Well, I tried to carry the water back out, but there was too much of it... Then I tried going through all of my master's spell books to find a solution, but by then the water was so high, I had to use it to float!
... So, uh, I didn't stop it. That was about the time my master came back. All he had to do was wave his hands, and the water sank, and the brooms fell over, normal as wood.