2. We put more rocks at the bottom and added Play-Do and clay instead of just clay. We also use brown clay instead of yellow and red [ The one in the picture ]. These changes helped a lot except the big rocks at the bottom, it prevented
3. With the last model, the water did not run as smoothly through the hole as the model before. The model demonstrated how a real river flows and works.
I think that I would have had trouble poking the holes in the cup for the rain.