How To Make A Waterfall Effect

Here I posted my progressive of my current scene that I’m creating. I need help in creating a waterfall. I added the current “waterfall” with landscape splines and having a basic water material. I also need help with having realistic water(materials and textures). I plan on putting rocks, other foliage and other assets to the scene.



What are those green arrows/dots on the waterfall? What do they do?