Which two water levels define the drawdown in a pumped well?

Which two water levels define the drawdown in a pumped well?

• A. Static level and pumping level
• B. Ground surface and water table
• C. Pumping level and aquifer bottom
• D. Static level and surface water

Answer: (A)

Drawdown is the amount the water level in a pumped well falls from its undisturbed level. The undisturbed level is the static level—the water height in the well when nothing is being pumped. When pumping begins, the water level drops to the pumping level—the level observed while the pump is running. The difference between these two levels is the drawdown. This definition focuses on the change inside the well due to pumping, not on surface features or the bottom of the aquifer.

Drawdown is the amount the water level in a pumped well falls from its undisturbed level. The undisturbed level is the static level—the water height in the well when nothing is being pumped. When pumping begins, the water level drops to the pumping level—the level observed while the pump is running. The difference between these two levels is the drawdown. This definition focuses on the change inside the well due to pumping, not on surface features or the bottom of the aquifer.