Rainwater infiltration through drainage pipe

Only the infiltration trench (21 x 80x80x35) should cost us 3500-4000 EUR including all work. However, that was from an expensive company that we then did not hire.

We now have two concrete soakaways, as far as I know this is not allowed everywhere.

If you write that the infiltration tunnel has an infiltration capacity of 50m DN100 drainage pipe, are there any rough rules of thumb? I usually do it more or less by guesswork. As I said, I would have laid 3x drainage pipes with a total length of about 100m. The pipes are differentiated by volume: 600, 1800, 3000l.
What corresponds to about 100m DN100 drainage pipe?
Of course, 100m lets the water infiltrate better than a 10m soakaway.

I have only seen the soakaways with an additional shaft (for ventilation?). Is that absolutely necessary? I wouldn't have done that with the drainage pipe either. I don’t assume that the rain is so heavy that the DN100 is completely full and no air can escape.

I just roughly estimated it based on the area (for the tunnel it was there, for the drain pipe it is about pi/2). The determining factors in the end are the soil permeability and the groundwater level. Everything is included in the DWA Merkblatt 138.

Hello everyone,

Wrapping coconut fiber or fleece directly around the drain pipe is actually not optimal and gets clogged. Therefore, DIN 4095 also excludes this procedure. The drain pipes are to be laid in a gravel bed, which in turn is to be embedded in a [Geotextilvlies] all around. But never wrap the pipe itself!

A well-known hardware store chain has a nice video showing how to do the work correctly.

Regards