I am grateful to Masciopinto (2012) for raising several issues from my study (Nimmo, 2010) that deserve elaboration or clarification. In this reply, I address these in what I judge to be the order of importance, the main ones being (i) the discrepancy of scales between the two domains that treat preferential and diffuse unsaturated flow, and (ii) the properties that must be evaluated to characterize the medium.

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On the issue of scales, Masciopinto is correct in pointing out that the two domains of the source-responsive flux model (S for source responsive and D for diffuse) have different...

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