Well Hydraulics and Groundwater

In a Theis recovery test conducted after shutting down a pumping well that ran for duration $t$, the residual drawdown $s'$ at time $t'$ after shutdown is plotted against:

Options:

• (A) $\log_{10}(t / t')$, where $t$ is total time since pumping began ($t_{pumping} + t'$)
• (B) $\log_{10}(t')$
• (C) $t / t'$ on arithmetic scale
• (D) $1 / t'$