Who is Viktor Schauberger ? https://en.wikipedia.org/wiki/Viktor_Schauberger

Today the Austrian forester Viktor Schauberger is considered to be a pioneer of modern water research and the holistic observation of Nature. As early as the first half of the 20th century he gave urgent warnings of the consequences of uncontrolled exploitation of the environment. As a way out he proposed a radical rethink and the development of totally new concepts of energy production, in harmony with Nature. Schauberger formulated his “C & C principle”: first one has to comprehend Nature, and then one should copy it. The applications of his ideas and his inventions include devices for refined drinking water, spiral pipes for carrying water with reduced friction, environmentally-friendly river regulation, as well as power generation from water and air using the principle of contraction and inward vortexing.