I don't know

Mike Patterson wrote:

I have a 1200 US Gallon pond with an overflow spillway at one end.

If I fill it up, it seems to hold it's level fine, but after a really
heavy rain (we got about 3 inches in 4 hours a couple days ago), the
water level after the rain was about 3-4 inches LOW.

I filled it back up and it has held the correct level for 2 days since
the rains.

The only thing I can imagine to explain this is some sort of siphoning
action that only gets started when the pond is heavily flooded but
that breaks when the level gets low enough.

Any other suggestions or ideas from the crew?

TIA
Mike

Mike Patterson
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The question isn't "are there weapons of mass destruction?",
the question is "who has them now?"

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