Estimating parameters by solving Van Genuchen equation using the damper least square method

Soil water parameter is important to quantitatively forecast unsaturated water transport. Using damper least square method, Van Genuchten equation parameters of soil water characteristics were fitted. Compared with the simplex evolutionary method, damper least square method had a better fitting precision and was considered as a suitable method to calculate Van Genuchten equation parameters. The algorithm was coded by means of Visual Basic and it was convenient to modify input data.