Civil Engineering MCQJE Level Civil Engineering
Darcy''s law for flow through saturated soil states that seepage velocity v is:
Soil MechanicsSoil MechanicsEASY
Choose the correct answer
A
v = k/i
B
v = k·i (velocity proportional to hydraulic gradient)
C
v = k·i²
D
v = i/k
Correct Answer
B. v = k·i (velocity proportional to hydraulic gradient)
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Darcy''s law: v = k·i where k = coefficient of permeability (m/s or cm/s), i = hydraulic gradient = Δh/L. Valid for laminar flow (Re < 1 for soil). Actual seepage velocity = v/n (n = porosity). k depends on soil type: gravel k = 10⁻² m/s; clay k = 10⁻⁹ m/s.
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