Pim’s been working a lot on drains under the driveway.
I’m trying to convince him to write a post about it.
Later: Pim never got around to it, but I found these pictures:
We had the laundry and dishwasher backing up into the house, then investigating and breaking up the concrete floor on the court we found out that there was no drain, the water was simply being spewed onto the sand below… which at some point got saturated. We had to find the main drain further and attach new drains to it. What an incredible mess!!