Question

why are manhole provide a long severge system​

Answer 1

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Manhole covers also prevent objects and debris from getting into the drainage system where it could cause a blockage. They also prevent surface water from entering the drainage system at that point, so the drainage pipes do not become overfull during heavy rain.

Answer 2

HERE IS YOUR ANSWER

manhole provide a long severge systembecause

Circular shape is the strongest shape because the radius is same through out the design. Due to its Circular shape it can't fall inside the sewer or drain. Circular manhole covers are easily move or carry out from one place to another.

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