Now this is just my simple mined self taking here but couldn't you just put a 90 degree elbow on that pipe and go up 15 feet with pipe and then put another elbow on it and take it back over your dam and into the water? Make it into a recycler if you will. I know that's not a fix but wouldn't the pipe fill up eventually and flow back out into the pond? Or is that a real stupid idea?
That idea was one of my "brain-storms", too, and what triggered my friend to suggest a water ram. Water does not travel very well uphill. From what I understand, by just putting a hose or a series of elbows on the leak and re-circulating it upward, the pressure at the leak level would probably break open another leak site instead of pushing the water upward.
