My raised pond is 3 feet above groundA raised pond gets colder than s sunken one
So a 24” deep pond above ground will be to cold for fish in winter
Even goldfish need 36”
Unless you remove the fish during the winter months
A bottom drain is not overkill
Yes it has to go somewhere
They are not expensive use 2” on small ponds
Take it to a butyl lined filter bed (2 compartments) connect a pump and pump water down to a grid of pipes drilled so the water comes up through the filter media then falls back into the pond
You can plant the filter bed
You can even use it to grow veg (hydroponics style)
All depends on if the water is above or below the surface level of the media
Use the expanded clay media = lightweight good surface area and allows a good flow
Easy to maintain
Pump is easy to access
Can isolate filter bed
Very simple to do
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And 4 feet below ground. 6 feet of water. Double block thickness. Back filled with concrete.
Keeps the cold out. In winter.
My fish used to go to the bottom in winter.
Last winter I decided to put a cover over it and shut my top pond down.
That water falls into lower pond to stop the chill factor.
It worked. All my fish where fully up swimming around all through the winter.
Even on the days and nights it was 5 to 7 degrees below freezing.
The pond temps stayed around the 8c to 10c all the time.
So in my case. It was the surface area wind chill doing the damage. And not the walls of the pond letting cold through.
A lot of people now use Celebrex before fiberglassing there raised ponds. Instead of rendering to keep the cold out on raised ponds.
Mine is rendered and fiber glasses
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