Use Fredlund and Xing as hydraulic model

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Use Fredlund and Xing as hydraulic model

Post by Sasan » Mon Sep 30, 2019 2:17 pm


My intention is to use Fredlund and Xing 1994 equation as hydraulic model. The model has not been listed among available models in Hydrus. Is there any possibility to add Fredlund and Xing model to the HYdrus? Thank you.

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Location: USA
Location: Riverside, CA

Re: Use Fredlund and Xing as hydraulic model

Post by Jirka » Mon Sep 30, 2019 7:03 pm

PC-Progress could implement this function(s) into the computational module as a paid service. However, please note that having the analytical function for the retention curve is not sufficient to use HYDRUS to simulate water flow. You also need to have definitions of the capacity function (a derivative of the retention function) and the unsaturated hydraulic conductivity function.

The simplest option seems to be to generate and use the look-up tables, which would not require any modification of the code. You would simply define your functions using the look-up tables at the input.


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