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Measuring is always a Rabbinic prohibition. It is only prohibited to directly measure something, but there is no problem to do an action that indirectly measures something out. See Shulchan Aruch 3...
Answer
#1: Initial revision
by
simyou
·
2021-06-25T15:19:21Z (over 3 years ago)
Measuring is always a Rabbinic prohibition. It is only prohibited to directly measure something, but there is no problem to do an action that indirectly measures something out. See [Shulchan Aruch 323:1-2](https://www.sefaria.org.il/Shulchan_Arukh%2C_Orach_Chayim.323.1?lang=bi&with=all&lang2=en), and Shemirat Shabbat Kehilchatah 29:32. I also don't believe there is a Psik Reisha here, since if two taps are open there would not be any way to measure what each one took. Even with one tap open the metering is useless to know how much you just took, so I do not think it would be considered measuring at all.