Thank you all for your replies. My husband and I decided to just start digging in the yard - lol. Probably a bad idea, but we are just frustrated. So we started at the pool house and dug a bit until we found PVC. Right at the concrete foundation water was just streaming out. We are sure it is a pipe under the concrete in the pool house. We found large tree roots wrapped over and under a few pipes. In looking in the pool house - you can see where this area of concrete has been cut out in the past. I think we could probably fix the leak if we can get someone to break the concrete up for us - softly haha without causing more damage to the pipes.