Work your way around the pond with a dropper of milk. A drop where you
think the leak is will show you a leak by being drawn through the hole
instead of dispersed in the water. You could let it drain to a stopping
point, add about 1/4" of water, then do the milk routine.

Good luck.

jim

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"Ann in Houston" wrote in message
...
Is it possible for a leak in the bottom of the pond to only drain the
water
down to a certain dept, and not empty the whole pond?