Pond Boss Forums INTRO Questions & Observations pond turn over?

I don't know if "turn-over" is the correct term. Turn over that happens up here in the Fall when the upper water cools down to 39�F. That water sinks to the bottom, and becomes the warmest water in the pond. The water that is colder than that is less dense, and rises.

The same thing happens in the Spring, when the water warms up after ice-out. Once the surface water warms up to 39�F, it sinks as well, mixing with the water on the bottom of the lake. As the surface water warms up past 39�F, it stays on top. That's why you aerate from the bottom during the summer, you are bringing the denser, cooler water up.