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HOUSTON, TX - AUGUST 29: Rescue workers and volunteers help residents make their way out of a flooded neighborhood after it was inundated with rain water following Hurricane Harvey on August 29, 2017 in Houston, Texas. Harvey, which made landfall north of Corpus Christi August 25, has dumped nearly 50 inches of rain in and around areas Houston. (Photo by Scott Olson/Getty Images)

HOUSTON, TX - AUGUST 29:  Rescue workers and volunteers help residents make their way out of a flooded neighborhood after it was inundated with rain water following Hurricane Harvey on August 29, 2017 in Houston, Texas. Harvey, which made landfall north of Corpus Christi August 25, has dumped nearly 50 inches of rain in and around areas Houston.  (Photo by Scott Olson/Getty Images)

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HOUSTON, TX - AUGUST 27: Volunteers and officers from the neiborhood security patrol help to rescue residents and their dogs in the upscale River Oaks neighborhood after it 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 Scott Olson/Getty Images)

HOUSTON, TX - AUGUST 27:  Volunteers and officers from the neiborhood security patrol help to rescue residents and their dogs in the upscale River Oaks neighborhood after it 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 Scott Olson/Getty Images)

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HOUSTON, TX - AUGUST 29: People make their way out of a flooded neighborhood after it was inundated with rain water following Hurricane Harvey on August 29, 2017 in Houston, Texas. Harvey, which made landfall north of Corpus Christi August 25, has dumped nearly 50 inches of rain in and around areas Houston. (Photo by Scott Olson/Getty Images)

HOUSTON, TX - AUGUST 29:  People make their way out of a flooded neighborhood after it was inundated with rain water following Hurricane Harvey on August 29, 2017 in Houston, Texas. Harvey, which made landfall north of Corpus Christi August 25, has dumped nearly 50 inches of rain in and around areas Houston.  (Photo by Scott Olson/Getty Images)

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HOUSTON, TX - AUGUST 28: People make their way out of a flooded neighborhood after it was inundated with rain water, remnants of Hurricane Harvey, on August 28, 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)

HOUSTON, TX - AUGUST 28:  People make their way out of a flooded neighborhood after it was inundated with rain water, remnants of Hurricane Harvey, on August 28, 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)

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HOUSTON, TX - AUGUST 29: People make their way out of a flooded neighborhood after it was inundated with rain water following Hurricane Harvey on August 29, 2017 in Houston, Texas. Harvey, which made landfall north of Corpus Christi August 25, has dumped nearly 50 inches of rain in and around areas Houston. (Photo by Scott Olson/Getty Images)

HOUSTON, TX - AUGUST 29:  People make their way out of a flooded neighborhood after it was inundated with rain water following Hurricane Harvey on August 29, 2017 in Houston, Texas. Harvey, which made landfall north of Corpus Christi August 25, has dumped nearly 50 inches of rain in and around areas Houston.  (Photo by Scott Olson/Getty Images)