Campbell (1974)

θ_s, α, λ

Tani (1982)

θ_r, θ_s, α,

Exponential

θ_r, θ_s, α,

van Genuchten (1980)

θ_r, θ_s, α, n

Gardner (1958)

θ_r, θ_s, α, n

Ruso

θ_r, θ_s, α, n

Brooks-Corey (1964)

θ_r, θ_s, α, λ

Kosugi (1999)

θ_r, θ_s, σ, h_m

Fredlund-Xing (1994)

θ_r, θ_s, α, n, m

v an Genuchten (1980)

θ_r, θ_s, α, n, m

Biexponential (Omuto, 2009)

α₁, α₂, θ_r,