Hydroelectricity and tidal barrages

What does a dam to do water flow

It blocks/ restricts the flow of water

What happens to the waterlevel when the dam is built

The water level becomes giher on one side

Why does the water level rise behibd a dam

Because the dam prevents water from flowing away freely.

How is this principle used in real life

Hydroelectric dams
Tidal Barrages

What do hydroelectric dams do to water upstream

Trap water, forming a resevoir

How do tidal barrages use tides to generate energy?

They trap water as the tiode comes in

What happens after the tide goes out in a tidal barrage system?

There is a higher water level on one side, which can be used to generate energy

What arethe advantages of both systems

Produces large amounts of energy with no pollutants
They are a reliable source of energy
They work on a large and small scale

What are the disadvantages to both systems

They stop boats and fishes from travelling
Initial set up is expensive
Flood huge ares and villages