The dam generally does not eject water. Water passes through the turbine tunnel to drive the turbine generator to produce electricity. Only when there is an emergency water release during a flood are the gates opened to release the water. The water spray you see on TV doesn't happen every day. If water is released like this every day, it is a waste of hydraulic energy. .
You don't know enough about hydroelectric power stations. Not only the Three Gorges Hydroelectric Power Station, but other hydroelectric power stations do not produce electricity after discharging floodwaters. They use the dam's diversion tunnel to divert water from the reservoir. area to the turbine to drive the turbine. The generator produces electricity. Flood evacuation is a means of regulating water volume and storage capacity rather than a means of producing electricityity. The flood gate is much higher than the water outlet of the turbine, and the water outlet of the turbine is usually at the bottom of the dam. . When you see a lot of water flowing under the dam. When there is a surge, it produces electricity.