alleryStart learning →Coefficient of permeability (k) of clean sand is approximately:
A10⁻¹⁰ m/s
B10⁻³ to 10⁻⁵ m/s
C100 m/s
DZero
Answer & Solution
Correct answer: B. 10⁻³ to 10⁻⁵ m/s
**Permeability k:** water-flow rate per unit gradient. Gravel: 10⁻¹–10⁻³. Sand: 10⁻³–10⁻⁵. Silt: 10⁻⁵–10⁻⁷. Clay: 10⁻⁹–10⁻¹¹ m/s.
Several orders of magnitude.
**Determined by Darcy's law:** q = k × i × A.
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