Total drawdown $(s_w)$ observed inside a pumping well consists of two primary components: linear head losses due to laminar aquifer flow, and non-linear head losses caused by turbulent friction near the well screen and pump intake. Jacob’s Well Loss Equation quantifies this relationship: $s_w = B \cdot Q + C \cdot Q^2$ Where $Q$ is discharge, $B$ is the aquifer loss coefficient $(B = B_{aquifer} + B_{well, linear})$, and $C$ is the non-linear well loss coefficient. Parameters $B$ and $C$ are determined by performing a Step-Drawdown Test, where the well is pumped at increasing discharge steps $(Q_1, Q_2, Q_3, \dots)$. Plotting specific drawdown $(s_w / Q)$ against discharge $(Q)$ yields a straight line with slope $C$ and intercept $B:$ $\frac{s_w}{Q} = B + C \cdot Q$ Well efficiency $(\eta_w)$ is defined as the ratio of formation loss to total drawdown: $\eta_w = \frac{B \cdot Q}{s_w} \times 100\%.$ In deep alluvial and hard-rock irrigation tubewells across Northern and Central...