There is something about water that is irresistible to a young child. It is cold, fluid and there is an unlimited supply. All of it equals fun. Learning about these things while in the forest is a valuable part of education. I remember spending may hours digging little trenches in the dirt and running water water down the miniature ditches. We built dams and carefully watch as they failed. It was useful information when, as a teenager, I flood irrigated field of grain and sugar beets.