Difference between cumulative water injection $\begin{array}{l}Q_w^{\downarrow}\end{array}$ and cumulative water production $\begin{array}{l}Q_w^{\uparrow}\end{array}$ normalized on to the pore volume $\begin{array}{l}V_phi\end{array}$ :

$\begin{array}{l}\displaystyle NWR = (Q_w^{\downarrow} - Q_w^{\uparrow} ) / V_phi\end{array}$

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Normalized Water Replenishment = NWR

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