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Shallow Well Pumps

These days, the most common pump for a shallow well is a jet pump. Jet pumps are
mounted above the well, either in the home or in a well house, and draw the water up from
the well through suction (see Single-Drop Jet-Pump System diagram on next page).
Because suction is involved, atmospheric pressure is what's really doing the work. Think of
the system as a long straw. As you suck on the straw, you create a vacuum in the straw
above the water. Once the vacuum is there, the weight of the air, or atmospheric pressure,
pushes the water up the straw. Consequently, the height that you can lift the water with a
shallow-well jet pump relates to the weight of the air. While air pressure varies with
elevation, it's common to limit the depth of a jet-pump-operated shallow well to about 25 ft.

Typical Shallow Well Systems:

Deep Well Pumps

Unfortunately, you may have to go a little
deeper than 25 ft. for your water.
Surprisingly, you can still do it with a jet
pump. It simply involves separating the jet
placing the jet assembly down in the water
(see Double-Drop Jet-Pump System
diagram). In a typical deep-well jet-pump
configuration, one pipe mounted to the
impeller housing drives water down into the
jet body that's located about 10 to 20 ft.
below the minimum well water level. A
second pipe connects the output side of the
jet body back to the pump.
At the jet, the increase in water velocity
creates the partial vacuum that draws
standing well water into the second pipe and
then back into the pump and plumbing
system. Deep-well jet pumps use both the
suction at the jet to bring water into the
system and pressure applied by the impeller
to lift the water.
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