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Hydropower from the Greek word definition hydro water is vitality that originates from the power of moving water. The fall and development of water is a piece of a constant common cycle called the water cycle. Vitality from the sun vanishes water in the earth’s seas and waterways and draws it upward as water vapor. At the point when the water vapor achieves the cooler air in the environment it consolidates and shapes mists. The dampness in the long run tumbles to the earth as rain or snow recharging the water in the seas and streams. Gravity drives the moving water transporting it from high ground to low ground. The power of moving water can be to a great degree amazing. Hydropower is known as a sustainable power source on the grounds that the water on earth is ceaselessly recharged by precipitation. For whatever length of time that the water cycle proceeds with we won’t come up short on this vitality source.
Worldwide, hydropower is a crucial power supply option for several reasons. First, it is a renewable energy resource that can contribute to sustainable development by generating local, typically inexpensive power. Second, hydropower reduces reliance on imported fuels that carry the risks of price volatility, supply uncertainty and foreign currency requirements. Third, hydro systems can offer multiple co-benefits including water storage for drinking and irrigation, drought-preparedness, flood control protection, aquaculture and recreational opportunities, among others. Finally, hydro can allow more renewables, especially wind and solar to be added to the system by providing rapid-response power when intermittent sources are off-line, and pumped energy storage when such sources are generating excess power.
Hydro dams is easier to build a hydropower plant where there is a natural waterfall. Most dams were built for recreation, flood control, fire protection, and irrigation. A dam serves two purposes at a hydropower plant. First, a dam increases the head, or height, of the water. Second, it controls the flow of water. Dams release water when it is needed for electricity production. Special gates called spillway gates release excess water from the reservoir, during heavy rainfalls.
Hydro plant as people discovered centuries ago, the flow of water represents a huge supply of kinetic energy that can be put to work. Water wheels are useful for generating motion energy to grind grain or saw wood, but they are not practical for generating electricity. Water wheels are too bulky and slow. Hydroelectric power plants are different. They use modern turbine generators to produce electricity, just as thermal (coal, natural gas, nuclear) power plants do, except they do not produce heat to spin the turbines.

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