I would add, having helped with some houses relatives were building, that usually a fabric filter is put in as well, usually multiple layers, so that dirt has n

I would add, having helped with some houses relatives were building, that usually a fabric filter is put in as well, usually multiple layers, so that dirt has no chance of sneaking into the gravel. The cellars also have accessible pipes that can let water leave the cellar easily (installed at the lowest point of the cellar, so the floor is slightly tilted, as well as a replacable one-way valve to keep water from coming in the same way (IIRC it's weight activated, it only drains if more than about a liter of water is inside the pipe wanting to go out.