Haverkamp Model

For h < 0:

s_e = 1 / (1 + (h/alpha)^beta)

Kr = 1 / (1 + (h/A')^B')

For h >= 0:

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

alpha = pressure head at which s_e = 0.5

beta = slope of the log-log plot of (1/s_e - 1) versus h

A' = pressure head at which Kr = 0.5

B' = slope of the log-log plot of (1/Kr - 1) versus h

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