I am located in southwest georgia where our winters are mild and our summers are hot(we are always humid). I have noticed that many of the ponds/lakes mentioned on this site are 20 to 30 foot deep. I know that a deep pond can be easier to aerate, especially if the deep part is close to the middle. What are the other reasons/advantages? Is it due to cold weather? We are swampy and flat. This means to have a pond 20 foot deep we have to do a lot of digging.