The Kaplan-Turbine is a type of water turbine used for hydroelectric power generation. It is designed to operate efficiently at low water heads and variable flow rates. The turbine features adjustable blades, allowing it to adapt to changing water conditions, which maximizes energy extraction. Invented by Viktor Kaplan in the early 20th century, the Kaplan turbine is particularly effective in run-of-river hydroelectric plants. Its design includes a propeller-like rotor and a guide vane system, which directs water flow onto the blades. This adaptability makes it a popular choice for modern renewable energy projects.