Engineering - Water Dam Catastrophe

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 This happened in Italy in the mountains in 1963.
https://maps.app.goo.gl/3AMo1ovDLnweJMZq5

In the Alps there is a village called Vajont, where a huge dam was built in 1960 and it was 260 m tall. It was generating 200 MW of electricity continuously. It's enough to power 2 million 100 W light bulbs. 

After the disaster water destroyed a few villages. But the dam was left standing there. How did water get through the dam without destroying it?

Watch skipping through the video:

https://drive.google.com/file/d/1nL0H1thTZohpK-MQdJSCfj6K5lOzEExt/view?usp=drive_link

Answer questions
1. Why did they build the dam?
2. Was it strong?
3. How many years did it last?
4. Why was the nearby mountain called `walking`? What is special about its geological layers?
5. What did you remember from the viddeo?





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