I saw some discussion about adding pumps and water dynamics.
It seems the water dynamics are already a bit there with the ripples on the surface.
All that is missing is the pumping.
And plumbing is complicated. BUT
Could we have a "virtual" pump where we just place an intake and output with a direction at least for the output and a flow control?

This would ignore the complexity of the plumbing, equipment placement, etc. But provide the fundamental effect of a pump.