As permaculture teachers, we have landed on this simple clay-model demonstration as an excellent tool for explaining earthworks. We can cover how swales, ponds, key points and key lines all fit together. The appreciative response from our students continually confirms this.
While the city of Chicago was shutting down due to too much rain last week just 60 miles north of us, the swales, ponds, berms and rain gardens we have put in around our home and in Stelle did their job of filling up and holding water back from the creeks. Over several days they will slowly release that water into the water table rather than let it run down into our creeks and rivers all at once.