The CSO was accessed via the 1100mm RCP outfall to the river Croal, in a secluded area. The first chamber is just a few metres in. The original overflow chamber would have been straight ahead from here, however modifications were made a few years back and this has now been walled-up and the tunnel now makes a 90° turn.
Downstream, the RCP leads to a new, larger overflow chamber which contains a processor.
The sewerfresh as it makes its way through
It is over this wall that any effluent makes its way to the Croal in the event of the detention tank being unable to take any more sewage.
At the other side of the overflow chamber is another length of RCP which takes the effluent during overflow. A few metres in is another chamber on the other side of a penstock.
At this point there is a 90° turn to a short length of RCP which leads to a vertical drop. This is where overflowing sewage enters a 1600m² detention tank - which unfortunately I was unable to gain access to on this visit.
And here is an image of this vertical drop as seen from above:
Downstream, the RCP leads to a new, larger overflow chamber which contains a processor.
The sewerfresh as it makes its way through
It is over this wall that any effluent makes its way to the Croal in the event of the detention tank being unable to take any more sewage.
At the other side of the overflow chamber is another length of RCP which takes the effluent during overflow. A few metres in is another chamber on the other side of a penstock.
At this point there is a 90° turn to a short length of RCP which leads to a vertical drop. This is where overflowing sewage enters a 1600m² detention tank - which unfortunately I was unable to gain access to on this visit.
And here is an image of this vertical drop as seen from above:
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