The rainwater tanks are here!
The big tank (5m3) will store roof water from the gutters, and a seepage tank (the smaller blocks with holes) will absorb the overflows, as it is forbidden here to discharge storm-water into sewers for all new construction.
It is a very good law, rainwater returns to the water-bed where it belongs, rather than finishing in a river and sea after an unnecessary passage through a sewage treatment plant ...
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