Someone above suggested using quick setting concrete. After seeing your temporary fix, if you have the flow stopped that might be the best "easy" fix.
The argument against doing that would be that you could not open the valve and drain the pond if you wanted to. But all you would have to do is dig the pipe back into the dam past the concrete and cut it. Then put a new valve on after the pond drained.
I would think you would need the flow completely stopped or a small trickle could force a water channel through the concrete while it was setting up.
If you do concrete it up, cover the whole thing up with dirt deep enough so the pipe does not freeze and break behind the concrete.
This is the problem I see with through dam drains. At some point ten or twenty years down the road, they seem to be problematic for one reason or another.
Last edited by snrub; 10/24/17 10:20 PM.
