The chamber serves an 8ft sewer, overflow weir and the brick overflow pipe I had been looking for. Unfortunately it was thigh deep in river level water which slowly rose and fell with it's load of rubbish from previous overflow events.
The manhole shaft leads down inbetween the A & B Outfall sewers. At the bottom is a 6ft pipe that connects both trunks to allow the flow from one to enter the other when flow levels are high.
A connecting sewer gives a close up view of one of Manchester's massive trunk sewers.
I thought this might be a bit more interesting then the small pipe and CSO it turned out to be, until you go you don't know.
Located near Rochdale is an outfall onto the River Roch, capped in stone and giving way to brick it looks allot like the Works.
Located near Bury this CSO provides an overflow for one of the town's main sewers before it travels under the Irwell on its way to the treatment works.
This little culvert, found near Droylsden, is around 350m long and built of stone and brick. I went in from the outfall, after a stoopy 4f beginning it opened up slightly and allowed a more comfortable walk.