In the 1850’s, London was the largest metropolitan then and required a good sewerage system which it lacked then. The then-present system was not adequate and required changes so as to combat the rising stench in the air and rise of epidemics. Then the brilliant engineer Joseph Bazalgette designed the modern sewer system of London which is considered to be one of the Seven Wonders of the Industrial World.
It was important at that time for an improvement in the sewer system of the city. As the city was growing and with development taking place at such a rapid pace, the River Thames had practically become an open sewer which led to the spread to epidemics like Cholera and Typhoid. The decision about a new sewer system was taken in 1858 when The Great Stink happened and there was a stink everywhere in the city due to the sewage flowing in the incapacitated sewers.
In the process of construction, six main interceptor sewers were built which totalled to almost 100 miles of length to cover the complete city. Out of the six, three were built to the north of the river. The lowermost levelled one was incorporated in to the Thames embankment.