Best guess would be rain water ran under the liner and lifted it then the
rain stops and the water under the liner is absorbed into the ground before
you saw it floating up. This will cause the pond to lose (over flow) an
equal amount of water to what was under the liner. You should find look for
areas where run off and/or overflow can get under the liner.
Dave

-/-

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"gng" wrote in message
...
|I have a 2500 gallon pond, cement with liner, and woke up the other morning
| to find that half the water was gone! I found a small hairline crack
along
| the smaller waterfall - perhaps a foot long. The water flows over the
| crack; the crack is not submerged. I patched it and everything seems
fine.
| Does this make sense that this was the problem? 1200 gallons down in 12
| hours? It was raining hard that night so I could not tell if it was wet
in
| one area or another. I had this problem before but I would lose maybe 2
| inches a day, not a foot and a half of water in a night.
|
| Also, now that I am paranoid, I had this idea for how to stop the pump if
| the water drops. I have a 1/5" intake tube that goes to the bottom of the
| pond. If I put a T coupling on it a couple of feet from the bottom, if
the
| pond ever dropped lower than that would I not lose prime and suction -
| hence, causing the pump to stop pumping the pond dry?
|
| Gary
|
|