At first, we discussed where rain comes from and what a flood is. We read books and talked about what would happen if it didn't stop raining for a long time. We examined where the rain went outside and learned about the sewer drains.
Let’s pretend that the weather forecast says that it is going to rain for the next 50 days. If it rains for the next 50 days where do you think all that water is going to go? The water is going to cover everything that we see - houses, cars, schools, roads, trees.
Your group needs to make something with the materials the teachers provide that floats long enough to keep two plastic friends (lying down) out of the water for two minutes.