Above is the winter of 1996-97
|Above is the winter of 1998-99|
It was a warmer than usual winter but there were a couple months that the pond had iced over.
|This pump causes more waves but doesn't keep as big an area open as the pump in the lower right picture.
I have the pump just under the surface to do some trials on water stratification. I sampled water temperatures at the 4.5 feet depth and at the surface and the temperatures were the same, just above 32 degrees F.
|The second pump forces water toward the shallow end. I have the hose just under the surface and even with very little surface agitation this pump keeps the water open over a larger area than the pump above.
I wanted agitation in this area because there is a shallow divider ledge with only a 10 inch water depth. During the winter of 1996 we had an all time record of 133 hours below zero F and the ice was 8 inches thick at this point.