WHAT WOULD HAPPEN ID THE BARRIER BROKE
If the barrier did break, the majority of the water would drain out of the lake, but since there are uneven depth of the lake, some of the water would stay in the depth of the lake. From the force of the water, most of it would drain from the gravitational pull.
I used https://en.wikipedia.org/wiki/Garibaldi_Lake to do my research to get the surface area and the average depth of the lake. I used any past knowledge to conduct the rest of my research to find the estimate volume of Garibaldi lake.