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Report - Scavenger, Bolton - October 2015

Ventena

28DL Full Member
28DL Full Member
#1
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.

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Downstream, the RCP leads to a new, larger overflow chamber which contains a processor.

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The sewerfresh as it makes its way through

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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.

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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.

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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.

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And here is an image of this vertical drop as seen from above:

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