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The sewage system was (and is still) used to carry human waste and drainage water. “He demands that the brick built sewer tunnels are wide at the top, in the shape of an upside down egg. This is contrary to the narrow pipes favoured by most engineers, the accountants and many health reformers.” Joseph Bazalgette. (2013). Retrieved from http://www.history.co.uk/biographies/joseph-bazalgette. The system carries about 8,000,000 Londoners waste and drainage every day, therefore it needs to be strong and that’s why the sewer tunnels are in a weird shape. “The by now balding, grey whiskered engineer calculates the size and diameter of tunnel needed to take the waste of every citizen. And then he doubles it.” Joseph Bazalgette. (2013). Retrieved from http://www.history.co.uk/biographies/joseph-bazalgette. The reason Bazalgette doubled the diameter was probably for making the human waste and drainage easier to “glide through”. The invention of Bazalgette is truly