| symbol | explain |
| K | Permeability coefficient |
| H | Head of water |
| W | Vertical flow per unit volume |
| Ss | Elastic water release (storage) rate of porous media |
| T | Time |
| H0 (x, y, z) | The initial water head value of the aquifer in the simulation area |
| H1 (x, y, z, t) | The actual measured water head values at the first boundary of each layer in the simulation area |
| q (x, y, z, t) | The flow per unit area on the second boundary of each layer in the simulation area |
| ε | Phreatic evaporation intensity |
| ε0 | Evaporation of 20 mm diameter pan during the same period |
| β | surface evaporation conversion coefficient, 0.55 |
| λ | Submersible evaporation coefficient |