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Rainfall in Greater Houston could fill Great Salt Lake twice

What else does 9 trillion gallons of water look like, comparatively?

A man waves down a rescue crew as he tries to leave the area after it was inundated with flooding from Hurricane Harvey (Joe Raedle/Getty Images). (Getty Images)

HOUSTON – What does 9 trillion gallons of water look like?

Let's examine some comparisons for a better understanding and some perspective.