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Three soil specimens (Soil 1, Soil 2 and Soil 3), each 150 mm long and 100 mm in diameter, are placed in series in a constant head flow set-up as shown in the figure. Suitable screens are provided at the boundaries of the specimens to keep them intact. The coefficients of permeability of Soil 1, Soil 2 and Soil 3 are 0.01, 0.003 and 0.03 cm/s, respectively. The value of \(h\) in the set-up is
- 0 mm
- 40 mm
- 255 mm
- 560 mm
Correct answer: 40 mm
Solution
In a series flow system, the same discharge passes through each specimen, so the head loss across each layer is proportional to its flow resistance. Using the given permeabilities and equal lengths, the computed head difference \(h\) is 40 mm.
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