Brooks-Corey Model

For h < h _b :

s_e = (h / h _b ) ^(-lambda)

Kr = (h / h _b ) ^{(-2-3*lambda)}

For h >= h _b :

s_e = 1

Kr = 1

where

s_e = effective saturation = (VMC - RMC)/(porosity - RMC)

• VMC = volumetric moisture content
• RMC = residual moisture content

Kr = relative hydraulic conductivity

h = pressure head

h _b = bubbling or air entry pressure head

lambda = pore size distribution index

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