Q&A: Flowing at the Edge of the Mikveh
Originally published:
This is an English translation (via GPT-5.4). Read the original Hebrew version.
Flowing at the Edge of the Mikveh
Question
The Mordechai’s view is that a mikveh that developed a crack is invalid even if 40 se’ah remain below the crack, since all the mikveh water is set in motion to flow out and is therefore considered flowing water.
Could you explain to me, from a physical standpoint, to what extent water exiting from the upper part of a mikveh causes movement in the water in its lower part?
Answer
As long as the water above is flowing out, it obviously moves the lower water too. After it has flowed out, that no longer happens.