The upper lift limit for a siphon is the atmospheric pressure expressed in feet of water, approximately 30 feet (as opposed to the 29.5 inches of mercury the barometer on the wall next to me is reading). Temperature does not get into it (except that it's hard to siphon ice).

I believe increasing the height of the drop on the outlet (greatly in excess of the height of the inlet rise) may increase the rate of flow. It will not lift water more than the atmospheric pressure (30 foot) lift limit.

Thanks for posting the pics, Ranger. That's a lot of pipe and a lot of water flowing out.

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