Groundwater Wells and Pumps

Dupuit-Thiem formula for steady radial flow to a fully penetrating well in an unconfined aquifer is:

Options:

• (A) $Q = \frac{\pi K (h_2^2 - h_1^2)}{\ln(r_2 / r_1)}$
• (B) $Q = \frac{2 \pi K b (h_2 - h_1)}{\ln(r_2 / r_1)}$
• (C) $Q = \frac{\pi K (h_2 - h_1)^2}{\ln(r_2 / r_1)}$
• (D) $Q = \frac{2 \pi K (h_2^2 - h_1^2)}{r_2 / r_1}$