Drainage covered only on one side by fleece

Hello dear forum members,

today I took a closer look at the drainage work on our construction site and became somewhat skeptical.

Until now, I thought that the drainage pipe must be surrounded all around by gravel, which in turn must be enclosed by a fleece. On our construction site, the drainage pipe was indeed laid on gravel, but the fleece was only laid on top. Furthermore, the amount of gravel used seems very small to me.

We have a clayey soil, which is why I actually thought that significantly more gravel had to be filled in. Moreover, clay soil is known to be difficult to compact or not compactable at all, so you actually shouldn’t use it for backfilling, right?

So the fleece is just unrolled directly from the roll and laid only on top of the gravel and was nailed to the dimpled membrane (which has a fleece on it from the factory). As I said, I thought the fleece must completely enclose the gravel and the pipe like a kind of sack.

Thank you and regards

Put differently, is your basement built with masonry so that you even need drainage?

So first of all, that was not my question at all. Regardless of the circumstances, I want to know how to do it correctly. It is paid for and the work has started as you can see. So your counter-question doesn't help me. And no, we have a white tank but it is on a slope and the ground consists almost entirely of silt, which is why the water running down must be drained cleanly. This also follows from a recommendation of the soil expert.

It's a mess, according to DIN the drainage pipe including the gravel packing must be placed in a geotextile, otherwise soil particles will clog the pipe. If clay soil is placed back onto the drainage, you could have saved yourself the whole thing since it hardly allows any infiltration.

Thank you very much for your statement. The general contractor says he has done everything according to DIN. Then I will now confront him with the fact that it is botched.

What would be a sensible approach here? Have him excavate everything again? And the backfilling with silt is also not according to DIN 4095?

Thanks and regards

Sorry, editing was no longer possible, hence the addendum: Doesn't the drainage pipe also have to be 15 cm away from the [Noppenbahn] according to DIN? In the pictures, you can see very clearly that the pipe is lying directly against the wall.