Access to this CSO was gained via the brick outfall, which is approximately 5½' in diameter.
After about 100 metres or so we arrive at a modern concrete installation where the tunnel forks into two branches. The right-hand tunnel is the original outfall which is now a bypass leading to part of an overflow chamber on the other side of this new screening installation.
A few metres into the left-hand tunnel we come to a concrete chamber with a grilled ceiling.
Some ladders take us through the grilled ceiling to the level above, an area containing screening control apparatus.
This area houses controls for two penstocks below, the point at which overflow enters the screening system.
Beyond this is an overflow chamber where any excess flow can spill over the wall on the right-hand side and exit via the bypass tunnel.
The original brick outfall then continues for about another 100 metres or so, leading to the main overflow chamber.
This is a large, impressive arched brick structure containing a huge penstock with a stone counter-balance weight.
Iron steps give access to a level above and to a door on the other side of the Work 5 interceptor sewer.
Two sewers connect here, the one on the right-hand side I believe to be the Work 6 interceptor.
The outfall culvert leading to the river Irk.
After about 100 metres or so we arrive at a modern concrete installation where the tunnel forks into two branches. The right-hand tunnel is the original outfall which is now a bypass leading to part of an overflow chamber on the other side of this new screening installation.
A few metres into the left-hand tunnel we come to a concrete chamber with a grilled ceiling.
Some ladders take us through the grilled ceiling to the level above, an area containing screening control apparatus.
This area houses controls for two penstocks below, the point at which overflow enters the screening system.
Beyond this is an overflow chamber where any excess flow can spill over the wall on the right-hand side and exit via the bypass tunnel.
The original brick outfall then continues for about another 100 metres or so, leading to the main overflow chamber.
This is a large, impressive arched brick structure containing a huge penstock with a stone counter-balance weight.
Iron steps give access to a level above and to a door on the other side of the Work 5 interceptor sewer.
Two sewers connect here, the one on the right-hand side I believe to be the Work 6 interceptor.
The outfall culvert leading to the river Irk.
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Spent about half my life in here during 2014 with 
