More than 11 inches of rain fell in some areas of Houston on April 27 and 28.
Heather Saucier, a spokeswoman for the Harris County flood control district, said more than half of the flooded houses weren't in a mapped flood plain. She said that was a reminder that every property owner in the county is at risk for flooding, the Houston Chronicle reported.
At least 1,350 of the residences were in Houston.
Gov. Rick Perry is waiting for inspectors to continue assessing damage before making a decision on what type of assistance to seek for the area.
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