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
It just has to make it to the sewer which is easy enough especially as they’re usually sloped on the way there. The sewers already have other water coming from any number of sources plus may be fed a trickle at the head of the pipe to keep things moving.
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