Last updated at 11:28

Tropical Storm Harvey in numbers

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Tropical Storm Harvey has moved on to other parts of the United States after battering the city of Houston in Texas for the past four days.

The storm, the most powerful to hit the area in 50 years, has dumped record rainfall in the region.

Large parts of Houston are underwater, and more than 20 people are reported dead.

Watch Ricky's report looking at the big numbers behind Storm Harvey.