Tropical storm Harvey: catastrophic floods in Houston as city braces for days of rain
by Tom Dart in Houston from on (#30F8T)
Fourth-largest city in the US could see 50in of rain as rescue workers struggle to keep up with calls for help and flood defences are tested to the limit
Tropical Storm Harvey has continued to batter Texas, hurling record rainfall at the nation's fourth-largest city, forcing thousands of people to flee their homes and testing flood control systems to their limits.
Related: Ex-hurricane Harvey: Houston flooded as catastrophe unfolds in Texas - latest updates
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