Garibaldi Lake Task
To estimate the volume of the lake, you can multiply the given surface area with the average depth (119m).
To find how much water is behind the Barrier, I first converted the surface area (in km) to meters. Then using the surface area in meters, I multiplied it with the average depth to find the total volume. I knew that 
If the Barrier was to collapse, all the water that contained inside would pour out and flood Squamish. All the trees on the mountains would collapse and fall down on the bottom of the mountain. Not all the water would escape because the bottom of the lake is not flat or slanted that would cause all the water escape. There are some deeper sections of the lake(concave shape), so if the Barrier was to break, there would still be some water left in the deeper sections.
The power of the water coming down out of the lake would be equivalent to “200 times the energy released by the bomb on Hiroshima”, according to Steve Quane, a professor of geology from Quest University. It is 200 times bigger because it is from 1400 meters elevation and 1 trillion litres of water. Quane said, “If the barrier were to explode or all apart in an earthquake, the wave produced by all the water flowing out of Garibaldi down into Squamish would be 120 meters high.”, so that would be a humongous amount of water flooding down.
In conclusion, I found this assignment interesting because we got to find the volume of the lake and how much water was in it. Since it is not common for me to find measurements of a lake that is a irregular shape, I thought it was a cool thing to learn and to know for the future. When I found out how much water was in the lake, I was surprised by the amount and wondered how much water would contain in the whole ocean.
References:
https://en.wikipedia.org/wiki/Garibaldi_Lake
https://en.wikipedia.org/wiki/The_Barrier
http://www.squamishchief.com/news/garibaldi-lake-a-ticking-time-bomb-1.1753732