Currently my ducklings only get swimming water from the water from watering a tree. Unfortunately I cannot water that tree several times a day everyday. I am thinking about building a small concrete pond about the same size as the tree basin and putting a drip type or septic type drain field to several nearby trees. The goal is to make the water last long than 15 minutes (about what it lasts from watering the tree) and to spread the water drainage to more than one tree while avoiding wate waste. Has anyone tried this approach? Results? Ideas? Opinions?