In many countries there is a problem with declining quality of air and water from both industry and construction. What measures could be taken to prevent this?

The picture illustrated the procedure of producing hydroelectric

power

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during the day and night period. There are total seven stages in order to operate the generator for producing electricity. At the

first

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stage, the

water

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from the river is saved in high-level

reservoir

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where the dam nearby.

Next

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, during day time, the gate of the dam is opened so that the

water

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is intake to the

pipeline

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. After that, the

water

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flow from the

pipeline

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cross through the reversible turbines, which for operating the generator in the

power

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station. The

water

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then arrive

Suggestion

then arrives

to the low-level

reservoir

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and the task of

water

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is finished. With the night time is coming, the

water

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from the low-level

reservoir

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is pumped back from the

pipeline

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and across the turbines once again to produce electricity as the fifth stage. At the sixth stage is that the

water

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flow is pumped back through the

pipeline

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and

finally

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the

water

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is saved back to the high-level

reservoir

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. After the whole hydroelectric

power

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system run down, the generator could send the electricity to the national grid through the

power

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lines.