If the pumping rate is increased, what happens to the cone of depression?

If the pumping rate is increased, what happens to the cone of depression?

• A. Decrease the drawdown
• B. Decrease the radius of the influence
• C. Lower the pumping level
• D. Raise the pumping level

Answer: (C)

Increasing the pumping rate causes more water to be removed from the aquifer, so the water level near the well falls further. This makes the cone of depression deeper, and the water surface inside the well—the pumping level—drops. So the correct idea is that the pumping level lowers as you pump more. The other ideas don’t fit: pumping more water does not reduce the drawdown or the radius of influence; it typically increases both the drawdown and the region affected. It certainly doesn’t raise the pumping level, since pumping removes water and lowers the level.

Increasing the pumping rate causes more water to be removed from the aquifer, so the water level near the well falls further. This makes the cone of depression deeper, and the water surface inside the well—the pumping level—drops. So the correct idea is that the pumping level lowers as you pump more.

The other ideas don’t fit: pumping more water does not reduce the drawdown or the radius of influence; it typically increases both the drawdown and the region affected. It certainly doesn’t raise the pumping level, since pumping removes water and lowers the level.