated with the help of first responders and volunteers.
Nick Oza/USA Today Network/Sipa USA