Rescue crews search for people in distress after Hurricane Harvey caused heavy flooding in Houston, Texas on August 27, 2017. Massive flooding unleashed by deadly monster storm Harvey left Houston – the fourth-largest city in the United States – increasingly isolated as its airports and highways shut down and residents fled homes waist-deep in water. (Photo by Mark Ralston/AFP Photo)





An overhead view of the flooding in Houston, from Buffalo Bayou on Memorial Drive and Allen Parkway, as heavy rains continued falling from Tropical Storm Harvey, Monday, August 28, 2017, in Houston. Houston was still largely paralyzed Monday, and there was no relief in sight from the storm that spun into Texas as a Category 4 hurricane, then parked itself over the Gulf Coast. (Photo by Karen Warren/Houston Chronicle via AP Photo)





Houston Police SWAT officer Daryl Hudeck carries Catherine Pham and her 13-month-old son Aiden after rescuing them from their home surrounded by floodwaters from Tropical Storm Harvey Sunday, August 27, 2017, in Houston. The remnants of Hurricane Harvey sent devastating floods pouring into Houston Sunday as rising water chased thousands of people to rooftops or higher ground. (Photo by David J. Phillip/AP Photo)





A man walks to his home in a neighborhood inundated by floodwaters from Tropical Storm Harvey on Monday, August 28, 2017, in Houston, Texas. (Photo by Charlie Riedel/AP Photo)





A man helps children across a flooded street as they evacuate their home after the area was inundated with flooding from Hurricane Harvey on August 27, 2017 in Houston, Texas. Harvey, which made landfall north of Corpus Christi late Friday evening, is expected to dump upwards to 40 inches of rain in Texas over the next couple of days. (Photo by Joe Raedle/Getty Images)





A graveyard is seen as it floods during the aftermath of Hurricane Harvey August 27, 2017 in Pearland, Texas. Hurricane Harvey left a trail of devastation Saturday after the most powerful storm to hit the US mainland in over a decade slammed into Texas, destroying homes, severing power supplies and forcing tens of thousands of residents to flee. (Photo by Brendan Smialowski/AFP Photo)





A drives moves through flood waters left behind by Hurricane Harvey, Saturday, August 26, 2017, in Aransas Pass, Texas. Harvey rolled over the Texas Gulf Coast on Saturday, smashing homes and businesses and lashing the shore with wind and rain so intense that drivers were forced off the road because they could not see in front of them. (Photo by Eric Gay/AP Photo)





In this Sunday, August 27, 2017, photo provided by Trudy Lampson, residents of the La Vita Bella nursing home in Dickinson, Texas, sit in waist- deep flood waters caused by Hurricane Harvey. Authorities said all the residents were safely evacuated from the facility. (Photo by Trudy Lampson via AP Photo)





A submerged car is seen on Interstate 610 North on August 27, 2017 in Houston as the city battles with tropical storm Harvey and resulting floods. (Photo by Thomas B. Shea/AFP Photo)





After helping the driver of the submerged truck get to safety, a man floats on the freeway flooded by Tropical Storm Harvey on Sunday, August 27, 2017, near downtown Houston. (Photo by Charlie Riedel/AP Photo)





Mari Zertuche walks through a flooded parking lot on the campus of Rice University afer it was inundated with water from Hurricane Harvey on August 27, 2017 in Houston, Texas. Harvey, which made landfall north of Corpus Christi late Friday evening, is expected to dump upwards to 40 inches of rain in areas of Texas over the next couple of days. (Photo by Scott Olson/Getty Images)





A man carries his belonging as he walks through the flooded waters on Telephone Rd. in Houston on August 27, 2017 as the US fourth city city battles with tropical storm Harvey and resulting floods. (Photo by Thomas B. Shea/AFP Photo)





Stranded vehicles sit where they got stuck in high water from Hurricane Harvey on Dairy Ashford Drive, August 28, 2017 in Houston, Texas. Harvey made landfall shortly after 11 p.m. Friday, just north of Port Aransas as a Category 4 storm and is being reported as the strongest hurricane to hit the United States since Wilma in 2005. (Photo by Erich Schlegel/Getty Images)





Joe Garcia carries his dog Heidi from his flooded home as he is rescued from rising floodwaters from Tropical Storm Harvey on Monday, August 28, 2017, in Spring, Texas. (Photo by David J. Phillip/AP Photo)




Alexendre Jorge evacuates Ethan Colman, 4, from a neighborhood inundated by floodwaters from Tropical Storm Harvey on Monday, August 28, 2017, in Houston, Texas. (Photo by Charlie Riedel/AP Photo)





Interstate highway 45 is submerged during widespread flooding in Houston, Texas on August 28, 2017. (Photo by Richard Carson/Reuters)





Domenique Scales (C), wipes tears from her face after being rescued from the flood waters in Beaumont Place, Houston, Texas on August 28, 2017. (Photo by Jonathan Bachman/Reuters)





Destyn Scales and her dog Dexter wade through flood waters in Beaumont Place, Houston, Texas on August 28, 2017. (Photo by Jonathan Bachman/Reuters)





People are evacuated by a high water vehicle in Dickinson, Texas on August 28, 2017. (Photo by Rick Wilking/Reuters)





Residents use boats to evacuate flood waters along Tidwell Road in east Houston, Texas on August 28, 2017. (Photo by Adrees Latif/Reuters)





Vehicles sits half submerged in flood waters under a bridge in Houston, Texas on August 28, 2017. (Photo by Ernest Scheyder/Reuters)





Isiah Courtney carries his dog Bruce through flood waters in Beaumont Place, Houston, Texas on August 28, 2017. (Photo by Jonathan Bachman/Reuters)





Men use kayaks to get through an intersection in Pearland, in the outskirts of Houston, Texas on August 27, 2017. (Photo by Adrees Latif/Reuters)





A man carries his belongings through flood waters in Houston, Texas on August 28, 2017. (Photo by Nick Oxford/Reuters)





Members of the Duong family walk through flood waters on the feeder road of Interstate 45 in Houston, Texas on August 28, 2017. (Photo by Adrees Latif/Reuters)





Evacuees are transported to the George R. Brown Convention Center in Houston, Texas on August 27, 2017. (Photo by Nick Oxford/Reuters)





Residents wade through flood waters from Tropical Storm Harvey in Beaumont Place, Houston, Texas on August 28, 2017. (Photo by Jonathan Bachman/Reuters)