The water fall could be done to some degree. Soon you will see a free "Snow Fall" prop I have created as a christmas present to the community. You could create a waterfall with a simial technique. The more real you want to look the hader it would be. As for interatcting with level water. The wave option in poser is great for animating water that has had something drop in it. Water Splashing up you could create a morphable water prop for that. When do you need this for? Could you tell me more about your project? Is this a potential "product" you would be willing to buy from the marketplace? I hope this helps. Deimos.