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Degree of Saturation from Water Content

Mediumphase relationshipssaturation
A soil has water content w = 18%, specific gravity of solids Gs = 2.70, and void ratio e = 0.65. Its degree of saturation is most nearly:
  1. A48%
  2. B63%
  3. C75%
  4. D92%
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Answer: C. 75%

The phase relationship Se = wGs gives S = wGs/e = (0.18)(2.70)/0.65 = 0.486/0.65 ≈ 75%. The soil is partly saturated, so roughly three quarters of the void space holds water and the rest is air.
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