In pictures: Houston overwhelmed by 'unprecedented' floodsPublished28 August 2017Shareclose panelShare pageCopy linkAbout sharingImage source, AFP/GettyImage caption, Water is so deep in places in Houston that it almost reaches signage over roadsImage source, AFPImage caption, Much of the city's road system has been overwhelmed by floodwatersImage source, AFPImage caption, Many shelters have been set up, including at a convention centreImage source, AFPImage caption, Officials say 30,000 people are expected to be housed in these emergency sheltersImage source, AFPImage caption, Scores of vehicles are submerged across the city, with some owners having to be freed by emergency workersImage source, ReutersImage caption, The coastguard has been among the rescuers working to help stranded residentsImage source, ReutersImage caption, Helicopters had to winch people up to evacuate them to safetyImage source, ReutersImage caption, Many evacuees prioritised rescuing their pets above their belongingsImage source, ReutersImage caption, Emergency 911 operators in Houston received 56,000 calls over a 15-hour time period - seven times more than during a usual working day.Image source, ReutersImage caption, Aerial photographs from the city's high-rises show how overwhelmed Houston's infrastructure has becomeImage source, ReutersImage caption, A woman and her dog awaited assistance on a floating airbedImage source, AFPImage caption, At a news conference, the Federal Emergency Management Agency called on ordinary citizens to "get involved" in the unprecedented rescue effortsMore on this story'Catastrophic' floods rising in HoustonPublished29 August 2017Storm victims urged to call not tweetPublished28 August 2017Harvey v Katrina: Lessons learned?Published28 August 2017