I too am thinking about a well-fed trout pond (in central Indiana). I would like the trout to reproduce. The pond would be earthen. I was hoing to use a household submerged pump during warm weather, and let it run artesean when colder. How can I calculate how big and deep to make the pond in order to keep it cool enough? I would like to use the incoming water for aeration, but that will warm up the water. Any input on pond design and how to let the water aerate before it enters the pond is much appreciated. I was thinking of a small/short rocky stream for the water inlet. Is planting trees around it for shade a viable idea?