Beginner Gardening: Help me design a waterfall for this pond, 1 by 1AnjL

1AnjL wrote:
any suggestions on how to keep the water in the water fall from seeping backwards into the bed?

I put a liner underneath all the flagstone incorporated into the water fall, also put pebbles and sloped everything forward...but somewhere I am still loosing water (about 2 inches per day)
I am assuming that the water is coming off the rocks and seeping back into the flower beds....or other possibility is that it is evaporating off the rocks before it gets to the lower pond?

thinking of trying to put pond liner directly from the upper level lip that will go directly into water at lower pond.... just wondering if anyone else has a better idea...before I go moving all those stones again! LOL!

Here is a close-up