The importance of sewers for a city is self-evident, if the geographical location determines the lower limit of urban development, then the construction of sewers determines the upper limit of urban development, Hugo once said: sewers are the conscience of a city.

It is an important facility for evacuating floods, an important channel for sewage discharge, and a lifeline for urban life......

This shows the importance of sewers.

And the most representative of them is the Paris sewers.

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