Conflict drainage and stormwater main pipeline

Hello everyone,

we want to lay a drainage system around our basement/cellar level – this has to be laid around the house (new build, i.e. everything is still in planning) and then led towards the cistern. Of course, at every change of direction (house corner), inspection chambers should also be installed.

Now, the roof drainage must be done the same way – the pipes (at least those of one half of the roof) also go around the house, i.e. they run several meters parallel to the drainage pipes and should also have inspection chambers.

However, this leads to an unpleasant situation at two corners, where two inspection chambers are planned next to each other, one for drainage and one for roof rainwater drainage.

I can’t imagine that this is really done this way – are there any alternative solutions, combined chambers or any tricks to avoid this?

Thanks for your suggestions!

One shaft is sufficient for the drainage, but it must be large enough to fit a submersible pump. Fleece around the drainage pipes and the shaft to prevent clogging. For the downpipes, we do not have a shaft; they go directly into the cistern.

I only have one inspection chamber for the pump on the drainage as well. The downpipes are connected to the sewer system and have an inspection chamber on the property where all the pipes converge underground.

If you need a drainage pump… good luck finding a reasonable solution…

Thank you for the feedback. However, I am not sure if we might be talking about two different things - in our case, we do not need a pump, as we can simply lay the drainage pipes with a slope towards the inlet.

However, it is claimed everywhere (on the internet) that drainage pipes should have inspection shafts (DN300 or larger) at every change of direction (usually at the corner of the house) in order to maintain or flush them. According to DIN 4095, this is supposedly mandatory.

Was this not implemented like this in your case?

Thank you for the feedback. However, I am not sure if we might be talking about two different things - in our case, we do not need a pump because we can simply lay the drainage pipes with a slope towards the inlet. However, it is claimed everywhere (on the internet) that drainage pipes should have inspection shafts (DN300 or larger) at every change of direction (usually at the corner of the house), in order to maintain or flush them. According to DIN 4095, this would supposedly be mandatory. Was this not implemented like this in your case?

No, we only had one shaft with the pump. However, I would have felt more comfortable with two shafts as well. We only had two corners. The pump has to lift about 1.5m for drainage.

However, this leads to an awkward situation at two corners where two inspection shafts are planned next to each other, one for drainage, one for roof rainwater drainage.
I can't imagine that this is really done that way - are there any alternative solutions, combined shafts or any tricks on how to avoid this?

My dry ideas about wet matters also leave something to be desired: namely pictures ;-)