Permeable pavement, clay soil, general water management

We still have a cistern, so directing water directly into the sewer system is not necessary. A gutter in front of the house has already been considered if we don’t build a step. I would decide exactly how once the shell construction is finished and I can see the site with the house. It’s quite different from the plan after all. A gutter at the patio door is definitely still planned, even though it is less problematic from the site’s perspective.

For the driveway, we tried to keep it relatively small. After all, it is also an area that has to be paved expensively and with effort. And pulling the carport nicely forward also has the advantage that I can place the garden shed and the trailer (with my catamaran) behind it.

One question I still have is about joint width and porous stones. Since I’m not a fan of wide joints, I would tend to stick to 5mm, which is enough for most stones to be considered "permeable." How much difference does a wider joint make? And how much do permeable pores in the paving stones make in comparison?

One question I still have is about joint width and porous stones. Since I'm not a fan of wide joints, I would tend to stick to 5mm, which is enough for most stones to be considered "permeable." How much difference does a wider joint make? And how much difference do permeable porous stones make in comparison?

Hard to say. My landscape gardener says that the pores are clogged after a few years of driving over them anyway, and the whole thing is just a sham. My neighbor's landscape gardener swears on it that the permeable stones with pores work well permanently. So what now? However, they agree that the substructure is what really matters.

We still have a cistern, so it doesn’t have to be directed straight into the sewer.

Only cistern or cistern-rigole combination?

Combined cistern garden irrigation+retention with emergency overflow into the stormwater sewer. The full modern package ;)

So, one more question on the topic. How deep should the excavation be (I need it to roughly calculate whether I will need external soil) and what is the best way to fill the substructure? A large layer with medium grain size (2-32?) or a lower layer with coarse grain size (45?) and on top one with 32, or frost protection gravel at the bottom and only then the base layer with 32? Somehow every source says something different... and some also use 0-32mm?

How deep should one excavate there (I need this to roughly estimate whether I will need additional soil) and how is the substructure best filled? A large layer with medium grain size (2-32?) or a lower layer with coarse grain size (45?)

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