Sewer build over with 90 degree bend in the Inspection Chambers

[ogaryo]

Hi, we are having a bit of a mare with a build over. Long story short is we are being told that we cannot effect a build over of a surface and a foul chamber than houses pipes that run 90 degrees to one another. The surface drain has 3 pipes in the shape of a tee and the foul has 4 pipes in the shape of a cross.

We are being asked to remove the chambers completely rather than build over and reinstate the chambers away from the building.

This involves installing 6 new chambers and associated pipework to bypass the existing chambers.

We need advice please relating to anyone who has recently been allowed by the utility company to build over a chamber with this configuration e.g. were you allowed to use rod eyes to access the old chambers from pipe runs not having new chambers installed or maybe you were permitted to access them from a neighbouring properties chamber in that pipe run

Hope you can help, we're on our 3rd set of diagrams after gaining approval to proceed based on flawed architect diagrams, spotted when Anglian Water attended site. These previous diagrams allowed the build overs.

Nb: the first set of diagrams showed no 90 degree bends so I understand why AW would retrospectively reject those but the second set does show the cross configuration and they were initially approved but have subsequently been rejected as the surface drain didn't show the T configuration. As you can imagine I am not best pleased with the company who have produced the diagrams but that is a side issue, I am really interested in getting back to a position where a build over is permitted rather than incurring the additional expense of 6 new chambers and a bypass.

Many thanks Gary

 

[bernardgreen]

Build overs are never a good idea. Even if all the pipes can be rodded in the direction of flow it does not garantee that the chamber is clear of debris. This could dry out, form a solid lump(s) and then fall into a block a pipe.

If the flow from the chamber is along the vertical of a T then it may be necessary ( at least advisable ) to add a means of rodding as shown in green.