We get water from aquifers through the use of wells. If a well is drilled in the right location in an artesian aquifer, the pressure will cause it to flow on its own.

In the picture to the left, the well on the right side flows on its own, while the well on the left side does not.

Usually, mechanical energy must be used to extract the ground water, as with the hand pump shown here. Most modern wells use another energy source to pump the water, such as electricity.