Sunil, great question.
There is a chance I will see it, because it is exiting at 400 gallons per minute per my calculations. It could be a "big ole hole".
I highly suspect two areas.
1. The original dry stream channel, where the spring went under due to some sort of fracture. I actually sealed from the place the small spring went under, all the way to the dam. It may be fractured futher up than what I had thought.
2. The area where I sealed another small wet weather spring.
The tactic I will be taking is this, as soon as it stabilizes, assuming it does at the 1 acre or above level it has been known to hold, I will insert markers, all the around. Then I'll look for the leak. If I'm unable to find it, I will wait for a rain to lift the water level a bit, and then start searching around the edges, especially in suspect areas.
One thing about a massive leak, it should be more detectable than a root leak or something like that.
My biggest advice to anybody out there, do not build in Karst regions, unless you have more money than sense.
There are few prettier states than TN. But those hills have limestone, shale, and sandstone, rock all of which are pond killers.
