infiltration            Cumulative infiltration and sqrt of time Using
                        time and volume from field spreadsheets, the
                        Cumulative infiltration and sqrt of time are
                        calculated
parameter_A             Calculates parameter A from (Philip, 1957)
vg_par                  Tabulated VG parameters Van Genuchten
                        parameters and values of A, n and alpha for the
                        Minidisk Infiltrometer (Decagon Devices, Inc.,
                        2005). 12 soil texture classes and suction from
                        0.5 to 7 cm are tabulated
vg_parameters_bytexture
                        van Genuchten parameters
