We have built many Ponds, Waterfalls and Creeks but they have all had consistent waterflow over the fall. We currently have a customer that has asked if it possible to vary the amount of water coming over the waterfall. I know that we could do a couple of pumps and each one have its own switch - but I was curious if anyone has ever come across some sort of variable speed pump that could be controlled from a switch inside? Or a valve that could accomplish the same? Any input and or ideas would be greatly appreciated.