How much water has to flow into the Mikveh? A mathematical solution
Yavin, Y. 2005.  BH 15:175-177. CELD ID 21538

Abstract
Mishnah 3 of chapter 3 of Tractate Mikvaot states that a hypothetical mikveh is disqualified "until it is calculated" that there is less than three llog of its original drawn water remaining. The mishnah does not explain how the calculation should be made. Using high school mathematics, I am suggesting a way to make this calculation.