ELi5 why does toilet water never rise above “set” level? You flush toilet? Water level inside of it doesn’t rise over the “set level” and etc.
In: Engineering
Your toilet [has a trap in the back](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b2/Diagram_of_a_jet-siphonic_WC_bowl.svg/1024px-Diagram_of_a_jet-siphonic_WC_bowl.svg.png) which is a little S shaped bend that is partially full of water
The trap ensures that there is an air tight seal on the end of the sewage pipe which is good, but its also laid out so that if the water level in the bowl rises, it just goes over the back end of the trap and the water level resets to the left of the back of the trap as shown in the image.
This is also why sometimes you flush and it seems the water all seems to get sucked out of the bowl, its because it has formed this air tight seal but also picked up enough speed that it is generating suction in the bowl and pulling all the water (and other bits) down with it
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