Edit: OK, I am not sure where I got 2.5 gallons from because it turns out standard toilets in the US are 1.6 gallons, as the comment below states. It still seems crazy to me that 1.6 gallons can push waste all the way from the toilet to the sewer. I feel like it would stop at some point and need more water to get to the street.
On a side note, I find plumbing and water treatment fascinating.
In: Engineering
When the sewer from your home its piped having pitch downwards and used a turn at the end of the line rolling into the city sewer to increase speed much like a small waterside. Then the city sewer is pitched as well and has the quantity of everyone else’s house feeding into it as well. In most cases it leads to a pump station then pumped from there to a treatment center.
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