I guess that if you have the water pressure to reach the sinks on the top floor, you must have the water pressure to get a fountain to spray that high.
I realize this morning I probably formed these ideas from playing with the outdoor water hose as a kid. You know, you put your finger over it, narrow the aperture, water squirts further.
Thumb over the hose increases the speed of the water for a given flow rate (rocket engines have a similar effect in the convergent sections of their nozzles, which I taught about last week). I would assume that the fountain nozzles have an effective thumb-over-the-hose effect to get the maximum effect out of whatever pressure they have.
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