Question

A silty-clay deposit 4 m thick lies between two layers of sand as shown below. If the coefficient of permeability of clay is $1\times {10}^{-6}cm/sec$ then the seepage through the clay is

• A. $4\times {10}^{-8}{m}^3/sec/m^2$
• B. $1.4\times {10}^{-8}{m}^3/sec/m^2$
• C. $0.67\times {10}^{-8}{m}^3/sec/m^2$
• D. $1.5\times {10}^{-8}{m}^3/sec/m^2$

Answer 1

The correct option is D $1.5\times {10}^{-8}{m}^3/sec/m^2$

Head causing the flow = 6 m
$Q=k.i.A=1\times {10}^{-6}\times {10}^{-2}\times \frac{6}{4}\times 1m^3/sec/m^2$
$=1.5\times {10}^{-8}{m}^3/sec/m^2$