Stick a garden hose in it and turn it on. Look for a wet spot or and exit point.
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I tried this the over the weekend and as I feared it filled within seconds and the pressure buildup kept pushing the hose out. It rained pretty hard Monday night, filling the pool above the overflow. Nearly two days later the water level is basically the same. One more rain like Monday night and we'd be really close to the pool overflowing.
Technically, our PB has met his obligation of adding an overflow line. In hindsight I wish I would have known enough to ensure it was a side wall 2.5-3" drain line vs the 1" in skimmer line.
When I asked the PB, he advised that it drains into the ground, specifically the gravel bed under the gunite shell. He also said that if the ground/soil is damp (ours typically is), it may take a few days to drain and that it is not meant as an immediate emergency drain line. From what I've read here and elsewhere, this isn't too uncommon but still concerning.
Any other thoughts or opinions? Our pool will likely be drained next week for our refinish. Is it possible, or worth it, to either rerun the drain into a French drain or some sort or a pop up bubbler? Or actually add a standard overflow line in the side of the wall? That side of our pool only has 4 feet of pavers from the coping to yard and our sod isn't down yet, so I am just considering all options now while it might be cheaper and easier to address than later.
FWIW, our neighbor doesn't have an overflow line in his pool and only very rarely needs to drain it from the equipment pad. But since we live in South Florida, I also don't want to be sweating the water level during hurricane season.
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one way to look at it is it cost me all of the bs we've been through. Brian, you are always raining on my parade! Go jump in your pool! 
