[filipheremans]

In Belgium it is mandatory for new houses to collect rainwater from the roof and use it for your toilet or washing machine, or to use a special well to let it soak into the ground slowly. This is quite cheap actually. The main purpose is to avoid this rainwater to come into the wastewater system.

[Two4]

Interesting - in our country we have street-level stormwater channels which are separate from sewers, and drain straight to streams, rivers and ultimately the ocean. Is that sort of infrastructure not present in Belgium? I can imagine retrofitting that kind of thing into older urban streets may be tricky, but seems like a wise investment.