In pictures: Houston overwhelmed by 'unprecedented' floods

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The city is pictured beneath clouds as a whole highway is overwhelmed by flood waters almost reaching the over-road signageImage source, AFP/Getty
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Water is so deep in places in Houston that it almost reaches signage over roads

Image source, AFP
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Much of the city's road system has been overwhelmed by floodwaters

Image source, AFP
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Many shelters have been set up, including at a convention centre

Image source, AFP
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Officials say 30,000 people are expected to be housed in these emergency shelters

Image source, AFP
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Scores of vehicles are submerged across the city, with some owners having to be freed by emergency workers

Image source, Reuters
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The coastguard has been among the rescuers working to help stranded residents

Image source, Reuters
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Helicopters had to winch people up to evacuate them to safety

Image source, Reuters
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Many evacuees prioritised rescuing their pets above their belongings

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Emergency 911 operators in Houston received 56,000 calls over a 15-hour time period - seven times more than during a usual working day.

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Aerial photographs from the city's high-rises show how overwhelmed Houston's infrastructure has become

Image source, Reuters
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A woman and her dog awaited assistance on a floating airbed

Image source, AFP
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At a news conference, the Federal Emergency Management Agency called on ordinary citizens to "get involved" in the unprecedented rescue efforts