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by rewmie 1055 days ago
> Some countris have mandated >30 meters of green area on each border of rivers.

I think this has more to do with flood plain management. Some countries prohibit construction within X meters of the average water level because that's expectedly where water will rise. In some shallow areas municipalities even build parks with no permanent structure because of the high probability those areas will be flooded, and that ensures no life is put at risk and economic damage is limited to whatever infrastructure was placed there (i.e., park benches, public restroom, small public cafe, camping ground, etc.)