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.