Well dewatering pump is an important equipment for deep well water extraction system. The whole unit submerged into water when the system being used,extracting groundwater from the earth’s surface simple words, to lift a certain amount of groundwater from underground to the place where water is needed on the ground,The amount of groundwater that is raised in unit time is what is called head,So, is the head of the underground pump calculated from installation position or the water level of the well? First of all, let’s know two nouns – hydrostatic and dynamic water level: Well water level is the surface elevation of the well.The water level has the static water level and the dynamic water level. Before start to pump the water level according to the static water level (i.e., the LS), start to pump, water pumping wells decreased with time, the change of the water level in the water level. That pump out the water is relatively stable, the water level reached a certain depth will stab...