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

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

first

stage, the

water

from the river is saved in high-level

reservoir

where the dam nearby.

Next

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

water

is intake to the

pipeline

. After that, the

water

flow from the

pipeline

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

power

station. The

water

then arrive

Suggestion

then arrives

to the low-level

reservoir

and the task of

water

is finished. With the night time is coming, the

water

from the low-level

reservoir

is pumped back from the

pipeline

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

water

flow is pumped back through the

pipeline

and

finally

the

water

is saved back to the high-level

reservoir

. After the whole hydroelectric

power

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

power

lines.