!! Very deep concrete manhole

A manhole or an inspection chamber is a unit constructed underground to provide access to the utilities like a sewer system, drainage system, etc. Hence, with the help of a manhole, underground utilities are inspected, modified, cleaned and maintained.

Types of Manhole
The three main types of manhole depending on the depth are:

Shallow Manhole
Normal Manhole
Deep Manhole
Purpose of Manhole
The main purpose of a manhole is:

To perform inspection, cleaning, and removal of any obstruction present in the sewage line.
The joining of sewers, the change of direction or the alignment of sewers can be performed with the help of manhole.
These have a perforated cover which helps the foul gases to escape. Hence it is a good means of ventilation for the underground sewage system.
Manholes help to lay the sewer line in the conventional lengths.

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