....
I'm no expert on these but most of the water well jet pumps have a fairly
high percentage of inlet water to outlet water. Someting on the order of
1/2 the output is pumped down the well. The other thing is that the the
pressure is not that high. So you need high volume, medium pressure.

I also have a 15 hp. irrigation pump I could use as the pressure supply. It
puts out 140 gpm at 125 psi . I thought this was overkill, but I don't care.
I need to create maximum suction and have large opennings. The stuff at
the bottom of the pond is liquid but very heavy - moose muck. I sucked a
rock into my centrifical trash pump and stalled it. (Kids LOVE to throw
rocks in water - skip-skip-skip) Would this work better??

Karl




For your 10 gpm pump I consider using one of those garden hose "sweep"
nozzels. I have an all brass one, one piece, approximately 3/8" inside
diameter necking down to a bit over 3/16" (or build your own) Your pump is
higher pressure, I'd shink the outlet to around 1/8" to max out the
capability of pump. You want max pressure and max volume. Make a couple,
cut the end off until the performance drops, cut a fresh one to the
optimum length.

With only 10 gm, I'd guess that you don't want much over 1-1/2" pipe as
your outlet in the orifice area. Smaller diameter will give you higher
outlet pressure. How much head do you need? It works better if the
pressure blast goes directly down the center of the output tube. A
somewhat longer outlet tube (perhaps 10x the diameter) should help couple
your high pressure blast to the inlet water.