A shallow well pump is just what it says it is, a device that will pump water from a shallow well, or one that is no more than 25 feet deep. You can find shallow well pumps that you can operate by hand, or ones that are powered by an electricity supply including a generator.
If you have a well on your property, then this kind of pump will supply you with water for your house, or even your swimming pool. You can use one for irrigation purposes and to obtain water form a pond.
They don’t have any mechanical parts submersed in water, shallow well pump mechanism is connected to a (usually) plastic pipe. The pipe is the conduit, through which the water is pumped, and a valve ensures the water only flows in one direction; the water can’t go back to its source. The siphon-like function of the pump creates a vacuum and utilizes the surrounding atmospheric pressure to pump water.
You can use a shallow well pump to remove excess water from a drainage ditch, or a pond, or from any place where there is water that shouldn’t be there. They can help after heavy rainfall and allow you to get rid of any water you have no need for.