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How to calculate the head of dewatering pumps

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 stabilize the water surface elevation is no longer called stable water level drops usually said water level refers to the stable water level (or above – LD). The vertical height from the static water level to the water level drawdown depth of the pumping process called drawdown or drawdown (i.e. above – S).
Then, according to the height difference between the water level of the well and the height of the ground when the pump works, it should be based on the dynamic water level (that is, the top of the image – LD) as the lift.
If the installation position of the pump as the head will be too large, the first cause of equipment procurement cost waste: pump to buy large, pipeline cable to lengthen, operation and electricity; also caused by the pump operation is large, flow overload, easy to cause motor burnout
If the static water level is chosen as the head, the head will be too low, the water will not be enough or the water will not be pumped at all.
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