I am duly impressed with your whole project - especially its visual attraction from a distance. Your choice of flora appears "dead-on."
When I construct a stream bed for a client I create a cross-section of a capital "M" over entirely which the EDM liner lies. This method affords me hide the black edge into "side" soil, on which I can cover with large rocks as visual objects and/or into which I plant flora. Engineering wise, these two hidden edges helps to keep ground water from washing away the direct support for the stream/EDM liner/rock, etc., and their banks. If necessary I also will install multi-flow piping (from Varicore), especially on the uphill side of the stream path, to intercept all ground water from trying to pass directly under that stream bed/EDM. All of these precautionary methods are $ expensive, and often clients balk at such "over-kills" initially. However, when they choose someone else, that is fine; at the very lease, I do not lose my reputation or sleep on "call-backs."
Waterfalls can contain many characteristics in their construction and design, as you have well demonstrated, but they all generate the same two results: reflecting light and sound. I try to vary both size and sound given the relative restrictions/enhancements of available slope. [Here, in southeastern Louisiana, "slope" is a foreign word; we are thankful for 1:12 if available.] A tiny, slow drip into a small pool of water can generate a loud sound. [I prefer a small stream just to avoid driving myself nuts similar to my kitchen faucet dripping.] Although I am not sure, I believe that the depth of the receiving "pond/puddle" can change the pitch of the sound generated by the dripping/flowing waterfall into it.
I happily never have "grown up;" I still love damning, changing stream patterns, and creating tiny spaces for small animals and hobbits. Obviously, you are truly enjoy yourself and have set a "play" standard for the rest of to gleefully to follow. Thank you.
