What is a drawdown?

• A. A drop in the water table due to water being pumped out of a well
• B. A rise in the water table due to rainfall
• C. No change in water table
• D. A temporary fluctuation in water level due to weather

Answer: (A)

Drawdown describes the drop in the groundwater level caused by pumping water from a well. When water is withdrawn, the hydraulic head near the well falls, creating a cone of depression around it and lowering the water table (or potentiometric surface) from its static level. The amount of drawdown is the difference between the static water level before pumping and the level during pumping (or after pumping when flow is occurring). Factors like pumping rate, aquifer transmissivity, and storativity influence how much the level declines and how quickly it occurs, and recovery happens after pumping stops as water recharges the area.

The other scenarios aren’t about pumping effects: a rise in the water table from rainfall is natural recharge, not drawdown; no change means no pumping or no net effect; and a short-term fluctuation due to weather describes transient variability, not the sustained lowering caused by extraction.