A property characterising agility of the water under pressure gradient with account of relative permeability and dynamic fluid viscosity:

(1)	$\begin{array}{l}\displaystyle M_{rw}(s) = \frac{k_{rw}}{\mu_w}\end{array}$

where

$\begin{array}{l}k_{rw}(s)\end{array}$	relative formation permeability to water
$\begin{array}{l}\mu_w\end{array}$	dynamic viscosity of water
$\begin{array}{l}s\end{array}$	reservoir saturation $\begin{array}{l}\sum_\alpha s_{\alpha} = 1\end{array}$

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