Manhole can be defined as an access point inside the sewer line for material and workers. It is the most important component of the sewer line because it completely eliminates the need for the digging process and it is also known as an Inspection chamber or Unit.
The main purpose of the construction of manhole is trenchless rehabilitation for the sewer system, an inspection of a drainage system, cleaning the clogged line, and maintenance purpose, also it is an initial step for entering the inside sewer line and finding out a problem on it and it also helps to replace the damaged pipe without need of digging work.
