I think the answer to this is either a 'no' or a 'not very well' based on the research I've done so far but I thought I'd throw it out before I put together the test system to see if anyone else has done it.

My large pond and my small pond are only separated by the levee of the small pond. Difference in surface height is around 3 feet higher on the small pond.

I want to drain the small pond and do a reset...restocking plan has been discussed on previous posts.

The issue is that the small pond (just under 1 acre, fairly deep (average of 12 feet) has a lot of water in it. It doesn't get a ton of runoff so if I can get it down to nothing I'll be golden. By my calculations it'd take over a week with a 6" pump - that's an expensive job.

But the issue is, I think the back pressure of the large pond's water level would either prevent or seriously slow down the venturi effect of the siphon The outlet of the pipe would be something around 8 feet under the surface of the big pond.

Anyone every tried this?

Dale

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"When tempted to fight fire with fire, remember that the Fire Department usually uses water." - anonymous