Where does the water go?

A child pours water into a flex tube at the top of the crate. After he pours the water, he tries to see where the water goes by looking through the crate at the tube. He steps down from his stool to look at the end of the tube on the other side of the table next to the waterfall apparatus. There is still a dribble coming out. Another child grabs the end of the tube as if to say: Yep, it came out here. The child who poured the water is not entirely convinced so he squats down to get a better look at the tubes as they pass through the crate. He stands up and goes around to the front of the crate, again to get a better look at the flex tubes in the crate. He moves back around to the side all the while trying to figure out the flex tubes. He reaches under the waterfall apparatus to scoop some more water in his bottle. This time as he pours, he is only concentrating on the end of the tube that wraps around and under the wooden tray. That is not where the water exits, but he is testing his theory. He reaches under the waterfall apparatus to grab the flex tube under the wooden tray. He bends it down to see if any water comes out.