soilwater-package       soilwater: Implements parametric formulas for
                        soil water retention or conductivity curve
swc                     Soil water Retantion Curve and Unsaturated
                        Hydraulic Conductivity
watervolume             Water volume in function of water-table depth
                        or height 'swc', Hydraulic Conductivity 'khy' ,
                        Soil Water Capacity 'cap' , Soil Water
                        (Hydraulic) Diffusivity 'diffusivity'
