If the degree of saturation and water content for the partially saturated soil mass is 80% and 20% respectively, Porosity of the soil sample will be:
1
\({\rm{\eta }} = \frac{{\rm{G}}}{{{\rm{G}} + 4}}\)
2
\({\rm{\eta }} = \frac{{\rm{G}}}{{{\rm{G}} - 4}}\)
3
\({\rm{\eta }} = \frac{{\rm{G}}}{4}\)
4
\({\rm{\eta }} = \frac{4}{{{\rm{G}} - 4}}\)