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HOUSTON, TX - AUGUST 30:  Flooded homes are shown near Lake Houston following Hurricane Harvey August 29, 2017 in Houston, Texas. The city of Houston is still experiencing severe flooding in some areas due to the accumulation of historic levels of rainfall, though the storm has moved to the north and east.  (Photo by Win McNamee/Getty Images)
HOUSTON, TX - AUGUST 30:  Flooded homes are shown near Lake Houston following Hurricane Harvey August 29, 2017 in Houston, Texas. The city of Houston is still experiencing severe flooding in some areas due to the accumulation of historic levels of rainfall, though the storm has moved to the north and east.  (Photo by Win McNamee/Getty Images)

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    Crews go door to door in search for flood survivors

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Crews go door to door in search for flood survivors

In the wake of Hurricane Harvey, emergency crews are going door to door searching for flood survivors. CNN's Brian Todd reports from Houston.

Crews go door to door in search for flood survivors

In the wake of Hurricane Harvey, emergency crews are going door to door searching for flood survivors. CNN's Brian Todd reports from Houston.