Today we have a little weather delay so we are going over how to calculate the velocity of the falling structure. It's not just good enough to measure the fall area and the height. We also have to figure out the velocity and the rotational moments because a tall structure when felled will actually launch itself as it develops speed when it falls.
For example, we felled a flare stack that was 200' tall. After it was on the ground we measured from the base of the standing structure to the top of the fallen stack and it measured 230'.