The diagram below shows how electricity is generated in a hydroelectric power station. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The given diagram illustrates the process of electricity generation in a hydroelectric

power

station

.

Overall

, it can be seen that the main facilities are the

dam

and

power

station

that control the

flow

of

water

.

Additionally

, the direction of the

flow

is different on the day and night. The

Dam

,

Remove the comma

apply

show examples

is built on the high-level

reservoir

of rivers,

operates

Correct word choice

and operates

show examples

differently depending on the time of day. In the daytime,

intake

Correct article usage

the intake

show examples

of

dam

Correct article usage

the dam

show examples

open

Wrong verb form

opens

show examples

, and

water

flow

Correct subject-verb agreement

flows

show examples

down through the

power

station

in order to generate electricity,

then

it

arrive

Change the verb form

arrives

show examples

the

Change preposition

at the

show examples

low-level

reservoir

. The

flow

of

water

through the reversible turbines of the

power

station

, which operate

generator

Add an article

a generator

show examples

to produce electricity and through the

power

lines to

national

Add an article

the national

show examples

grid. In the night, the whole process is reversed. The reversible turbines of

power

Correct article usage

the power

show examples

station

pump

water

from the low-level

reservoir

back into the high-level

reservoir

. Concurrently, the intake gates of the

dam

are closed so that it

avoid

Change the verb form

avoids

show examples

water

flow

down.