Bazalgette's sewers - the great stink
1858 - Great Stink in London caused by a heatwave which lowered the level of the Thames and caused exposed sewage to stink
1859 - MPs passed an act to provide the money to build a new sewer system in London
Bazalgette was appointed to design it and £3 million was provided to build it
Built in 1875 at a cost of £6.5 million
Thus the Great Stink forced parliament to provide money for a sewerage system