How do I make a multistory waterfall?
I want to put in a multistory waterfall that starts at the roof line of the third floor and cascades down to the first floor. I am starting bottom up. But adding the part on the second floor results in the "it is not structurally sound" error message when I try to commit the change even though the part on the second floor is right above the part on the first floor. I am using the straight down part for both the first and second floor.