Question: How big is the london sewage system?

Charlene Chung answered on 12 Mar 2019:

Pretty big, extensive and epic!

Back when the london sewer were first created, the civil engineer that was responsible for creating them Jospeh Bazalgette spent 9 years digging up London to create 6 ‘interceptor’ sewers, which were around 100 miles long altogether. Another 450 miles of sewer fed into them.

The interceptor sewer was made out of 318 million bricks and 670,000m3 of concrete.

It helped eradicate cholera in the entire city of London, reduce the rates of typhoid and provide a sewage system for millions of people.

More recently, as you may have seen a tv programme about the super sewers in London.
This is a 25km tunnel constructed under London’s river Thames that will prevent the tens of millions of tonnes of pollution that currently pollute the River Thames every year.