What is static water level, and how does it differ from drawdown during pumping?

What is static water level, and how does it differ from drawdown during pumping?

• A. Static water level is the water level during pumping; drawdown is the natural level when not pumping.
• B. Static water level is the water level at the surface; drawdown is the difference between surface and water table.
• C. Static water level is the temperature of groundwater; drawdown is hydraulic pressure drop.
• D. Static water level is the natural groundwater level when not pumping; drawdown is the decline in water level caused by pumping.

Answer: (D)