If you can melt a hole through the ice, siphon out a 1/2" air gap between the water and the ice, the plate of ice can be a 'double glaze' insulation keeping the water surface from further freezing for a week or two
Great idea, but cold weather and wind will refreeze the hole you opened. A solid heated tube like what a pond breather provides is best.
Your quite the inventor and I give you lots of credit. I used to gets lots of thick ice on my bottom pond before I covered it with a cold frame. Back then I would top off bottom pond from houseOn a still pond,with that hole for ventilation, the fish will huddle down in the 40f bottom of the pond, patiently waiting for Spring. For months.
I give you much credit for coming up with a workable solution to your winter problems. I used to get lots of snow and ice on bottom pond and I used to top up that pond with warm water with hose running out of house during a warm day. That would raise the water to just above the ice. The water flowing all year from upper ponds would create friction on ice edges and wear ice away quicker. At night it would refreeze again but at least there was always a hole from where the water would flow from upper ponds. The water would refreeze and make a ice cap and that would insulate the pond too. It did help to keep ice thinner and i aways still had a breather hole from where the water poured into from upper ponds.On a still pond,with that hole for ventilation, the fish will huddle down in the 40f bottom of the pond, patiently waiting for Spring. For months.
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