On Mon, 08 Oct 2007 17:36:59 -0700, Keith Hughes
wrote:


... If you *pump* the water up
the columns, evacuating the headspace as you go, until the columns meet,
you can siphon pretty much any height you want.
...
Keith Hughes


No, you cannot syphon to any height.
Yes, you can pump to any height, within reason.
There is a difference.
If you pump to 40 feet head, quite filling an inverted u-tube, for
instance, when the pump is halted, the water falls until a particular
maximum height is no longer exceeded, if the foot of the u-tube is
opened to water whose surface is at atmospheric pressure..

Brian W