Wells and Pumps

In a confined artesian aquifer of thickness $b$ and hydraulic conductivity $K$, the discharge to a fully penetrating pumping well is given by the Thiem equilibrium formula as:

Options:

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