Steady Flow to Wells: Confined & Unconfined Aquifers

Dupuit's steady-state discharge equation for a fully penetrating well in an unconfined aquifer between radial distances $r_1$ and $r_2$ with phreatic heights $h_1$ and $h_2$ 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) $Q = \frac{2 \pi K (h_2^2 - h_1^2)}{\log_{10}(r_2 / r_1)}$