Dropped the clarity, eh? It's always something, isn't it? :-)
I believe the clarity change is caused by the top few inches of water containing chaff that expands as it becomes water logged. If a person could get a clarity reading below the soggy chaff layer (SCL) the water is probably much more clear.
It follows then that the clarity of the water column could be far different than the clarity of specific layer of water within the water column.
