A large storage tank in Bolton that outfalls to the Croal, unlike it's sibling across town this one has a large central column.
A 300m long storage tunnel that slows flow from an incoming sewer before it enters Bolton's outfall sewer, the bottom end was a filthy mess.
A connecting tunnel/overflow for Manchester's massive outfall sewers.
Found below the streets of South London this Victorian beauty is officially known as the Clapham Storm Relief
This storm relief varies from 6 to 16ft and collects overflows from multiple sewers including the Effa, Balham and Southern High Level sewers.
This system forms part of Bolton's storage and overflow facilities with 2 CSO chambers and a 10000m3 tank.
This little culvert found near Bolton is around 280m long, it takes a small watercourse underneath a railway and flows into the Middle Brook