1mW Sewerage Design to MSIG 003
Sewer Manhole
In gravity sewer network, precast concrete manhole is provided to enable maintenance.
Every sewer network should begin with a manhole. Whenever there is a change in terms of pipe alignment, gradient or diameter, a manhole needs to be provided to act as a transition to those changes.
Other than that, manhole is provided at the junction of two or more sewer pipes to properly direct the flow.
Under normal condition where sewer pipe diameter is below 900mm, the maximum spacing between manholes should not exceed 100m.
When the invert level difference between incoming and outgoing pipes exceeds 600mm, backdrop structure should be provided. For drop less than 600mm, free drop is allowed.
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