What is the term for the difference between static level and pumping level of a well?

The term that describes the difference between the static level and the pumping level of a well is drawdown. This concept is crucial for understanding well performance and groundwater extraction. When water is pumped from a well, the water level within the well drops from its static level (the level of water prior to any pumping) to a lower level called the pumping level.

Drawdown is an important measure because it indicates how much water is being removed from the aquifer and can affect the well's ability to provide a consistent supply of water. Monitoring drawdown helps operators assess the health of the well and manage groundwater resources sustainably.

In the context of well hydraulics, drawdown provides vital information about aquifer characteristics, well efficiency, and potential impacts on neighboring wells. Understanding this concept assists water operators in making informed decisions about well operations and maintenance.