Mathematics · Permeability and Averages
A horizontal stratified soil deposit consists of three uniform layers whose thicknesses are 6 m, 3 m, and 12 m respectively. The permeabilities of the layers are 4 × 10-4 mm/s, 25 × 10-4 mm/s, and 7.5 × 10-4 mm/s. Find the effective average permeability in the horizontal direction.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 19 × 10-4 mm/s✓
- 20.9 × 10-4 mm/s
- 36 × 10-4 mm/s
- 47 × 10-4 mm/s
Correct answer
9 × 10-4 mm/s
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