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Reply to comment by V. P. Shkilev on “Non‐Fickian transport and multiple‐rate mass transfer in porous media”

[1] The comment by Shkilev [2010] focuses on the derivation and interpretation of the transport equations that we developed in our work [Berkowitz et al., 2008]. We are pleased to be able to further expand upon this aspect of our paper. [2] In our work [Berkowitz et al., 2008], we begin with a conceptual picture that accounts for mechanisms capable of generating the broad spectrum of transition rates needed to cause non‐Fickian transport. We specialize these transition rates into two categories—“fast” and “slow”—of time spectra. The fast spectrum is associated with the complex flow field of a highly heterogeneous medium, and the slow one results from the mass exchange between this “mobile” phase and a distribution of “immobile” states. In this reply, we show that the equations based on this physical picture are self‐consistent and derivable, and we provide further discussion on their interpretation and application.