I'm sure the expert will chime in on this DK. One issue with well water is that is typically lacks oxygen. At 20 gallons per minute you are introducing 28,800 gallons of well water per 24 hour period. A one acre pond that is 9 feet deep contains just over 2,932,000 gallons. Therefore in every 24 hour period you are replacing just under 1% of your total pond water. So if this was continuing to happen over a 60 day period then you have replaced approximately 60% of your pond water during that period. I have no idea what effect that has but I'm sure one of the knowledgeable experts here do. (I'm just a bean-counter that can't resist an opportunity to perform basic math calculations. Consider yourself lucky that I haven't generated line graph or pie chart or something).
How does the well water enter the pond? Does it just pour out of a pipe into the pond, or is there a water fall? What I'm trying to get determine (and I would imagine the experts will ask you) is that is the well water receiving any oxygenation before or at the time of entry into the pond.
We'll let the experts get back to you on answers.
