Question

Which of the following is not an assumption of Theis equation?

• A. constant discharge of water
• B. homogeneous and isotropic soil
• C. partially penetrating well
• D. water released immediately from aquifer storage

Hint:

Theis assumes a fully penetrating well — partial penetration introduces vertical flow, which the model doesn’t account for.

Answer 1

The Correct Option is C

The Theis equation assumes:
- Constant pumping rate
- Homogeneous, isotropic, confined aquifer
- Instantaneous release from storage
- Fully penetrating well
Thus, partially penetrating well is not a valid assumption under the Theis model.