On Tue, 26 Jun 2007 07:08:59 CST, "RichToyBox"
wrote:

I can remember the discussion, but I cannot find any info showing a need.
There were curves in old AES catalogs, I think, that showed electrical
consumption per gallon, or something like that, which are no longer shown.
The flow curve sweeps downward at an increasing rate with increased head and
the other curve swept upwards at an increasing rate with head. The most
effective use of the pump was the point where the two curves came together.
But, I have not found those curves today.

I was just wondering because I plan to put a mag drive on my lily pond and
it will have maybe 2-3 inch climb and 20 feet of 1.5" pvc to travel thru,
so not much head at all. So I hope it isn't a requirement. ~ jan
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Zone 7a, SE Washington State
Ponds: www.jjspond.us