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The given diagram explains the generation of electricity in a hydroelectric

power

station. Overall, it can be said that the whole

process

is depended on the high-level

reservoir

and the low-level

reservoir

, the

water

flows from the former

reservoir

to the latter

reservoir

during day time and

conversely

at night. As shown in the

process

, during the daytime, when the dam is opened the river

water

stored in the high-level

reservoir

flows to the low-level

reservoir

through the reversible turbines located in the

power

station. The

water

flow rotates the turbines and which makes the generator operate, and

then

the generator provides

power

to the national grid through the

power

lines.

On the other hand

, during the night reverse

process

take place the

water

is pumped from the low-level

reservoir

through the same reversible turbines to the high-level

reservoir

and once the

water

has reached there the dam is closed to preserve the

water

for the

next

day

process

.