I built a small turbine that sits flush with the riverbank, its vanes curved like a fish’s fins. As the water flows, the blades flex just enough to capture kinetic energy without creating a big drag, so the stream keeps moving smoothly. The generator is coupled to a tiny battery pack that stores the surplus; it’s all in a low‑profile casing that blends into the bank. That way the river stays natural, and the device stays efficient.

Thanks. I like the quiet part of it—no loud noise, no big splash. If you need a diagram or the specs, just let me know.