Chapuis (2003) 
The Chapuis prediction uses the KozenyCarman (1989) equation to estimate a saturated hydraulic conductivity.
Void Ratio: The Void ratio field shows the void ratio of the soil.
D10: The Diameter corresponding to the 10% passing.
Chapuis ksat: Saturated hydraulic conductivity as estimated by the KozenyCarman (1989) equation (m/s).
