# Degree of Saturation

Written by Jerry Ratzlaff on . Posted in Geotechnical Engineering

Degree of saturation, abbreviated as S, a dimensionless number, is the ratio of volume of water to the volume of voids.

## Degree of Saturation formulas

 $$\large{ S = \frac{V_w}{V_v } \; 100 }$$ $$\large{ S = \frac{w \; SG_s }{ e } }$$

### Where:

 Units English Metric $$\large{ S }$$ = degree of saturation (expressed as %) $$\large{dimensionless}$$ $$\large{ SG_s }$$ = specific gravity of soil $$\large{dimensionless}$$ $$\large{ e }$$ = void ratio $$\large{dimensionless}$$ $$\large{ V_v }$$ = volume of voids (air and water) $$\large{ft^3}$$ $$\large{m^3}$$ $$\large{ V_w}$$ = volume of water $$\large{ft^3}$$ $$\large{m^3}$$