thanks for the help FishinRod. I was suspecting that this pond would be a groundwater pool. The drain that currently connects to it runs weeks after a storm continuously, I just cant imagine that much surface water being there, but good idea on that test, I can give it a try. My area is known for the glacial till, so I suspect that contributes to this.
Could you explain why you think there could be a good chance there is a hydraulic connection between my foundation and the pool? Is this something that you've seen before? This is my hopeful wish ofc.
Unfortunately my foundation level is relatively flat, slightly sloping down, not enough to make a pond, I am lucky that I have the slope uphill to drain this water in the first place.
