Garibaldi Lake Task

  1. How much water does the Barrier contain behind it in the lake?
  2. If the Barrier faulted, what do you think would happen? How much water would escape and what kind of power is the escaping water equivalent to?

The Barrier is a natural dam that holds back the water from Garibaldi Lake escaping and flooding into the valley below.


  1. When you take the average depth of the lake (119 m) and multiply by the surface area of the lake (9.94 Km2), you convert the depth into kilometres, 0.119 km x 9.94Km= 1.8286Km3converting this into cubic meters is multiplying by 10003 m, 1.8286 10003 = 1,828,600,000mwhich is equal to 1,828,600,000,000 L. The Barrier is holding about 1,828,600,000,000 L of water.
  2. The maximum depth of the lake is 258.7 m and the Barrier height is 243 m so the difference between the bottom of the lake to the beginning of the Barrier is 15.7m. If the Barrier was faulted, depending on how big or a crack and where this is would determine how much water would escape and how fast. If all the water that the Barrier was holding would escape there would still be a depth 15.7m containing water in the Lake so not all the water would escape. If the water was only 119m deep, a depth of only 103.3m of water would escape whereas if the depth was 258.7m, a depth of 243m of water would escape.