Please help with waterfall design


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I am looking for advice on my waterfall. I can’t seem to find much info on how deep my pools and streams should be. My waterfall is a split design approx 20 ft long and about 2 or 3 ft up from my pond. I figured the top of my spill stones would be 3in and then the liner would come up another 3in. I’m not sure if 3in above the spill stone would be enough or how high the water would come. I’ve seen many videos online and I’m trying out some ideas before I place my liner. I just want to make sure I get this part looking and functioning really good. Any advice would be appreciated thanks.
 

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I will try to get another picture of how I have top of my waterfall after placing these stones. Two frame rocks and a spill stone in the middle. Not the best pictures sorry.
482714C4-0191-4FB1-8AED-E4713FE1D7D7.jpeg
 
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The first step imo to a waterfall is how mush splash can your pond or design can you control. If your pond is only 3 feet wide then I wouldn't think about a 4 foot waterfall 2 foot would be the max drop. The wind can realy take hold of a waterfal and blow the water in directions or distance that boggle the mind.
If you did more like a stream or had a rock just infront of where the water will land this can catch the splash before the water gains momentum and starts flying all over the place. A simple little splash outside of Containment can cost 100s of gallons a day week or month.

Having tall character stones to the side of the waterfall are a natural looking way of controlling splash and might even limit your wind. That and having the character stones pulled inward toward each other on the outside edges. Making a flatened out horse shoe.
Then have the pond continue to widen this will make any splash have to fly a good distance before if gets out of the pond.

There's another consideration to think about with waterfalls and that is sound a shallow landing in a pooling area will give more of a tinny sound to the waterfall. A narrow stream of water falling into a deep pool will give off more base. And often volume. If as little sound as possible is what you seek then have the water drop onto a rock that's on an angle that's almost vertical and let's the waterfall slide into the pond.
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Looking down _220826_101339.jpg
 
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