A soil has mass unit weight r, water content w (as ratio). The specific gravity of soil solids = G, unit weight of water = $r_{w}$ , 'S', the degree of saturation of the soil is given by

- 1
  
  $S = \frac{1 + w}{\frac{r_{w}}{r} (1 + w) - \frac{1}{G}}$
- 2
  
  $S = \frac{w}{\frac{r_{w}}{r} (1 + w) - \frac{1}{G}}$
- 3
  
  $S = \frac{(1 + w)}{\frac{r_{w}}{r} (1 + w) - \frac{1}{w G}}$
- 4
  
  $S = \frac{w}{\frac{r_{w}}{r} (1 + w) - \frac{1}{w G}}$

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