ionships <span class="math notranslate nohighlight">\(K_{r}(\Psi)\)</span> and  <span class="math notranslate nohighlight">\(S_{w}(\Psi)\)</span> are specified using either van Genuchten and Nielsen [1985], Brooks and Corey [1964], or Huyakorn et al. [1984] expression. Linearization via Newton or Picard iteration is used in the solution procedure.</p>
</section>

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