Pond Turnover

Joanna visits with Jason Phillips, Simpson County Extension Agent for Agriculture and Natural Resources, to discuss pond turnover.
Pond turnover is a term used to describe the mixing of stagnant waters in a pond. This process will often occur during the first cool days, or nights of early fall. Pond water that has sat in a pond basin throughout the hot summer months tends to stratify. The sun warms the surface waters, while cooler, more dense water sinks to the bottom of the pond. Unless there is a heavy, cold rain or strong winds, this water will remain at the pond bottom until air temperatures cool the surface water. Cool fall weather will force the water column to mix. Water which has sat on the pond bottom all summer is generally deficient in dissolved oxygen. Little sunlight reaches these depths. As a result, these waters will support little oxygen producing algae or plant life. The only way to prevent pond turnover during fall is to prevent the stratification of waters during hot weather. Mechanical aeration and water circulation are the only reliable methods of preventing these occurrences.
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