Value

Meaning

Not Estimated

Soil evaporation is not accounted for.

PM-eq, Rs(1Par)

Soil evaporation is calculated using the Penman-Monteith equation and a simple function for the surface resistance of the soil using an estimated surface storage and one governing parameter.

PM-eq, Rs(3Par)

Soil evaporation is calculated using the Penman-Monteith equation and a simple function for the surface resistance of the soil using an estimated surface storage and three governing parameters.

Iterative Energy Balance

Soil evaporation is derived from an iterative solution of the soil surface energy balance of the soil surface, using an empirical parameter for estimating the vapour pressure and temperature at the soil surface.

K-function

Soil evaporation is simply taken as the minimum value of the flow rate that could be supplied from the middle point of the uppermost soil layer to the soil surface and the potential rate as calculated by the Penman-Monteith equation with surface resistance set to zero.