Okay, well here’s the real scoop!
They tried several different absorbent materials and measured the water leakage. After determining how much water leakage there would be for each material the groups would decide what to use. Well, okay, this part worked pretty well. It was actually fun once I worked out the kinks! (Just imagine teams of kids pouring water that you know is going to leak and then pouring it again to measure it. You need towels!)
Then we moved on to the flood barrier part.
Whether they need it or not.