Mike Patterson wrote:

Really like my new pond, finally seem to have the surrounding drainage
problem and the Mysterious Water Loss After Heavy Rain problem fixed,
so now I'm thinking...

How about if I run black gas pipe out to the the back end of the pond,
put on a valve there, then something like icemaker tubing into the
pond so that gas bubbles up near the center, then light it.

How about a glass or plastic tube for in the water, comming up to the
surface? It should not be any more intrusive than the bubbles.