designing a new pond - bottom drain, skimmer, etc
We just bought a new house - so I get to design a new pond.
First, a little background ... I have kept a successful pond for 17 years at our old house - but it was a small, shallow, concrete pond, with a simple filtration system - just a submursible and mini skippy type filter in a 5 gallon pail. The goldfish were caught every fall and brought inside for the winter. The pump and filter was also brought inside.
For the new pond, I am thinking something like 6 feet x 8 feet and 30 inches deep - around 800 gallons. I am considering a bottom drain and a skimmer feeding a skippy filter. I kinda like the idea of an external pump.
I have alot of questions - but here is the first. I have been reading everything I can find online - but I am really confused by what happens in winter. I live in Wisconsin where the temps will hit to 20 or even 30 degrees below zero. How do you you prevent cracking the pipes and skimmer ?