On Mon, 25 Jun 2007 08:30:28 CST, "RichToyBox"
wrote:

The head loss Jan mentions is a bit more complicated that 1" per 10" of
pipe. The chart shown at this link
http://www.aquaticeco.com/index.cfm/...Detail/ttid/54
shows that the head loss is a factor of flow rate in GPM and pipe diameter.
A 1200 gph pump would push 20 gpm with 0 head loss. As Jan says look at the
flow chart for the pump to see what flow you will actually get for different
head values for a pump. The chart shows that for 3/4 inch pipe at 20 gpm,
the head loss is 73 feet for each 100 feet of pvc pipe, for 1 inch the loss
drops to 23 ft. and at 1 1/2 inch the loss has dropped to 3 feet per 100
feet of pipe. Elbows, Tees and fittings all add to the head loss.

Yes! More detail. Of course it is more complicated. It always is. ;-) ~ jan
------------
Zone 7a, SE Washington State
Ponds: www.jjspond.us