128 A clean uniform sand has 10 passing 300 m No 50 sieve Es

1-28. A clean, uniform sand has 10% passing 300 m (No. 50) sieve. Estimate the coefficient of permeability

Solution

k = 100 x (D₁₀)² cm/s

Where D₁₀ = Particle size for which 10% soil is finer (in cm.)

So, k = 100 x (.03)²

k = 0.09 cm/s (ANS)