The Nimmo (2010) source-responsive (SR) model has the very ambitious scope of determining the wetting front in a soil as caused by fast vertical water infiltration. This infiltration overcomes the shallow zone of the soil column and increases the water content at a certain depth from the top to a value that is higher than expected.

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I agree with the comments of Germann (2010) and I believe that the Stokes principles and their applications to preferential flow have not yet been fully explored. Furthermore, innovative theories must be able to withstand very careful scrutiny. For this, Nimmo is to be...

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