Beyer (1964) ksat 
The Beyer prediction uses the Beyer (1964) equation to estimate the saturated hydraulic conductivity.
D60: D60 is the diameter of the 60% passing particlesize (mm).
D10: D10 is the diameter of the 10% passing particlesize (mm).
De: De is the effective grain diameter with 10% coverage on the grainsize distribution curve (mm).
Beyer Ksat: Beyer (1964) ksat refers to the saturated coefficient of permeability (m/s).
