Manhole and sewer network

A manhole for subterranean installation, the manhole comprising:

• a first chamber arranged to transport storm water and comprising a first inlet and a first outlet, the storm water being received into the first chamber via the first inlet and being discharged from the first chamber via the first outlet;
• and
• a second chamber arranged to transport sewage water and comprising a second inlet and a second outlet, the sewage water being received into the second chamber via the second inlet and being discharged from the second chamber via the second outlet;
• wherein:
• the first chamber and the second chamber are separate chambers fluidly disconnected from one another, such that the storm water and the sewage water do not mix during transport through the first and second chambers, respectively;
• the first chamber comprises a first access port opposed to a first base and a first wall arranged therebetween;
• the second chamber comprises a second access port opposed to a second base and a second wall arranged therebetween;
• a first normal to the first base extends through the first base and the second base;
• the first normal extends through a first region defined by a first perimeter of the first base, the first perimeter being defined by an intersection of the first base and the first wall;
• and
• the first access port and the second access port each lie in a single plane, the single plane being substantially perpendicular to the first normal.