If you know the pumping level and the drawdown, what is the method to find the static level?

To determine the static water level when you have the pumping level and the drawdown, the correct approach is to subtract the drawdown from the pumping level.

The pumping level is the measurement of the water level in the well when water is actively being pumped out. Drawdown refers to the difference in water level before and during pumping; it indicates how far the water level has dropped due to the pumping action. By subtracting the drawdown from the pumping level, you can accurately calculate the static water level, which is the natural level of groundwater when it is not being influenced by the pumping process.

This relationship is essential for understanding well performance and groundwater resource management. It is important to accurately ascertain the static level, as it helps in evaluating the available yield of the well and in determining the sustainability of the groundwater extraction.