Infiltration of rainwater, which method?

I find that a bit little. In our development plan, 3 cubic meters are already required. The demand is just under 4. What do you want to dispose of in the 1.2 cubic meters?

I can only tell you what Graf calculated. I think it also depends a lot on the region. After all, the amount of rain is taken into account.

I don’t understand your question. Iglus can only be installed horizontally, how else should that work? With seepage boxes, you can, if in doubt, go completely into the depth.

Well, quite simply, the tunnel is not built into the depth, it is only 51cm high, but is laid lengthwise with 4.6m, so on the surface. The iglu is deeper than wide, so it is built into the depth.

Well, quite simple, the tunnel is not built in depth, it is only 51cm high, but laid lengthwise with 4.6m, so on the surface. The igloo is more deep than wide, so it is built in depth.

I think I need to elaborate a bit. Igloos and tunnels are both built on the surface. Example igloo: I have 8 igloos, how are they built? On the surface, because building in depth is not possible. Example tunnel: I need 4 tunnels for the same. I can build these one after the other, or I can build 2 by 2. Example boxes: for the same I need 16 boxes. The boxes I can lay all on one level. Or, and here comes what I mean by depth, I dig deeper and make a layer of 8 boxes and place the next 8 boxes on top (so instead of 66 cm deep, I go 1.3 m deep). I can basically do this arbitrarily; this possibility does not exist with the others. I hope it is clearer now what I mean.

Yes, now understood

Why did you choose igloos?

I did not choose igloos [emoji6] We will use the blocks from Graf. We cannot go so deep into the ground (because of the highest groundwater level), so only those remain.

: in case I missed it, sorry. How many liters do you have to let infiltrate, with how much roof area? For us, it seems that with the 265 sqm according to the graph, over 10k liters accumulate (420l boxes 24 times). Is that correct? That seems really terribly much to me.

that strongly depends on the soil. What Kf value did you specify? For a roof area of 140 sqm, I come to 14 boxes. It’s because of the not so great Kf value. Your 24 are almost harmless in comparison