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Just fyi from experience, beware of splashing. My first attempt at waterfalls sucked. The water didnt go anywhere i intended it to go and splashed/dripped all over the place. I ended up doing it similar to grims with a trickle down some driftwood and have been happy with it ever since.
I plan on having the water come from a hollow piece of wood into the stream.
I'll have to keep in mind to find a wood that works well with being wet all the time.