The information plotted from the Secchi disk readings
has also verified the effect seasonality has on lake clarity.
Around late December or early January, the surface of the lake cools
significantly, causing the heavy surface water to sink to the bottom
of the lake. This is a naturally occurring cycle in this climate,
and is beneficial to the overall health of the lake by taking oxygen
rich surface water to the bottom of the lake to support aquatic
life forms and mixing the layers of water. This is commonly referred
to as lake "turnover". This action, while beneficial,
also picks up the fine clay sediment from the bottom and places
it in suspension for a time.
In the warmth of late Spring and early Summer, this turnover stops
and sediment falls slowly back to the bottom, and clarity improves.
As the summer heat intensifies, the slight lowering of clarity is
probably the result of some algae growth. This would be a danger
time if the nutrient level of this lake should become excessive.
Fall gives us the best clarity readings. Cooling weather, less activity,
and normally reduced rainfall will keep the lake looking clear until
it turns over once again.
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