Hey guys I apologize if this has been covered but I swear the search function hates working for me.

Being in the excavation business digging a hole is not that big of a deal for me. Since the price of GSH is so expensive I was considering building a forage pond for them. This leads me to a few questions.

How deep should it be for them to survive a northern Illinois winter?

If I were looking to get approx. 200# per year to stock in the pond how large would it have to be? Looking to make it a self sustaining system.

What other things should I consider when making this decision?

I appreciate all the help!