Moses Juarez, left, and Anselmo Padilla wade through floodwaters from Tropical Storm Harvey on Sunday, August 27, 2017, in Houston, Texas. (Photo by David J. Phillip/AP Photo)





Residents wade through floodwaters from Tropical Storm Harvey Sunday, August 27, 2017, in Houston, Texas. (Photo by David J. Phillip/AP Photo)





A pedestrian crosses a street inundated by floodwaters from Tropical Storm Harvey on Sunday, August 27, 2017, in Houston, Texas. (Photo by Charlie Riedel/AP Photo)





A man wades through floodwaters from Tropical Storm Harvey on Sunday, August 27, 2017, in Houston, Texas. (Photo by David J. Phillip/AP Photo)





A man walks through floodwaters from Tropical Storm Harvey as he evacuates his home on Sunday, August 27, 2017, in Houston, Texas. (Photo by Charlie Riedel/AP Photo)





Waters rush from a large sinkhole on Highway FM 762 in Rosenberg, Texas, near Houston, Sunday, Aug. 27, 2017. Police say the sinkhole has opened on the Texas highway as Tropical Storm Harvey dumps more rain on the region. (AP Photo/John Mone)





Residents wade through floodwaters from Tropical Storm Harvey Sunday, August 27, 2017, in Houston, Texas. (Photo by David J. Phillip/AP Photo)





Residents wade through floodwaters from Tropical Storm Harvey Sunday, August 27, 2017, in Houston, Texas. (Photo by David J. Phillip/AP Photo)





A car is surrounded by floodwaters from Hurricane Harvey in Point Comfort, Texas, August 26, 2017. (Photo by Rick Wilking/Reuters)





A man walks through floods waters and onto the main road after surveying his property which was hit by Hurricane Harvey in Rockport, Texas, U.S. August 26, 2017. (Photo by Adrees Latif/Reuters)





Barbara Koster stands on her front door as she surveys her property which was left devastated by Hurricane Harvey in Rockport, Texas, U.S. August 26, 2017. (Photo by Adrees Latif/Reuters)





A stranded motorist escapes floodwaters on Interstate 225 after Hurricane Harvey inundated the Texas Gulf coast with rain causing mass flooding, in Houston, Texas, U.S. August 27, 2017. (Photo by Nick Oxford/Reuters)





Residents are rescued from their homes surrounded by floodwaters from Tropical Storm Harvey on Sunday, August 27, 2017, in Houston, Texas. (Photo by David J. Phillip/AP Photo)





An abandoned vehicle sits in flood waters on the I-10 highway in Houston, Texas, Sunday, Aug. 27, 2017. (AP Photo/LM Otero)





A truck pushes through floodwaters from Tropical Storm Harvey on Sunday, August 27, 2017, in Houston, Texas. (Photo by David J. Phillip/AP Photo)





Evacuees wade down a flooded section of Interstate 610 as floodwaters from Tropical Storm Harvey rise 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)





Wilford Martinez, right, is rescued from his flooded car by Harris County Sheriff's Department Richard Wagner along Interstate 610 in floodwaters from Tropical Storm Harvey on Sunday, August 27, 2017, in Houston, Texas. (Photo by David J. Phillip/AP Photo)





A man helps a woman in floodwaters from Tropical Storm Harvey Sunday, August 27, 2017, in Houston, Texas. (Photo by David J. Phillip/AP Photo)





Two kayakers try to beat the current pushing them down an overflowing Brays Bayou along S. Braeswood in Houston, Texas, Sunday, August 27, 2017. Rescuers answered hundreds of calls for help Sunday as floodwaters from the remnants of Hurricane Harvey climbed high enough to begin filling second-story homes, and authorities urged stranded families to seek refuge on their rooftops. (Photo by Mark Mulligan/Houston Chronicle via AP Photo)





Two people walk down a flooded section of Interstate 610 in floodwaters from Tropical Storm Harvey on Sunday, August 27, 2017, in Houston, Texas. (Photo by David J. Phillip/AP Photo)





A rescue helicopter hovers in the background as an elderly woman and her poodle use an air mattress to float above flood waters from Tropical Storm Harvey while waiting to be rescued from Scarsdale Boulevard in Houston, Texas on August 28, 2017. (Photo by Adrees Latif/Reuters)





Interstate Highway 45 is submerged in Houston on August 28, 2017. (Photo by Richard Carson/Reuters)





People walk through water to a staging area to evacuate in Dickinson, Texas on August 27, 2017. (Photo by Rick Wilking/Reuters)





Jesus Rodriguez rescues Gloria Garcia after rain flooded Pearland, in the outskirts of Houston on August 27, 2017. (Photo by Adrees Latif/Reuters)





People are rescued from flood waters from Hurricane Harvey on an air boat in Dickinson, Texas on August 27, 2017. (Photo by Rick Wilking/Reuters)





Area residents use a kayak to rescue motorists stranded on Interstate Highway 45 in Houston on August 27, 2017. (Photo by Richard Carson/Reuters)





Residents use a truck to navigate through flood waters in Houston on August 28, 2017. (Photo by Adrees Latif/Reuters)





People stand on a sinking boat awaiting rescue from a U.S. Coast Guard helicopter, after Hurricane Harvey passed near Port Aransas, Texas on August 26, 2017. (Photo by Petty Officer 2nd Class Cory Mendenhall/Reuters/U.S. Coast Guard)





Texas Guardsmen from the 386th Engineer Battalion pick up large debris in Victoria, Texas. U.S. on August 27, 2017. (Photo by Capt. Martha Nigrelle/Reuters/Army National Guard)





Boats pushed ashore in Port Lavaca on August 26, 2017. (Photo by Rick Wilking/Reuters)





A plane lies upside down at the airport near Fulton on August 26, 2017. (Photo by Rick Wilking/Reuters)





A resident picks up debris from the road the morning after in Rockport on August 26, 2017. (Photo by Adrees Latif/Reuters)





A car crushed by a huge tree in Rockport on August 26, 2017. (Photo by Rick Wilking/Reuters)





A cow struggles to keep its head above floodwaters near Fulton on August 26, 2017. (Photo by Rick Wilking/Reuters)





Stewart Adams, of San Marcos, Texas, plays in the wind in Corpus Christi on August 26, 2017. (Photo by Adrees Latif/Reuters)





Wilford Martinez, right, is rescued from his flooded car along Interstate 610 in floodwaters from Tropical Storm Harvey Sunday, August 27, 2017, in Houston, Texas. (Photo by David J. Phillip/AP Photo)





People make their way down partially flooded roads following the passage of Hurricane Harvey on August 26, 2017 in Galveston, Texas. (Photo by Brendan Smialowski/AFP Photo)





Ashley Ward kayaks down a flooded street that has been 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)