Well water is oxygen depleted when it comes out, so anything you can do to have it hit the air before going into the pond would be beneficial.
You would have to do the math and figure out how much you are losing due to evaporation and seepage.
My pond is just under 5 acres and it takes quite a bit of water to keep the water level constant.
These 10-20 gallon a minute solar and windmill wells are pointless for a pond your size
