Submersible pumps for wells are important equipment for deep well water extraction. When in use, the entire unit submerges into the water to extract groundwater to the surface. Simply put, it means lifting a certain weight of groundwater from underground to a location...

 on the surface where water is needed. The volume of groundwater lifted per unit time is the flow rate, and the height lifted to the surface is the head (which should be considered the main part of the head, including pipeline resistance and outlet pressure requirements, and will not be discussed in detail here).