Groundwater Wells and Pumps

Thiem's equilibrium formula for steady radial flow to a fully penetrating well in a confined aquifer is:

Options:

• (A) $Q = \frac{2 \pi T (s_1 - s_2)}{\ln(r_2 / r_1)}$
• (B) $Q = \frac{\pi K (h_2^2 - h_1^2)}{\ln(r_2 / r_1)}$
• (C) $Q = \frac{2 \pi K (s_1 - s_2)}{r_2 - r_1}$
• (D) $Q = 2 \pi T \ln(r_2 / r_1)$