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Drilled - Drilled wells are the most common and are either shallow (25 feet or less) or deep (more than 25 feet). Well pumps typically cannot lift water higher than 34 ’, and because air may be introduced by leaks or design, and the altitude of t he pumping site above sea level creates limits, shallow wells are limited
to 25’. When wells are deeper than 25’,
a venturi is a necessary part of the ejector and lift pipe. Some of the
water from the pump is diverted through the venturi, which creates a
low-pressure zone. The well water that enters the low-pressure zone and
the velocity of the water coming through the venturi nozzle pushes it
upward, where it is captured and lifted by suction to the pressure/storage
tank. The presence of the venturi gives the pump the ability to lift water
hundreds of feet.
If a jet pump (not a submersible pump) is present in the basement or crawl space, and it has one pipe, it is a shallow well. If there are two pipes, it has a venturi that will allow it to draw the water up from deeper wells. Submersible pumps are located in the well, near the bottom of the drilling. Dug - Dug wells are open bodies of water, normally 2 to 3 feet in diameter. Dug wells are not allowed any more due to their vulnerability to pollution from surface sources. General
Pumps Storage/Pressure
Tanks Well Operability and
Equipment Well Production
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Driven - A driven well is a pipe with a special
point that is driven into the ground to a source of water.
Driven wells are normally less than 25 feet deep, although they can be
as deep as 100 feet. Driven wells are limited to areas of sandy,
rock-free soils that allow the pipe to be driven without significant
interference.