ᐅ Conflict between Drainage and Stormwater Main Pipe

Hello everyone,

We plan to install a drainage system around our basement/souterrain level – this must be laid around the house (new build, so everything is still in the planning phase) and then directed towards the cistern. Of course, inspection chambers need to be installed at every change of direction (house corners).

Now, the roof drainage system needs to be done in a similar way – the pipes (at least for one side of the roof) also run around the house, meaning they run parallel for several meters alongside the drainage pipes and also require inspection chambers.

This creates an awkward situation at two corners, where two inspection chambers are planned side by side, one for the drainage and one for the roof rainwater system.

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

Thanks for your suggestions!

One drainage pit is sufficient, but it should be large enough to fit a submersible pump. Use a geotextile fabric around the drainage pipes and the pit to prevent clogging.
For the downspouts, there is no pit; they go directly into the cistern.

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

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

Thank you for the feedback. However, I’m not sure if we might be talking about two different things – in our case, we don’t need a pump because we can simply lay the drainage pipes with a slope towards the inlet.

However, it is commonly stated (online) that drainage pipes should have inspection chambers (DN300 or larger) at every change of direction (usually at house corners) to allow for maintenance and flushing. According to DIN 4095, this is supposedly mandatory.

Was this not implemented this way in your case?

Harakiri schrieb:

Thanks for the feedback. But I’m not sure if we might be talking about two different things—in our case, we don’t need a pump because we can simply lay the drainage pipes with a slope towards the inlet.

However, it is often stated (online) that drainage pipes should have inspection shafts (DN300 or larger) at every change of direction (usually at a building corner) for maintenance and flushing purposes. According to DIN 4095, this is supposedly mandatory.

Was this not implemented that way in your case?

No, we only had one shaft with the pump. But I would have felt more comfortable with two shafts. We only had two corners. The pump needs to lift about 1.5m (5 feet) for drainage.

Harakiri schrieb:

However, this results in an awkward situation at two corners where two access shafts are planned side by side, one for drainage and one for roof rainwater drainage.
I can’t imagine this is really done that way – are there any alternative solutions, combined shafts, or any tricks to avoid this?

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

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