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Somebody with real pond building experience should jump in here. Meanwhile, my thoughts are: With pond shape fixed, I think counter-clockwise current will work better in relation to the bottom drain. I'd place first return near the skimmer against "East" pond wall, about 1.5 feet down, angled slightly downward to aim for the "Northeast" corner, and flowing along the east pond wall. Second return would be on the "North" wall near the Northeast corner, angled slightly downward etc.; and third return would be placed likewise at the "Northwest" end of the westerly wall. Idea being to create as much of a circular movement around the pond as possible. Good luck!
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