net.simplace.usermodules.roelof.EquationsFAO56

protected double K_s(double p, double D_r, double TAW);

Calculate water stress factor K_s according to FAO56, Ch. 8 (Eq. 83 & 84.).

• p Depletion factor
• D_r Root zone depletion (FC - retained above WP) [mm]
• TAW Total available water in the root zone [mm]

protected double K_r(double D_e, double TEW, double REW);

Calculates evaporation reduction factor K_r according to FAO56, Ch. 7. Note: Allen et al (1998) explicitly specifies K_r = 1 when soil surface is wet, which is also the case here, as when WM > 0, WR = FC, and therefore D_e will be zero.

• D_e Evaporation zone depletion (FC - retained above 0.5*WP) [mm]
• TEW Total evaporable water (i.e., maximum depth of water that can be evaporated from the soil surface layer) [mm]
• REW Readily evaporable water: depletion at which evaporation starts to become limited [mm]