Are all water treatment plants somehow *lower* than all the drains/houses/buildings/sewer lines that go to it? (I.e., to make sure all water drains to the treatment plants.) Surely this can’t be the case…?
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Drains go to the wastewater treatment plant (not the water treatment plant). Pumps are used. There are lift stations strategically placed throughout the city that lift (pump) the sewage water to a point where it can flow by gravity to the treatment plant where it is once again pumped to the various treatment processes.
Source: I’m a City Planner and married to a Civil Engineer.
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