Identify given parameters

List the given geotechnical properties: void ratio $e = 0.60$, water content $w = 0.18$, and specific gravity of solids $G_s = 2.6$.

$e = 0.60, w = 0.18, G_s = 2.6$

Select the governing relation

Use the fundamental phase relationship in soil mechanics that links saturation, void ratio, water content, and specific gravity.

$S \times e = w \times G_s$

Substitute values

Substitute the known values into the equation to solve for the degree of saturation $S$.

$S \times 0.60 = 0.18 \times 2.6$

Calculate the result

Perform the arithmetic: $S = \frac{0.18 \times 2.6}{0.60} = \frac{0.468}{0.60} = 0.78$. Convert the decimal to percentage by multiplying by 100.

$S = 0.78 \times 100 = 78\%$