(Sr) | Residual saturation defined ad hoc by Brooks & Corey, 1964 as given in [16] | [1] |
(t) | Time elapsed | [T] |
(tf) | Time at the final stage of percolation | [T] |
(T), (Ti) | Temperature, (i) denotes the initial phase | [Θ] |
(ti) | Time at the initial stage of percolation | [T] |
(tp) | Time at the beginning of the ponding stage of percolation | [T] |
(z) | Percolation depth (vertical)/wetting front/heat transfer length (vertical)/membranes penetration depth | [L] |
(V) | Water volume | [L3] |
(Vs) | Volume of the bulk soil or massive soil (control volume) | [L3]] |
(vz) | Vertical percolation velocity defined as the percolation that occurs in the vertical direction | [L∙T−1] |
(z) | Vertical distance/penetration depth/wetting depth/penetration depth at saturation state | [L] |