Hydroelectric power generation is a power generation system in which the gravitational force of falling water reserved by a dam revolves the hydraulic turbine in the generator. Flowing water has potential energy, kinetic energy and pressure energy, and these energies of flowing water is called hydraulic power. Hydroelectric power generation is roughly divided into the "general hydroelectric power" and "pumped hydroelectric power" types. The general hydroelectric power means power generated by using the water in rivers or reservoirs. The pumped hydroelectric power is generated by pumping up water in a lower level to the upper reservoir during nights when power consumption is small and dropping the water in the upper reservoir down to the lower lake during daytime when power consumption is large. The structures of power plants include the "dam type", "waterway type" and "dam and waterway type". In the dam type, water is reserved by the upstream dam and dropped down to generate power through use of gravitational force.
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