Yes you are correct. I will see if I can put together a picture.

When we built the pond this old clay tile was there but we didn't know. It now runs right through the middle of our pond. The top end is not a problem as it runs water down hill into the pond. The bottom end is the problem. It acts like a drain.

When we took out the 25 feet of tile the 4" was running full. I mean we thought that the end must be wide open in the pond it was running water so well.

Now that the water in the pond is down about 12"s from full pool the pressure is slowing the leak. See we changed the grade so much from where it was with building up the pond banks with heavy clay that the tile could be 8 feet down right next to the pond on top of the pond bank.

I will draw a picture up.


[Linked Image from corvettejunkie.com]
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7/8th of an acre, Perch only pond, Ontario, Canada.