Table 1 RRI model configuration used in the study

Manning’s roughness on slope cell

\({n}_{s}\)

–

0.4

0.15

0.015

Soil surface porosity

\({\varphi }_{a}\)

–

0.6

0.6

0.6

Vertical hydraulic conductivity

\({K}_{v}\)

cm/s

–

–

0.06

Suction at the wetting front

\({S}_{f}\)

m

–

–

0.273

Lateral hydraulic conductivity

\({K}_{a}\)

m/s

0.25

0.25

–

Unsaturated porosity

\({\varphi }_{m}\)

–

0.6

0.6

–

Coefficient of unsaturated hydraulic conductivity

\(\beta\)

–

4.0

4.0

–