I have been looking for low, flat weathered rocks of the correct color while at our other home in Lanesboro. Not much luck. I then realized I have enough rocks although they are 6" thick. I was imagining a 6" waterfall as it is now. Hell, why not a 12" waterfall - more of a statement instead of a trickle.
Here is a sketch of my planned upper falls. Of course it will only vaguely resemble this. It is tough herding wild rocks because they tend to have a mind of their own.