BrentD, you might want to contact Otto for some consulting advice. He's a wizard when it comes to pond construction. Hopefully he'll see this thread and chime it. I believe he does paid consulting as well as actual heavy equipment work.

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)