Hydroelectric power plants can generate huge amounts of electricity. Which of these statements best describes the impact of a hydroelectric power plant on the environment?
It pollutes the air.
It reduces the level of groundwater.
It causes floods in vast areas of land.
It contaminates surface water by dumping wastes.

Hydroelectric plant is a system with three major parts , a power plant where the electricity is produced, a dam that can be opened or closed to control water flow, and a reservoir where water is stored.

The working of hydroelectric power plant is:

At the plant level, water flows through a pipe also known as a penstock and then spins the blades in a turbine, which, in turn, spins a generator that ultimately produces electricity.

Most conventional hydroelectric facilities operate this way, including run-of-the-river systems and pumped storage systems.

In this whole process ,So much water should be used to generate electricity therefore it reduces the level of ground water.

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