Harry Bloomfield, Esq. wrote:
Tim+ expressed precisely :
Nonsense! Have you actually tried it? Ive syphoned water plenty of times
and never had to keep the outlet underwater.

As have I, it works fine on small pipes, but have you tried it on
larger pipes - I have. Air rushes up above the water from the discharge
pipe and soon breaks the syphon effect.

Only if your inlet is obstructed and the flow is very low. Otherwise the
water velocity is too fast to allow air back up.

If the discharge is kept below
water, then air cannot be sucked in.


Well thats true, but not necessary in my experience.

Tim

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Please don't feed the trolls