  Turbulent fountains are widespread natural phenomena with numerous industrial
applications. Extensive research has focused on the temporal evolution and
maximum height of these fountains, as well as their dependence on Reynolds and
Froude numbers. However, the minimum height of the surrounding ambient fluid,
which is removed by the fountain due to the entrainment effect, has received
little attention. In this study, we investigate the dependence of this minimum
height on the characteristics of the fountain and demonstrate how to control
it. Our findings present important implications for technological applications
of turbulent fountains, particularly in contaminant withdrawal. We discuss the
potential of our results to improve the efficiency of such applications.
