Calling it a day
This was far from the end of the project, however. The engineers now had to put everything back where they found it, a little like you want your builders to do when they come and do some work in your home! The dam they had placed upstream to divert the water needed to be removed.
This took a long time and a lot of people, and couldn’t be done in one fell swoop. Small pieces of the dam had to be removed first, to ensure the water didn’t flow too fast all at once. Before demolishing it completely and having the last of the debris sent down the Falls.