Hydropower or hydraulic power is the force or energy of moving water. It may be captured for some useful purpose. Prior to the widespread availability of commercial electric power, hydropower was used for irrigation, and operation of various machines, such as watermills, textile machines, and sawmills. A trompe produces compressed air from falling water, which could then be used to power other machinery at a distance from the water. History Hydropower has been used for hundreds of years. In Ind… (More on Hydropower)