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The problem you didn't touch on specifically is that it still makes sense to separate sewage from runoff, which is not cheap and becoming increasingly common in
by beembeem 3y ago
The problem you didn't touch on specifically is that it still makes sense to separate sewage from runoff, which is not cheap and becoming increasingly common in major US cities. Untreated sewage mixed with storm runoff makes for far worse water quality conditions than merely runoff.
- rurban 3y agoSure, a closed system is always preferred. But bigger cities just cannot afford to change all tubes now. Some did though. Paris or my city are just too big, or don't have enough time/budget.