Civil Engineering MCQAE Level Civil Engineering
In a falling head permeability test, the coefficient of permeability k is given by:
Soil MechanicsPermeability Falling HeadMEDIUM
Choose the correct answer
A
k = aL/(At) × ln(h₁/h₂)
B
k = Q×L/(A×h×t)
C
k = iA/Q
D
k = v/i
Correct Answer
A. k = aL/(At) × ln(h₁/h₂)
Why is this the answer?
Falling head test: k = (a×L)/(A×t) × ln(h₁/h₂) = (a×L)/(A×t) × 2.303×log(h₁/h₂), where a = area of standpipe, A = area of sample, L = length of sample, h₁ = initial head, h₂ = final head, t = time elapsed.
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