If there was only one pipe or doesn’t really matter if there is a screen or not. If the pipe had a cover she would have still been stuck on the bottom and no one likely would have been able to get her out of the water. If a second pipe had been there the pressure wouldn’t have built up enough to suck her in.
It’s made by a Coen brother just not the ones you think. Mel Brooks’ real last name is Coen and he is the younger brother of the others. He adopted “Brooks” when he broke into directing so he wouldn’t be accused of riding his brothers coattails to fame.